US Pat. No. 9,388,317

INK FORMULATIONS FOR IMPROVING PRINTHEAD LIFETIME

Memjet Technology Limited...

1. An inkjet ink comprising:
(i) a disazo dye of formula (I):

wherein:
A is a C6-14 aryl group having 0, 1, 2, 3, 4 or 5 substituents selected from the group consisting of: —SO3M, nitro, carboxyl, halogen, hydroxyl, amino, C1-4 alkylamino, C1-4 alkoxy, C1-4 alkyl, C1-4 haloalkyl, cyano, sulfonamide, carbamoyl, C1-4 alkylamido and C1-4 alkoxycarbonyl;

B is a C6-14 aryl group having 0, 1, 2, 3, 4 or 5 substituents selected from the group consisting of: —SO3M, nitro, carboxyl, halogen, hydroxyl, amino, C1-4 alkylamino, C1-4 alkoxy, C1-4 alkyl, C1-4 haloalkyl, cyano, sulfonamide, carbamoyl, C1-4 alkylamido and C1-4 alkoxycarbonyl;

each M is independently selected from the group consisting of: hydrogen, lithium, sodium, potassium, ammonium and quaternary
ammonium; and

the dye of formula (I) comprises at least 3 groups of formula —SO3M;

(ii) sulfolane;
(iii) a glycol compound selected from the group consisting of: ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene
glycol and pentaethylene glycol; and

(iv) water.

US Pat. No. 9,283,756

INKJET NOZZLE DEVICE HAVING CHAMBER GEOMETRY CONFIGURED FOR CONSTRAINED SYMMETRIC BUBBLE EXPANSION

Memjet Technology Limited...

1. An inkjet nozzle device configured for constrained symmetric bubble expansion, the inkjet nozzle device comprising a firing
chamber having a nozzle aperture and a heater element, the heater element extending at least partially between an end wall
of the firing chamber and a baffle plate facing the end wall, wherein the baffle plate is wider than the heater element and
a centroid of the heater element coincides with a midpoint between the baffle plate and the end wall.

US Pat. No. 9,315,028

METHOD OF WIPING PAGEWIDTH PRINTHEAD

Memjet Technology Limited...

1. A method of maintaining a pagewidth inkjet printhead, the method comprising the steps of:
providing a supply of an absorbent web of material at one side of the printhead, the web having a width corresponding substantially
to a length of the printhead, the supply comprising a roller having a rotation axis extending parallel with the printhead
and perpendicular to the media feed direction;

increasing a gap between the printhead and a platen positioned below the printhead; and
moving a maintenance portion of the absorbent web transversely across the printhead in a direction parallel to the media feed
direction,

wherein the roller is positioned relatively higher than the printhead during printing.

US Pat. No. 9,302,507

METHOD OF TRANSPORTING PRINT MEDIUM IN A PRINTER

Memjet Technology Limited...

1. A printer comprising a vacuum belt assembly for moving print media in a media feed direction along a media path, the vacuum
belt assembly comprising:
a plurality of spaced apart endless belts tensioned between first and second pulleys;
a vacuum chamber for drawing print media onto an upper surface of the belts; and
a plurality of vacuum antechambers communicating with the vacuum chamber, each vacuum antechamber having a perimeter opening
for suction engagement with print media, wherein the vacuum antechambers are together configured to provide greater suction
at an upstream side of the belts relative to a downstream side of the belts, the upstream and downstream sides being defined
relative to the media feed direction.

US Pat. No. 9,409,419

PRINTER WITH VACUUM BELT ASSEMBLY HAVING INDEPENDENTLY LATERALLY MOVABLE BELTS

Memjet Technology Limited...

1. A printer comprising a vacuum belt assembly for moving print media in a media feed direction along a media path, the vacuum
belt assembly comprising:
a plurality of endless belts tensioned between first and second pulleys, the first and second pulleys having respective first
and second axes of rotation perpendicular to the media feed direction; and

a vacuum chamber for drawing print media onto an upper surface of the belts, wherein:
the second pulley is downstream of the first pulley with respect to the media feed direction;
the second pulley is configured to allow a predetermined degree of independent lateral sliding of each belt along the second
axis; and

the first pulley is configured to prevent any lateral movement of the belt along the first axis.

US Pat. No. 9,283,764

MODULAR PRINTER INCLUDING PRINTER MODULES WITH MAINTENANCE SLEDS MOVING IN OPPOSITE DIRECTIONS

Memjet Technology Limited...

1. A modular printer comprising:
a media feed path defining a media feed direction;
a plurality of printer modules positioned in a staggered overlapping arrangement so as to extend across a width of the media
feed path,

wherein:
each printer module comprises a printhead and a respective maintenance sled for slidably moving towards the printhead in a
direction parallel to the media feed direction;

the maintenance sleds for neighboring printer modules are configured to move in opposite directions towards their respective
printheads.

US Pat. No. 9,834,694

METHOD OF PRINTING PIGMENT-BASED INKS INCLUDING INK SETS, INKS AND PRINTERS THEREFOR

MEMJET TECHNOLOGY LIMITED...

1. A method of inkjet printing comprising the steps of:
printing a first ink onto a print medium, the first ink comprising a first self-dispersible pigment in an amount A in terms
of a wt. % of the first ink; and

subsequently printing a second ink onto the print medium at least partially over the first ink, the second ink comprising
a second pigment in an amount B, in terms of a wt. % of the second ink, and a polymeric dispersant encapsulating the second
pigment;
wherein:
the first self-dispersible pigment and the second pigment have a same color;
the amount A of the first pigment and the amount B of the second pigment have a relationship 0.8?A/B?1.2;
a polymer acid value of the polymeric dispersant is in the range of 100 to 170 KOH mg/g; and
a weight-average molecular weight of the polymeric dispersant is in the range of 20,000 to 200,000.

US Pat. No. 9,434,156

METHOD OF INKJET PRINTING AND MAINTAINING NOZZLE HYDRATION

Memjet Technology Limited...

1. A method of printing from a fixed inkjet printhead having a plurality of ink planes, the method comprising the steps of:
feeding a print medium past the printhead in a media feed direction, the media feed direction defining relative upstream and
downstream sides of the printhead;

printing an image onto the print medium, the image being defined by image data; and
printing first and second keep-wet patterns onto the print medium from respective first and second ink planes of the printhead,
the keep-wet patterns being defined by a plurality of dots printed at a frequency sufficient to maintain hydration of each
nozzle in the printhead,
wherein the first keep-wet pattern from the first ink plane is printed at a higher frequency than the second keep-wet pattern
from the second ink plane, the first ink plane being furthest upstream in the printhead and in a relatively more dehydrating
local environment than the second ink plane, and wherein a distance between neighboring ink planes in the printhead is in
the range of 20 to 1000 microns.

US Pat. No. 9,289,986

INKJET NOZZLE DEVICE CONFIGURED FOR MINIMIZING SATELLITE DROPLETS

Memjet Technology Limited...

1. An inkjet nozzle device comprising:
a firing chamber having a nozzle aperture defined in a roof thereof; and
a heating element for generating gas bubbles in the firing chamber so as to eject ink through the nozzle aperture,wherein a non-heating stabilizing bar extends continuously across the nozzle aperture, the stabilizing bar being coplanar
with the roof of the firing chamber and having a same thickness as the roof.

US Pat. No. 9,597,880

INKJET PRINTER HAVING INK DISTRIBUTION STACK FOR RECEIVING INK FROM INK DUCTING STRUCTURE

Memjet Technology Limited...

1. An inkjet printer comprising:
a plurality of ink reservoirs, each ink reservoir containing a different colored ink; and
a printhead assembly in fluid communication with the ink reservoirs, the printhead assembly comprising:
an ink ducting structure including a plurality of first ducts extending substantially along a length thereof, each ink reservoir
being in fluid communication with a respective one of the first ducts; and

an ink distribution stack having three ink distribution layers, the ink distribution stack receiving, in an uppermost inlet
layer, each of the different colored inks from the ink ducting structure and distributing the different colored inks to each
of a plurality of printhead chips,

wherein the uppermost inlet layer has a plurality of ink inlet holes in fluid communication with the first ducts via a plurality
of second ducts defined in the ink ducting structure, the second ducts being non-parallel with the first ducts and serving
to duct the different inks from the relatively widely spaced first ducts to the relatively narrowly spaced ink inlet holes.

US Pat. No. 9,550,359

INKJET NOZZLE DEVICE WITH ROOF ACTUATOR CONNECTED TO LATERAL DRIVE CIRCUITRY

Memjet Technology Limited...

1. An inkjet printhead integrated circuit comprising:
a substrate having at least one silicon layer;
a nozzle plate disposed on the silicon layer; and
one or more embedded inkjet nozzle devices, each inkjet nozzle device comprising:
a nozzle chamber defined in the silicon layer, each nozzle chamber comprising a floor having a chamber inlet defined therein;
a roof comprising a thermal bend actuator, the thermal bend actuator having a thermoelastic material layer disposed on a passive
layer and being configured for ejecting ink through a nozzle opening defined in the roof; and silicon sidewalls extending
from the floor to the roof;

drive circuitry laterally disposed relative to the nozzle chamber;
one or more connection arms extending parallel with the nozzle plate, each connection arm comprising the thermoelastic material
layer extending towards the drive circuitry; and

at least one metal via interconnecting each connection arm and the drive circuitry, each metal via extending perpendicularly
to the nozzle plate, wherein the drive circuitry is positioned relatively closer to the nozzle plate than to a plane of the
floor.

US Pat. No. 9,422,441

INK FOR IMPROVING PRINTHEAD LIFETIME

Memjet Technology Limited...

1. An inkjet ink comprising:
an ink vehicle;
a colorant; andan acetylenic compound having an alkoxylated hydroxyl group, wherein the hydroxyl group is a primary or secondary hydroxyl
group and the acetylenic compound is absent a lipophilic group, provided that the acetylenic compound is not a wetting agent.

US Pat. No. 9,522,542

SPOT COLOR ENHANCEMENT IN A DIGITAL INKJET PRESS

Memjet Technology Limited...

1. A method of enhancing spot color printing in a digital inkjet press having a fixed number of monochrome inkjet printheads,
the fixed number of monochrome inkjet printheads printing inks comprising at least process colors (CMY) and a spot color,
said method comprising the steps of:
printing a process color combination comprising a predetermined ratio of at least two process colors, the process color combination
approximating the spot color; and

printing the spot color with the process color combination to provide an enhanced spot color,wherein:
the spot color has a hue angle defined by h1*;
the process color combination has a hue angle defined by h2*; and
?10°?h1*?h2*?+10°.

US Pat. No. 9,498,951

INKJET NOZZLE DEVICE HAVING DUAL CHAMBER INLETS AND TWOFOLD SYMMETRY

Memjet Technology Limited...

1. An inkjet nozzle device comprising:
a nozzle chamber having a floor, a roof and perimeter sidewalls extending between the floor and the roof, wherein a nozzle
aperture is defined in the roof; and

a single heating element for generating gas bubbles in the nozzle chamber so as to eject ink through the nozzle aperture,
wherein a centroid of the heating element is aligned with a centroid of the nozzle aperture;

a pair of chamber inlets defined in the floor of the nozzle chamber, the chamber inlets being symmetrically disposed about
the centroid of the heating element; and

a pair of opposed baffle plates symmetrically disposed about the centroid of the heating element,wherein:
the inkjet nozzle device has a pair of orthogonal symmetry planes passing through the centroid of the nozzle aperture;
each baffle plate extends between a floor and a roof of the nozzle chamber, each baffle plate being positioned between a respective
chamber inlet and the heating element;

a central longitudinal axis of the heating element bisects each baffle plate; and
each baffle plate is wider than the heating element.

US Pat. No. 9,346,276

REMOVABLE PRINTHEAD CARTRIDGE HAVING PLURALITY OF PRINTHEAD CHIPS

Memjet Technology Limited...

1. A removable printhead cartridge for a single-pass inkjet printer, the printhead cartridge comprising:
a body adapted for user removal and insertion in the printer;
an elongate ink manifold assembly mounted on the body, the ink manifold assembly comprising: a plurality of longitudinally
extending ink channels; a plurality of outlets defined in a mounting surface of the ink manifold assembly; and a plurality
of ink conduits connecting each ink channel to a corresponding set of said outlets;

a plurality of printhead chips mounted on the mounting surface of the ink manifold assembly, each printhead chip receiving
ink from each ink channel via a respective set of said outlets;

a plurality of ink storage modules for delivering ink to the printhead chips at a negative pressure, each ink storage module
comprising a respective device for maintaining the negative pressure, each ink storage module being fluidically connected
to a respective ink channel, each ink storage module being positioned above the ink manifold assembly when the removable printhead
cartridge is mounted in the printer; and

a plurality of electrical connectors for establishing electrical connection with the printer when the removable printhead
cartridge is inserted in the printer.

US Pat. No. 9,566,795

COMPACT PINCH VALVE

MEMJET TECHNOLOGY LIMITED...

1. A pinch valve comprising:
a body;
a cam rotatably mounted on the body about a cam axis;
a first pinch arm pivotally and rotatably mounted on the body about a first pivot axis parallel with the cam axis, the first
pinch arm comprising a first cam follower for engagement with the cam and a first pinch element for pinching a first conduit,
the first conduit being positioned between the first pinch element and the cam axis;

a second pinch arm pivotally and rotatably mounted on the body about a second pivot axis parallel with the cam axis, the second
pinch arm comprising a second cam follower for engagement with the cam and a second pinch element for pinching a second conduit,
the second conduit being positioned between the second pinch element and the cam axis; and

a resilient element linearly interconnecting the first and second pinch arms between respective first and second spring mount
locations, the resilient element mutually biasing the first and second pinch arms towards each other such that movement of
the first pinch arm alters a biasing force exerted on the second pinch arm,
wherein the cam is positioned between the resilient element and the pivot axes; andwherein the mutual biasing of the first and second pinch arms towards each other provides a pinching force for pinching the
first and second conduits.

US Pat. No. 9,193,194

PRINTING ASSEMBLY HAVING LIFTABLE CARRIAGE WITH CONSTRAINED ROTATIONAL MOVEMENT

Memjet Technology Limited...

1. A printer assembly comprising:
a housing comprising a pair of opposite first and second sidewalls extending along a nominal x-axis, the first sidewall having
a guide slot extending along a z-axis, the guide slot being defined between opposite first bearing surfaces;

a shaft rotatably mounted between the sidewalls, the shaft extending along a y-axis;
first and second pinions fixedly mounted at either end of the shaft for rotation therewith;
a print bar carriage slidably received within the housing, the print bar carriage comprising:
a chassis;
first and second parallel racks fixed to the chassis, each rack being engaged with a respective pinion to define a rack-and-pinion
lift mechanism;

a set of first bearings rotatably mounted at a first side of the chassis, each first bearing being received in the guide slot;
and

a printhead supported by the chassis; and
a drive motor operatively connected to the shaft for rotating the shaft and thereby lifting the print bar carriage relative
to the housing along the z-axis via the rack-and-pinion lift mechanism,
wherein, during sliding movement of the print bar carriage, the set of first bearings travels within the guide slot and bear
against the first guide surfaces to constrain rotational movement of the print bar carriage.

US Pat. No. 10,071,561

INKJET PRINTHEAD HAVING WIDE FLUID OUTLETS RELATIVE TO PRINTHEAD CHIP WIDTH

MEMJET TECHNOLOGY LIMITED...

1. An inkjet printhead comprising:an elongate fluid manifold having a base defining a plurality of fluid outlets; and
a plurality of printhead chips attached to the base of the fluid manifold via an adhesive film, each printhead chip receiving ink from one or more fluid outlets via corresponding openings in the adhesive film,
wherein:
each fluid outlet extends transversely across the ink manifold; and
each fluid outlet and each corresponding opening of the adhesive film extends across at least half a width of each printhead chip.

US Pat. No. 9,370,929

INKJET PRINTING SYSTEM WITH MANOEVERABLE MAINTENANCE CHASSIS

Memjet Technology Limited...

1. An inkjet printing system comprising:
a plurality of print head cartridges, each extending across a direction of print media propagation and spaced apart along
the direction of print media propagation, each print head cartridge having a respective inkjet printhead;

a print head chassis for supporting the plurality of print head cartridges;
a lift mechanism for lifting and lowering the print head chassis relative to a platen; and
a movable maintenance chassis supporting a chassis sub-frame having a corresponding plurality of maintenance cradles mounted
thereon, each maintenance cradle maintaining a respective printhead, the chassis sub-frame being slidably movable with respect
to the maintenance chassis;
wherein:
the print head chassis, the maintenance chassis and the chassis sub-frame are movable in three mutually orthogonal directions.

US Pat. No. 10,005,299

PRINT MODULE WITH AIR COOLING ARRANGEMENT

Memjet Technology Limited...

1. A print module comprising:a body housing first and second opposed printed circuit boards (PCBs), each of the first and second PCBs having heat-generating electronic components;
an air inlet and an air outlet positioned towards an upper part of the body;
an air pathway extending between the air inlet and the air outlet;
a plurality of heatsinks, each heatsink being thermally coupled with one of the heat-generating components and having an array of cooling fins extending into the air pathway; and
an inkjet printhead receiving power and print data from at least one of the first and second PCBs,wherein the inkjet printhead is positioned toward a lower part of the print module.

US Pat. No. 9,469,098

METHOD OF INKJET PRINTING AND MAINTAINING NOZZLE HYDRATION

Memjet Technology Limited...

1. A method of printing from a fixed inkjet printhead having a plurality of ink planes, the method comprising the steps of:
feeding a print medium past the printhead in a media feed direction, the media feed direction defining relative upstream and
downstream sides of the printhead;

printing an image onto the print medium, the image being defined by image data; and
printing a keep-wet pattern onto the print medium from each ink plane of the printhead, the keep-wet pattern being defined
by a plurality of dots printed at a frequency sufficient to maintain hydration of each nozzle in the printhead,

wherein a first keep-wet pattern from a first ink plane is printed at a higher frequency than a second keep-wet pattern from
a second ink plane, the first ink plane being furthest upstream in the printhead.

US Pat. No. 10,035,357

INKJET PRINTHEAD WITH BUBBLE-VENTING CAVITIES OFFSET FROM FLUID OUTLETS

Memjet Technology Limited...

1. An inkjet printhead comprising:an elongate fluid manifold having a base comprising a plurality of fluid delivery compartments, each compartment having a fluid outlet and a bubble-venting cavity; and
one or more printhead chips attached to the base, each printhead chip receiving printing fluid from one or more fluid outlets,wherein each fluid outlet is aligned with a respective printhead chip and each bubble-venting cavity is offset from the respective printhead chip.

US Pat. No. 9,994,017

INKJET NOZZLE DEVICE HAVING IMPROVED LIFETIME

Memjet Technology Limited...

1. An inkjet nozzle device comprising:an aluminide heater element having native passivating oxide;
a discrete tantalum oxide layer is deposited directly on the aluminide heater element; and
a discrete metal oxide layer deposited directly on the tantalum oxide layer,wherein the aluminide heater element lacks any additional tantalum metal or tantalum oxide layers.

US Pat. No. 9,944,065

MULTI-COLOR PRINTER WITH INK PLUMBING FOR OPTIMIZED NOZZLE HYDRATION

MEMJET TECHNOLOGY LIMITED...

1. A multi-color printer comprised of a fixed pagewide array of monochrome inkjet printheads, the printheads being aligned with each other in a media feed direction, the printer comprising:a first printhead positioned furthest upstream relative to the media feed direction;
a first ink supply containing a lowest luminance ink of a multi-color ink set, the first ink supply being fluidically connected to the first printhead;
a second printhead positioned furthest downstream relative to the media feed direction;
a third printhead positioned between the first and second printheads; and
a second ink supply containing a highest luminance ink of the multi-color ink set, the second ink supply being fluidically connected to the third printhead.

US Pat. No. 9,776,415

SYSTEM FOR REMOVING CONDENSATION FROM PRINTHEAD ASSEMBLY

Memjet Technology Limited...

1. A printer comprising:
a platen comprising a plenum chamber having an apertured platen surface;
a printhead assembly comprising at least one inkjet printhead operatively positioned opposite the platen;
a feed mechanism for feeding a web of print media over the platen and along a printing feed path; and
a gas source connected to the plenum chamber;
a controller configured for periodically providing a pulse of positive gas pressure from the gas source to the plenum chamber,
thereby periodically diverting a portion of the web towards the printhead assembly and along a maintenance feed path,
wherein the portion of the web diverted along the maintenance feed path wipes part of the printhead assembly.

US Pat. No. 9,718,979

INKJET PRINTER HAVING PRINTHEAD AND INK FOR MINIMIZING CORROSION OF EXPOSED CORRODIBLE STRUCTURES WITHIN PRINTHEAD

Memjet Technology Limited...

1. An ink set for an inkjet printer, the ink set comprising different colored aqueous inks having different concentrations
of potassium ions, wherein:
a first ink comprising a first colorant contains a relatively lower concentration of potassium ions than a second ink comprising
a second colorant; and

the second ink contains an Al(III) additive in higher concentration than the first ink.

US Pat. No. 9,713,923

INKJET PRINTHEAD ASSEMBLY HAVING PRINTHEAD CHIP CARRIERS RECEIVED IN SLOT

Memjet Technology Limited...

1. An inkjet printhead assembly comprising:
a support structure defining a recess having a plurality of ink outlets;
a plurality of print modules
received in the recess in a neighboring arrangement, each print module comprising:
a printhead chip carrier having a plurality of ink inlets aligned with a corresponding plurality of ink outlets, a plurality
of ink delivery slots extending lengthwise along the printhead chip carrier, and a plurality of ink supply channels extending
between the ink inlets and the ink delivery slots; and

a printhead chip individually mounted on a respective printhead chip carrier, the printhead chip receiving ink from a respective
plurality of ink delivery slots,

wherein:
each ink supply channel is tapered from one of the ink inlets towards one of the ink delivery slots; and
the ink inlets are relatively wider than the ink delivery slots.

US Pat. No. 9,708,183

PROCESS FOR FILLING ETCHED HOLES

Memjet Technology Limited...

1. A process for filling one or more etched holes defined in a surface of a wafer substrate, said process comprising the steps
of:
(i) depositing a layer of a thermoplastic first polymer onto the surface and into each hole;
(ii) reflowing the first polymer;
(iii) exposing the wafer substrate to a controlled oxidative plasma so as to reveal the surface;
(iv) optionally repeating steps (i) to (iii);
(v) depositing a layer of a photoimageable second polymer so as to overfill each hole with said second polymer;
(vi) selectively removing the second polymer from regions outside a periphery of the holes to provide overfilled holes, the
selective removing comprising exposure and development of the second polymer; and

(vii) planarizing the surface to provide one or more holes filled with a plug comprising the first and second polymers, each
plug having a respective upper surface coplanar with the surface of the wafer substrate, wherein the first and second polymers
are different.

US Pat. No. 9,573,368

INKJET NOZZLE DEVICE HAVING IMPROVED LIFETIME

MEMJET TECHNOLOGY LIMITED...

1. An inkjet nozzle device including a resistive heater element for ejecting ink droplets through a nozzle opening, the resistive
heater element comprising:
an aluminide layer having a native passivating oxide; and
a tantalum oxide layer deposited on the native passivating oxide of the aluminide layer.

US Pat. No. 9,796,182

INKJET PRINTHEAD ASSEMBLY HAVING MODULAR PRINTHEAD CHIP CARRIERS DEFINING CONVERGENT INK GALLERIES

Memjet Technology Limited...

1. An inkjet printhead assembly comprising:
a support structure having a recess, the recess having a wall defining a plurality of ink supply apertures; and
a plurality of print modules received in the recess in a neighboring arrangement, each print module comprising:
a printhead chip carrier having a plurality of convergent ink galleries, each ink gallery receiving ink from at least one
ink supply aperture; and

a single printhead chip mounted on the printhead chip carrier, the single printhead chip receiving ink from the plurality
of convergent ink galleries.

US Pat. No. 9,777,176

METHOD OF EJECTING FLUID DROPLETS FROM THERMAL INKJET DEVICE

Memjet Technology Limited...

1. A method of ejecting a fluid from an inkjet nozzle device having a thermal actuator, the method comprising the steps of:
supplying the fluid to the inkjet nozzle device, the fluid comprising an acetylenic compound of formula (A):
R1—C?C—(CH2)mCH(R)—(OCH2R3)n—OH   (A); and

repeatedly actuating the thermal actuator so as to eject fluid droplets from a nozzle opening of the inkjet nozzle device,
wherein:
R1 is selected from the group consisting of: H, C1-3 alkyl; and —(CH2)pCH(R4)(R5);

R2 is selected from the group consisting of: H and C1-3 alkyl;

R3 is selected from the group consisting of: —CH2— and —CH(CH3)—;

R4 is selected from the group consisting of: H and C1-3 alkyl;

R5 is selected from the group consisting of: —OH and —(OCH2R3)q-OH;

m is 0, 1, 2 or 3;
n is 1 to 50;
p is 0, 1, 2 or 3; and
q is 1 to 50,
and wherein:
the acetylenic compound is present in an amount sufficient to increase a lifetime of the inkjet nozzle device; and
the acetylenic compound is not a wetting agent.

US Pat. No. 9,776,439

BELT ASSEMBLY FOR HIGH-SPEED INKJET PRINTING

Memjet Technology Limited...

1. A printer comprising:
a printhead assembly having a print zone;
a belt assembly for feeding print media past the print zone in a media feed direction, the belt assembly comprising:
an endless belt tensioned between a first roller upstream of the print zone and a second roller downstream of the print zone;
a drive mechanism for moving the endless belt in the media feed direction; and
a fixed platen positioned in the print zone,wherein the endless belt is guided around and below the fixed platen, such that the endless belt does not move through the
print zone and the print media is supported only by the fixed platen when moving through the print zone.

US Pat. No. 9,725,609

INK FORMULATIONS FOR IMPROVING PRINTHEAD LIFETIME

Memjet Technology Limited...

1. An inkjet ink comprising:
(i) a disazo dye of formula (I):

wherein:
A is a C6-14 aryl group having 0, 1, 2, 3, 4 or 5 substituents selected from the group consisting of:

—SO3M, nitro, carboxyl, halogen, hydroxyl, amino, C1-4 alkylamino, C1-4 alkoxy, C1-4 alkyl, C1-4 haloalkyl, cyano, sulfonamide, carbamoyl, C1-4 alkylamido and C1-4 alkoxycarbonyl;

B is a C6-14 aryl group having 0, 1, 2, 3, 4 or 5 substituents selected from the group consisting of:

—SO3M, nitro, carboxyl, halogen, hydroxyl, amino, C1-4 alkylamino, C1-4 alkoxy, C1-4 alkyl, C1-4 haloalkyl, cyano, sulfonamide, carbamoyl, C1-4 alkylamido and C1-4 alkoxycarbonyl;

each M is independently selected from the group consisting of: hydrogen, lithium, sodium, potassium, ammonium and quaternary
ammonium; and

the dye of formula (I) comprises at least 3 groups of formula —SO3M;

(ii) a glycol compound selected from the group consisting of: triethylene glycol, tetraethylene glycol and pentaethylene glycol;
and

(iii) water.

US Pat. No. 9,579,889

METHOD OF EJECTING INK DROPLETS HAVING VARIABLE DROPLET VOLUMES

Memjet Technology Limited...

1. A method of ejecting an ink droplet from an inkjet nozzle device having an actuator and a meniscus pinned across a nozzle
opening, said method comprising the steps of:
delivering a sub-ejection pulse to the actuator for perturbing the meniscus from a quiescent state; and
subsequently delivering an ejection pulse to the actuator at an instant when the meniscus is perturbed from its quiescent
state, the ejection pulse ejecting the ink droplet from the nozzle opening,
wherein:
a time period between a trailing edge of the sub-ejection pulse and a leading edge of the ejection pulse controls a droplet
volume of the ejected ink droplet;

a relatively shorter time period produces a relatively larger droplet volume; and
a relatively longer time period produces a relatively smaller droplet volume.

US Pat. No. 9,925,780

METHOD OF MAINTAINING PRINTHEADS USING CAPPERS MOVING IN OPPOSITE DIRECTIONS

Memjet Technology Limited...

1. A method of capping a plurality of printheads positioned in a staggered overlapping arrangement across a width of a media feed path, each printhead having a respective capper associated therewith, the method comprising the step of:moving the cappers towards respective printheads in a direction parallel to a media feed direction; and
lowering the printheads onto their respective cappers,wherein the cappers for neighboring printheads are moved in opposite directions towards their respective printheads.

US Pat. No. 10,160,233

PRINTER HAVING GUIDE FOR GUIDING PRINT MEDIA AROUND CURVED MEDIA PATH

MEMJET TECHNOLOGY LIMITED...

1. A printer having a beltless guide for guiding print media around a curved media path suitable for duplex printing, the guide comprising: first and second opposed guide surfaces for guiding print media therebetween; and at least one chicane corresponding to a point of inflection in the curved media feed path,wherein:
the media path does not follow a curvature of the chicane;
the chicane is configured to transfer, in a gap across the chicane, print media from contact with the second surface to contact with the first surface or vice versa;
the media path is not twisted within the gap about a longitudinal axis oriented in a media feed direction.

US Pat. No. 9,950,527

INKJET PRINTHEAD HAVING LATERALLY FLARED FLUID OUTLETS

Memjet Technology Limited...

1. An inkjet printhead comprising:an elongate fluid manifold having a plurality of fluid outlets positioned longitudinally along a base of the fluid manifold;
one or more printhead chips attached to the base of the fluid manifold, each printhead chip receiving printing fluid from one or more fluid outlets,wherein each fluid outlet is laterally flared towards a longitudinal edge of a respective printhead chip.

US Pat. No. 9,950,528

INKJET PRINTHEAD WITH AIR CAVITIES DEFINED BY RIBS PROTRUDING INTO FLUID CHANNEL

Memjet Technology Limited...

1. An inkjet printhead comprising:an elongate fluid manifold comprising: an inlet boss, an outlet boss, a longitudinal channel extending between the inlet and outlet bosses, a plurality of air cavities positioned above the longitudinal channel in a roof cavity of the fluid manifold, and plurality of fluid outlets defined in a floor of the longitudinal channel; and
a plurality of printhead chips attached to the base of the fluid manifold, each printhead chip receiving printing fluid from one or more fluid outlets,wherein:the air cavities are defined by ribs extending from a roof of the fluid manifold towards the longitudinal channel; and
each rib has a lip protruding beyond a lower surface of the inlet and outlet bosses.

US Pat. No. 10,173,438

PRINTER WITH SHEET FEEDING PAST MULTIPLE PRINTHEADS

Memjet Technology Limited...

1. A printer comprising:a first fixed printhead having a respective first print zone;
a second fixed printhead positioned downstream of the first printhead relative to a media feed direction, the second printhead having a respective second print zone;
an input roller assembly positioned upstream of the first print zone, the input roller assembly being configured for feeding media sheets along a downward trajectory, relative to the first printhead, towards the first print zone; and
an intermediary roller assembly positioned between the first and second print zones, the intermediary roller assembly being configured for receiving the media sheets from the first print zone and feeding the media sheets along a downward trajectory, relative to the second printhead, towards the second print zone,
wherein the second print zone is positioned relatively lower than the first print zone.

US Pat. No. 10,232,647

ROLLER FEED MECHANISM FOR PRINTER HAVING MULTIPLE PRINTHEADS

Memjet Technology Limited...

1. A printer comprising:a first fixed printhead having a respective first print zone;
a second fixed printhead positioned downstream of the first printhead relative to a media feed direction, the second printhead having a respective second print zone;
at least one fixed platen for supporting print media in the first and second print zones;
an input roller assembly positioned upstream of the first printhead, the input roller assembly comprising a pair of input rollers having a first nip force N1 therebetween;
an output roller assembly positioned downstream of the second printhead, the output roller assembly comprising a pair of output rollers having a second nip force N2 therebetween; and
an intermediary roller assembly positioned between the first and second printheads, the intermediary roller assembly comprising a pair of intermediary rollers having a third nip force N3 therebetween,
wherein N1>N2>N3.

US Pat. No. 10,160,212

METHOD OF PRINTING WITH AIR BLOWING ACROSS INKJET PRINTHEAD

Memjet Technology Limited...

1. A method of printing from a pagewide inkjet printhead having a plurality of print integrated circuits:feeding print media past the printhead in a single pass;
printing onto the print media using inkjet nozzles of the print integrated circuits; and
blowing air across the print integrated circuits during printing.

US Pat. No. 10,252,540

INK DELIVERY SYSTEM FOR SUPPLYING INK TO MULTIPLE PRINTHEADS AT CONSTANT PRESSURE

MEMJET TECHNOLOGY LIMITED...

1. An ink delivery system for an inkjet printer comprising:a positive ink line having a controlled positive ink pressure;
a negative ink line having a controlled negative ink pressure;
a plurality of print modules interconnected between the positive ink line and the negative ink line via respective inlet and outlet lines, each print module comprising:
an inlet port connected to the inlet line;
an outlet port connected to the outlet line;
a printhead interconnected between the inlet port and the outlet port;
a control valve positioned at the inlet port for dynamically controlling an ink pressure in the printhead;
an ink pressure sensor for sensing an ink pressure in the print module; and
a controller for receiving feedback from the pressure sensor and controlling the control valve in response to the feedback from the pressure sensor;
wherein, during printing, the ink pressure sensor, the controller and the control valve cooperate to control a backpressure in the printhead within a predetermined backpressure range.

US Pat. No. 10,239,316

PRINTHEAD HAVING HEATED SHIELD PLATE

MEMJET TECHNOLOGY LIMITED...

1. An inkjet printhead comprising:a manifold having a plurality of ink outlets defined in a manifold surface;
a plurality of printhead chips mounted to the manifold surface and aligned with the ink outlets;
a PCB mounted to the manifold surface and offset from the ink outlets, the PCB being electrically connected to the printhead chips; and
a shield plate covering the PCB,wherein the shield plate has one face in thermal contact with the PCB and an exposed opposite face defining a lower surface of the printhead.

US Pat. No. 10,232,652

METHOD OF MAINTAINING PRINTHEADS USING WIPERS MOVING IN OPPOSITE DIRECTIONS

Memjet Technology Limited...

1. A method of wiping a plurality of printheads positioned in a staggered overlapping arrangement across a width of a media feed path, each printhead having a respective wiper associated therewith,wherein:
the wipers for neighboring printheads are moved in opposite directions with respect to each other;
each wiper is mounted on a respective maintenance module; and
each maintenance module further comprises a capper for capping a respective printhead.

US Pat. No. 10,363,736

METAL ALLOY SHIM FOR MOUNTING PRINTHEAD CHIPS WITH HIGH BONDING STRENGTH

Memjet Technology Limited...

1. An inkjet printhead comprising:a rigid elongate manifold having one or more ink supply channels extending along its length and a plurality of ink outlets defined therein;
a shim attached to the manifold, the shim having a plurality of shim apertures for receiving ink from the ink outlets; and
one or more printhead chips adhesively bonded directly to the shim, each printhead chip receiving ink from one or more of the ink outlets,wherein:the shim is comprised of a metal alloy having a coefficient of thermal expansion (CTE) of 5 ppm/° C. or less; and
the metal alloy has an adhesion-promoting surface film layer.

US Pat. No. 10,343,402

INKJET PRINTHEAD HAVING DYNAMIC RESPONSE TO PRESSURE CHANGES

Memjet Technology Limited...

1. An inkjet printhead comprising:a rigid elongate manifold having one or more ink supply channels extending along its length, each ink supply channel having a base defining a plurality of ink outlets and a roof comprising an elongate flexible film; and
a plurality of printhead chips mounted to the manifold, each printhead chip receiving ink from one or more of the ink outlets,
wherein the flexible film comprises a plurality of operatively independent bellows positioned along a length of one or more ink supply channels, the bellows being operatively separated from each other by baffles.

US Pat. No. 10,329,146

PROCESS FOR FILLING ETCHED HOLES USING PHOTOIMAGEABLE THERMOPLASTIC POLYMER

Memjet Technology Limited...

1. A process for filling one or more etched holes defined in a frontside surface of a wafer substrate, said process comprising the steps of:(i) depositing a layer of a photoimageable thermoplastic polymer onto the frontside surface and into each hole;
(ii) reflowing the polymer;
(iii) selectively removing the polymer from regions outside a periphery of each hole, the selective removing comprising exposure and development of the polymer;
(iv) optionally repeating steps (i) to (iii) until each hole is overfilled with the polymer; and
(v) planarizing the frontside surface to provide one or more holes filled with a plug of the polymer, each plug having a respective upper surface coplanar with the frontside surface.

US Pat. No. 10,300,700

ELONGATE PRINTHEAD HAVING ROBUST ELECTRICAL ASSEMBLY

Memjet Technology Limited...

1. An inkjet printhead comprising:a rigid elongate carrier having at least one ink supply channel and a lower surface having a plurality of printhead chips mounted thereon;
a rigid PCB attached to the lower surface of the carrier, the PCB extending a length of the carrier and projecting laterally beyond a sidewall of the carrier;
a lead retainer attached to the sidewall of the carrier; and
a plurality of leads extending upwardly from contact pads positioned along a longitudinal edge portion of the PCB, each lead being secured to the sidewall of the carrier via the lead retainer,wherein the PCB supplies power and data to the printhead chips via electrical connections between the PCB and the printhead chips.

US Pat. No. 10,293,609

INKJET PRINTHEAD FOR FULL COLOR PAGEWIDE PRINTING

Memjet Technology Limited...

1. An inkjet printhead comprising:a rigid elongate manifold having first, second, third and fourth parallel ink supply channels extending along the manifold and corresponding first, second, third and fourth parallel rows of outlets defined in the manifold, each row of outlets being in fluid communication with a respective one of the ink supply channels, wherein a first ink delivery group contains the first and second rows of outlets and a second ink delivery group contains the third and fourth rows of outlets;
a first array of printhead chips mounted to a unitary lower surface of the manifold, each printhead chip of the first array receiving ink from the first and second rows of outlets; and
a second array of printhead chips mounted to the lower surface of the manifold, the second array of printhead chips being parallel and aligned with the first array of printhead chips, each printhead chip of the second array receiving ink from the third and fourth rows of outlets,wherein a distance between the first and second ink delivery groups is greater than a distance between the first and second rows of outlets or the third and fourth rows of outlets.

US Pat. No. 10,293,622

METHOD OF MINIMIZING STITCHING ARTIFACTS FOR OVERLAPPING PRINTHEAD SEGMENTS

MEMJET TECHNOLOGY LIMITED...

1. A method of printing an image using a printing system comprising at least first and second overlapping printhead segments, the method comprising the steps of:(i) identifying a strip of the image to be printed in an overlap region of the first and second printhead segments;
(ii) determining a continuous seam in the strip based on a cost function, the cost function including at least one parameter selected from the group consisting of: (a) minimizing a density of printed ink along the seam; and (b) maximizing a luminance along the seam; and
(iii) printing the image using the first and second printhead segments, the printing comprising stitching the first and second printhead segments across the seam,
wherein:
the strip contains variable image content and the seam has a varying position within the strip;
the seam is determined from a row-by-row analysis of the image content contained in the strip, each row having a stitch point determined by the cost function;
the cost function includes a parameter defining a maximum threshold distance between contiguous stitch points in the strip; and
the threshold distance is 1, 2, 3, 4 or 5 horizontal pixel or dot positions between contiguous stitch points.

US Pat. No. 10,384,461

INKJET PRINTHEAD HAVING BRACED LONGITUDINAL CHANNEL

MEMJET TECHNOLOGY LIMITED...

1. An inkjet printhead comprising:an elongate fluid manifold comprising at least one longitudinally extending channel having a pair of opposite longitudinal sidewalls and a base defining a floor of the channel;
a plurality of printhead chips bonded to the base of the fluid manifold, each printhead chip receiving ink from one or more fluid outlets defined in the floor of the channel; and
a plurality of transverse ribs extending across the channel between the sidewalls, each transverse rib extending upwardly from the floor of the channel.

US Pat. No. 10,377,137

PRINTHEAD CHIP ARRAY HAVING DUMMY COLOR CHANNEL

Memjet Technology Limited...

1. An inkjet printhead comprising:a manifold having a plurality of ink outlets defined in a manifold surface;
a plurality of printhead chips mounted to the manifold surface, each printhead chip having an odd number of color channels, each color channel having at least one respective row of thermally-actuated inkjet nozzle devices, each one of the inkjet nozzle devices having one corresponding nozzle,wherein a central color channel of each printhead chip is a dummy color channel having non-ejecting nozzles that do not receive ink from the manifold.

US Pat. No. 10,377,131

METHOD OF MULTI-COLOR PAGEWIDE PRINTING WITH OPTIMIZED NOZZLE HYDRATION

Memjet Technology Limited...

1. A method of multi-color printing in a single pass using a fixed pagewide array of monochrome inkjet printheads, the printheads being aligned with each other in a media feed direction, the method comprising the steps of:feeding print media along the media feed direction past a first printhead positioned furthest upstream in the array, a third printhead downstream of the first printhead and a second printhead positioned furthest downstream in the array;
printing a yellow ink onto the print media using the first printhead;
printing a black ink onto the print media using the third printhead; and
printing a cyan or magenta ink onto the print media using the second printhead,
wherein:
each of the first, second and third printheads prints a respective keep-wet pattern onto print media;
each keep-wet pattern is defined by a plurality of dots printed at a frequency sufficient to maintain hydration of each nozzle of a respective printhead;
all nozzles of the first printhead print a first keep-wet pattern at a first average frequency, all nozzles of the second printhead print a second keep-wet pattern at a second average frequency, and all nozzles of the third printhead print a third keep-wet pattern at a third average frequency; and
the first average frequency is higher than the third average frequency.

US Pat. No. 10,399,354

INKJET PRINTHEAD HAVING PRINTHEAD CHIPS ATTACHED TO TRUSS STRUCTURE

Memjet Technology Limited...

1. An inkjet printhead comprising:an elongate fluid manifold having a base comprising a truss structure, the truss structure having webs extending between opposite chords, wherein a plurality of openings between the webs and the chords define fluid outlets; and
one or more printhead chips attached to the webs of the truss structure, each printhead chip receiving printing fluid from a plurality of the fluid outlets,
wherein:
each fluid outlet is laterally flared from one side of a respective printhead chip towards an opposite side of the printhead chip;
a wider end of each fluid outlet extends beyond a longitudinal edge of a respective printhead chip; and
each fluid outlet is flared towards a respective bubble-venting cavity.

US Pat. No. 10,369,792

FLUID COUPLING HAVING EQUALIZED PRESSURE DROPS IN MULTIPLE FLUID LINES

Memjet Technology Limited...

1. A multi-channel fluid coupling for a printhead, the fluid coupling comprising:a body having a first channel and a second channel fluidically isolated from the first channel, the second channel being relatively longer than the first channel;
a first inlet port and a first outlet port at opposite ends of the first channel, the first inlet port and first outlet port projecting outwardly from the body; and
a second inlet port and a second outlet port at opposite ends of the second channel, the second inlet port and second outlet port projecting outwardly from the body;
wherein:
the first and second channels are configured for proportionally modulating a flow resistance of fluids flowing therethrough.

US Pat. No. 10,369,802

INK FILTER WITH PASSIVE DE-AERATION

Memjet Technology Limited...

11. An inkjet printer comprising:an ink tank containing ink having a predetermined ink level;
an ink filter positioned below the predetermined ink level; and
an inkjet printhead positioned above the predetermined ink level,wherein the ink filter comprises:a filter chamber having a filter inlet port for receiving ink from the ink tank, a filter outlet port for delivering ink to the printhead and a vent port, the vent port being positioned in a roof of the filter chamber;
a filter material positioned between the filter inlet port and the filter outlet port; and
a closed vent chamber connected to the vent port,and wherein the vent chamber has at least one wall exposed to atmosphere comprised of an air-permeable polymer.

US Pat. No. 10,357,970

SHIM ALIGNMENT FOR MULTIPLE ROWS OF PRINTHEAD CHIPS

Memjet Technology Limited...

1. An inkjet printhead comprising:a manifold having a plurality of ink outlets defined in a manifold surface;
a shim adhesively bonded to the manifold surface, the shim having apertures aligned with the ink outlets;
a first row of printhead chips adhesively bonded to the shim; and
a second row of printhead chips adhesively bonded to the shim,wherein:the shim is a one-part common shim for mounting all printhead chips of the first and second row; and
the shim comprises first and second longitudinal shim portions corresponding to the first and second rows of printhead chips, each of the first and second longitudinal shim portions comprising respective first and second apertures.

US Pat. No. 10,350,891

STRAIN-RELIEVED PRINTHEAD CASING

Memjet Technology Limited...

1. A printhead cartridge comprising:an elongate manifold;
a plurality of printhead chips mounted to a lower part of the manifold; and
a casing mounted to an upper part of the manifold,
wherein the casing comprises a first casing part and a second casing part arranged lengthwise along a line parallel with a longitudinal axis of the manifold, the first and second casing parts being longitudinally resiliently biased towards each other such that the casing is expandable along the longitudinal axis.

US Pat. No. 10,350,903

INKJET PRINTHEAD HAVING TRUSS STRUCTURE WITH BRACING RIBS

Memjet Technology Limited...

1. An inkjet printhead comprising:an elongate fluid manifold having a base comprising a truss structure, the truss structure having webs extending between opposite chords, wherein a plurality of openings between the webs and the chords define fluid outlets;
a plurality of bracing ribs extending across an upper surface of the truss structure, each bracing rib being aligned with one of the webs; and
one or more printhead chips attached to a lower surface of the truss structure, each printhead chip receiving printing fluid from a plurality of the fluid outlets.

US Pat. No. 10,350,922

PRINT BAR ASSEMBLY HAVING LIFTABLE CARRIAGE WITH CONSTRAINED ROTATIONAL MOVEMENT

MEMJET TECHNOLOGY LIMITED...

1. A print bar assembly comprising:a mounting frame comprising a pair of opposite first and second sidewalls extending parallel to a media feed direction, the first sidewall having an upwardly extending first guide slot defined between opposite first bearing surfaces;
a print bar carriage slidably received within the mounting frame between the first and second sidewalls; and
an actuation mechanism operatively connected to the print bar carriage for lifting and lowering the print bar carriage relative to the mounting frame,wherein the print bar carriage comprises:a chassis;
a pair of first bearings rotatably mounted at a first side of the chassis, each first bearing being received in the first guide slot;
a singular second bearing positioned at an opposite side of the print bar carriage and bearing against a respective second bearing surface; and
a printhead supported by the chassis,and wherein, during sliding movement of the print bar carriage relative to the mounting frame, the pair of first bearings and the second bearing cooperate to constrain rotational movement of the print bar carriage.