US Pat. No. 10,094,922

HYBRID HEIGHT AND LOCATION ESTIMATION IN RTLS

CENTRAK, INC., Newton, P...

1. A position location system to measure a height of a portable device above a floor, the system comprising:an infrared (IR) transmitter;
a first and a second ultrasound (US) transmitters, the first and the second US transmitters arranged at respective predetermined distances from the floor, the floor comprising a first reference plane;
an IR receiver in the portable device, the IR receiver configured to receive an IR signal from the IR transmitter;
a US receiver in the portable device, the US receiver configured to receive a first US signal from the first US transmitter and a second US signal from the second US transmitter; and
a processor in the portable device, the processor coupled to a memory and further coupled to the IR receiver and the US receiver,
wherein the processor is configured to detect:
a time of flight (ToF) of the first US signal from the first US transmitter to the US receiver; and
a ToF of the second US signal from the second US transmitter to the US receiver, and
wherein the height of the portable device above the floor is measured based upon a detected time difference in ToF between the first and second US signals.

US Pat. No. 9,341,700

SYSTEM AND METHOD FOR MULTIMODE WI-FI BASED RTLS

CENTRAK, INC., Newtown, ...

1. A dual-mode position-locating tag, comprising:
a transmitter module to communicate via a Wi-Fi signal with a Wi-Fi network through a fixed-location Wi-Fi base station, wherein
the Wi-Fi signal comprises information usable to produce a first location measurement;

a transceiver module to communicate with a non-Wi-Fi network;
a processor coupled to the transmitter module and the transceiver module; and
at least one location sensor coupled to the processor, the location sensor coupled to a secondary technology receiver, wherein
the secondary technology receiver receives a signal that is usable to produce a second location measurement,

wherein the processor synchronizes a time clock of the dual-mode position-locating tag to the non-Wi-Fi network by use of
synchronization signals received by the non-Wi-Fi transceiver.

US Pat. No. 9,298,958

SYSTEM AND METHOD OF ENHANCED RTLS FOR IMPROVED PERFORMANCE IN WIRELESS NETWORKS

CENTRAK, INC., Newtown, ...

1. A wireless active RFID system, comprising:
a plurality of access points, wherein each access point is groupable by a characteristic in common with another access point;
a system controller communicatively coupled to a system memory and to the plurality of access points; and
an active RFID tag, the tag comprising:
a transmitter module configured to transmit, to access points in the system, request for an acknowledgement from any member
of a predetermined group of access points, wherein where the acknowledgement comprises an information selected from a group
consisting of:

a time reference used by the system; and
an identification of secondary technologies used by the system.

US Pat. No. 9,306,665

SYSTEM AND METHOD FOR INFRARED SIGNAL-STRENGTH RTLS

CENTRAK, INC., Newtown, ...

1. A method to generate a signal for signal strength detection by a receiver, comprising:
selecting a high power level of a transmitter, wherein the high power level is expected to be received at or above a receiver
threshold of the receiver, at a predetermined distance from the transmitter;

selecting a low power level of the transmitter, wherein the low power level is expected to be received below the receiver
threshold, at the predetermined distance from the transmitter;

transmitting, by the transmitter, a marker signal at the high power level; and
adjacent in time to the marker signal, transmitting a power-varying signal, wherein a power of the power-varying signal varies
monotonically between the high power level and the low power level.

US Pat. No. 9,589,462

SYSTEM AND METHOD FOR CCX BASED SENSOR DATA TRACKING WITH HIGHLY ASSURED DATA DELIVERY

CENTRAK, INC., Newtown, ...

1. A one-directional wireless data collection system to provide highly assured data delivery to recover data recorded by a
sensor of a tag during a network disruption, the system comprising:
the tag, the tag comprising:
the sensor configured to provide a measurement of an environmental characteristic at a first average repetition rate R;
a memory coupled to the sensor and configured to store M previous measurements of the environmental characteristic measured
by the sensor; and

a transmitter module coupled to the memory and configured to transmit a plurality of transmissions, each transmission comprising
a present measurement of the environmental characteristic and a plurality of previous measurements of the environmental characteristic
selected from the M previous measurements; and

a system controller to wirelessly receive the plurality of transmissions from the tag, the system controller coupled to a
database of received measurements of the environmental characteristic, the system controller programmed to perform the steps
of:

extracting the present measurement and the plurality of previous measurements of the environmental characteristic from each
respective transmission of the plurality of transmissions;

adding the present measurement of the environmental characteristic to the database;
detecting, in each respective transmission, any of the previous measurements of the plurality of previous measurements missing
from the database by comparing said plurality of previous measurement of the environmental characteristic from the respective
transmission with the received measurements of the environmental characteristic in the database;

for said detected previous measurements, adding said detected previous measurements to the database, without request for retransmission
of said detected previous measurements,

wherein each transmission contains a different plurality of previous measurements compared to an immediately-preceding transmission,
and

wherein the plurality of previous measurements comprises a subset of the M previous measurements of the environmental characteristic,
and the subset comprises measurements to be reported at a first rate that is N1 times slower than the first average repetition
rate R.

US Pat. No. 9,510,146

SYSTEM AND METHOD OF SUPER SYNCHRONIZATION IN RTLS

CENTRAK, INC., Newtown, ...

1. A real-time location (RTL) system comprising:
a plurality of groups, each group comprising:
a battery-operated wireless timing beacon generator to transmit timing beacons, wherein the timing beacon generator obtains
its timing synchronization for the timing beacons wirelessly from a timing server; and

one or more battery-operated secondary technology base-stations to receive the timing beacons, and to transmit respective
secondary technology transmissions based on the received timing beacons; and

a portable tag to be located, the portable tag configured to receive timing beacons and secondary technology transmissions
from at least one group.

US Pat. No. 9,219,984

SYSTEM AND METHOD OF SUPER SYNCHRONIZATION IN RTLS

CENTRAK, INC., Newton, P...

1. A wireless infrared-aided location system, comprising:
a portable tag to be located, the portable tag comprising an infrared (IR) receiver; and
a plurality of infrared (IR) base-stations, at least two of said IR base-stations comprising:
a processor coupled to a memory;
a first clock coupled to the processor, the first clock configured to be selectively activated and deactivated by the processor;
a second clock coupled to the processor, the second clock having a relatively lower rate than a rate of the first clock, wherein
the processor is configured to operate from the second clock when the first clock is inactive;

a receiver coupled to the processor, the receiver configured to receive a timing synchronization signal; and
an infrared transmitter coupled to the processor, the infrared transmitter configured to transmit an IR signal to the portable
tag, wherein the IR signal is substantially identical and in-phase with IR signals from other IR base-stations,

wherein the processor is configured to synchronize said IR base-station to the timing synchronization signal.

US Pat. No. 10,126,407

METHODS AND SYSTEMS FOR SYNCHRONIZED ULTRASONIC REAL TIME LOCATION

CenTrak, Inc., Newtown, ...

1. A system comprising:a server;
a transceiver base station;
a plurality of location base stations having a respective plurality of location base station IDs, each location base station ID being associated with a respective location; and
a plurality of portable tags having a respective plurality of tag IDs;
wherein:
the transceiver base station is configured to transmit timing synchronization information (TSI) via a first type of communication technology to one or more of the plurality of location base stations;
one location base station of the plurality of location base stations is configured to receive the TSI via the first type of communication technology, and to transmit a signal including its respective location base station ID at a time determined from the received TSI, via a second type of communication technology, different from the first type of communication technology;
at least one portable tag of the plurality of portable tags is configured: 1) to receive the signal corresponding to the second type of communication technology, 2) to detect timing information and the location base station ID from the received signal, 3) to store the detected location base station ID and 4) to transmit, via the first type of communication technology and at a time determined from the timing information, a communication signal, including the stored base station ID and the tag ID to the transceiver base station; and
the transceiver base station is configured: 1) to receive and decode the communication signal from the portable tag, 2) to transmit the tag ID and the location base station ID in the received communication signal to the server; and
the server is configured to associate the portable tag with the respective location associated with the location base station ID.

US Pat. No. 9,622,030

METHODS AND SYSTEMS FOR SYNCHRONIZED ULTRASONIC REAL TIME LOCATION

Centrak, Inc., Newtown, ...

1. A system comprising:
a server;
one or more portable devices, each portable device having a respective portable device ID;
one or more ultrasonic base stations;
a plurality of RF base stations coupled to a backbone network, at least a first RF base station of the plurality of RF base
stations configured to transmit timing synchronization information (TSI) to the one or more ultrasonic base stations, wherein:

one ultrasonic base station of the one or more ultrasonic base stations is configured to receive the TSI and to transmit an
ultrasonic signal including an ultrasonic base station ID at a time determined from the received TSI, the ultrasonic base
station ID being associated with a location of the one ultrasonic base station;

the portable device is configured: 1) to detect the ultrasonic base station ID from the received ultrasonic signal, 2) to
store the ultrasonic base station ID as a digital value, and 3) to transmit an RF output signal including the ultrasonic base
station ID and the portable device ID to a second RF base station of the plurality of RF base stations;

the second RF base station is configured to 1) receive the signal from portable device, and 2) send the portable device ID
and the ultrasonic base station ID to the server; and

the server is configured to receive the portable device ID and the ultrasonic base station ID from the second RF base station
and to associate the portable device having the portable device ID with the location of the ultrasonic base station having
the base station ID.

US Pat. No. 9,231,699

METHODS AND SYSTEMS FOR SYNCHRONIZED INFRARED REAL TIME LOCATION

Centrak, Inc., Newtown, ...

1. A system for determining a location of a portable device, the system comprising:
a plurality of stationary infrared (IR) base stations grouped into at least first and second groups, each group including
multiple IR base stations, the IR base stations in each group being configured to receive timing synchronization information
and, at a common predetermined time based on the received timing synchronization information, to transmit corresponding IR
location codes, each IR location code representative of a location of the corresponding IR base station, wherein the IR base
stations in the different groups are configured to transmit their corresponding IR location codes at respectively different
predetermined times based on the received timing synchronization information;

a plurality of portable devices, each portable device configured to detect the IR location codes transmitted by the respective
IR base stations and, if one of the IR location codes is detected, transmit an output signal including a portable device ID
representative of the portable device and the detected IR location code; and

at least one radio frequency (RF) transceiver configured to periodically provide, upon a request, the timing synchronization
information to the respective IR base stations relative to a unified time of origin.

US Pat. No. 10,152,862

ANTI-THEFT SECURITY DEVICE AND PERIMETER DETECTION SYSTEM

CenTrak, Inc., Newtown, ...

1. A security tag system comprising:a security tag configured to be connected to an object, wherein the security tag includes a wireless transceiver;
a remote collector system being configured to
communicate with the security tag via the wireless transceiver,
generate a security message when a location of the security tag corresponds to a predetermined unauthorized location, and
transmit the security message including the location of the security tag corresponding to the predetermined unauthorized location;
at least one camera configured to be turned to the location corresponding to the predetermined unauthorized location; and
at least one mobile device configured to
generate an interactive map of a commercial location and display the location of the security tag relative to the interactive map of the commercial location, and
receive and display a camera image of the at least one camera, the camera image corresponding to the location of the security tag corresponding to the predetermined unauthorized location.

US Pat. No. 10,083,328

DISPOSABLE WEARABLE APPARATUS TO TRACK LOCATION

CENTRAK, INC., Newtown, ...

1. An apparatus to track location, comprising:a substantially planar disposable housing comprising an electronics compartment;
a secondary technology sensor disposed along a periphery of the disposable housing;
an electronics module disposed within the electronics compartment, the electronics module comprising:
a processor coupled to a memory;
an RF transceiver coupled to an RF antenna and to the processor;
a secondary technology transceiver coupled to the processor; and
a battery coupled to the apparatus, wherein the battery is not field-replaceable; and
a marking on the apparatus, the marking to indicate a period of recommended usage that the apparatus is operable.

US Pat. No. 9,794,904

SYSTEM AND METHOD OF SUPER SYNCHRONIZATION IN RTLS

CENTRAK, INC., Newtown, ...

1. A real-time location system comprising:
a tag and a plurality of groups, each group comprising:
a plurality of battery operated secondary technology base-stations; and
a battery operated wireless timing beacon generator to provide a timing beacon to the group,
wherein the timing beacon generator for a group obtains timing information for the timing beacon wirelessly from a timing
server, and

wherein each timing beacon generator transmits timing beacons with timing information to the plurality of base-stations in
the group, and each secondary technology base-station transmits a secondary technology signal to the tag based on the received
timing beacon.

US Pat. No. 9,965,657

DISPOSABLE PATIENT TAG

CENTRAK, INC., Newton, P...

1. A system to collect patient tags for refurbishment, comprising:a collection drop box;
a closeable opening coupled to a wall of the collection drop box, the closeable opening configured to accept patient tags for refurbishment;
a detection apparatus designed to detect when a patient tag is dropped into the drop box; and
a communication interface communicatively coupled to the detection apparatus and to a remote monitoring system, the communication interface configured to send a status report to the monitoring system, wherein the communication interface is embedded in the patient tag.

US Pat. No. 9,939,512

SYSTEM AND METHOD OF FAST TRANSITION DETECTION IN ASYNCHRONOUS RTLS

CENTRAK, INC., Newtown, ...

1. A Real Time Location (RTL) system comprising:a base-station comprising: a processor coupled to a memory; and an interface to couple the processor with a secondary technology communication channel,
wherein the processor is programmed to cause the base-station to emit: a first periodic signal on the secondary technology communication channel and having a first repetition rate, to communicate an identification of the base-station; and a second periodic signal on the secondary technology communication channel and having a second repetition rate, to provide a wake-up signal, wherein transmitted energy of the second periodic signal in one period of the second periodic signal is less than transmitted energy of the first periodic signal in one period of the first periodic signal, and
wherein the second periodic signal is continuously periodic when not overlapping the first periodic signal.

US Pat. No. 10,511,930

REAL-TIME LOCATION SMART SPEAKER NOTIFICATION SYSTEM

CenTrak, Inc., Newtown, ...

1. A system for presenting a notification for playback at a smart speaker device, the system comprising:a real-time location (RTL) server configured to communicate with a backbone network;
a base station configured to transmit a signal including an identifier of the base station to a portable device, the portable device configured to transmit an output signal including a portable device ID representative of the portable device to at least one radio frequency network access point (RF-NAP);
wherein the output signal of the portable device includes the identifier of the base station combined with the portable device ID, defining a combined ID signal; and
wherein the at least one RF-NAP communicates via the backbone network to the RTL server and a notification server;
the notification server configured to associate the notification with the portable device ID, and at least one of generate, store, distribute, cue and present for playback the notification based on the portable device ID; and
a smart speaker device configured to communicate with the base station and the RF-NAP to receive communication from the notification server, the smart speaker device is associated with a location,
wherein the RTL server is configured to determine the location and an identity of the portable device based on receiving the combined ID signal from the portable device, and
wherein the notification server is configured to cue the associated notification for playback at the smart speaker device based on the determined location of the portable device.

US Pat. No. 10,395,456

NOISE-TOLERANT SECURITY SYSTEM

CenTrak, Inc., Newtown, ...

1. A security system comprising:a tag that receives, to the extent present, electromagnetic radiation (EM) in the LF band, wherein the EM radiation contains either an LF signal, LF emissions but no LF signal, or both an LF signal and LF emissions, and
wherein, when the EM radiation includes the LF emissions, either alone or in conjunction with an LF signal, the tag:
(a) detects the LF emissions;
(b) generates, in response to detecting the LF emissions, a RF signal capable of resulting in a change-of-state of a final control element; and
(c) transmits the RF signal.

US Pat. No. 10,365,347

METHODS AND SYSTEMS FOR SYNCHRONIZED ULTRASONIC REAL TIME LOCATION

CenTrak, Inc., Newtown, ...

1. An ultrasonic base station, comprising:a radio frequency (RF) receiver, coupled to a time server via a backbone network and configured to receive timing synchronization information from the time server via the backbone network; and
an ultrasonic transmitter configured to transmit an ultrasonic location code at a time determined from the received timing synchronization information, the ultrasonic location code representative of a location of the ultrasonic base station, wherein the ultrasonic base station transmits a request to the time server, via the backbone network; to receive the timing synchronization information.

US Pat. No. 10,593,187

APPARATUS COMPRISING A BED PROXIMITY-DETERMINING SYSTEM

CenTrak, Inc., Newtown, ...

1. An apparatus comprising a bed proximity-determining system, the bed proximity-determining system comprising:a first infrared transmitter for transmitting an infrared signal, wherein the first infrared transmitter is associated with and is physically coupled to a surface of a room;
one or more ultrasound transmitters that transmit ultrasound;
a tag, the tag having an IR receiver for receiving the infrared signal, an ultrasound receiver for receiving ultrasound from the one or more ultrasound transmitters, and a transmitter that transmits first proximity-related information based on the received ultrasound;
a first transceiver that receives the first proximity-related information and either:
(a) transmits the first proximity-related information, or
(b) generates and transmits second proximity-related information that is based on the first proximity-related information; and
a bed controller, wherein the bed controller receives the first proximity-related information or second proximity-related information, and performs at least one of the following actions:
(a) generates a control signal based on the first or second proximity-related information;
(b) generates a command based on the first or second proximity-related information; or
(c) transmits the first or second proximity-related information.

US Pat. No. 10,609,526

REAL-TIME LOCATION SYSTEM, DEVICE AND METHODS

CenTrak, Inc., Newtown, ...

1. A real-time location system comprising:a backbone network having access points and a server;
a plurality of monitors mounted at locations around a facility, each monitor configured to transmit a unique location code using a secondary transmission technology, said location code being mapped to a location in a facility at which said monitor is mounted;
at least one tag having a tag ID, said tag being configured to receive a location code and to transmit said tag ID back to at least one of said monitors using an alternative RF technology;
wherein said monitor is also configured to receive and forward said tag ID to at least one of said access points using a first RF protocol other than the alternative RF technology; and
wherein the first RF protocol is compliant with an 802.11 standard and the alternative RF technology uses a shorter-range protocol; and
wherein said monitors are further configured to transmit RF beacons using a second RF protocol and said tags are further configured to receive the RF beacons from plural monitors and to retransmit, if said tag is not within range to detect said location code, to at least one of said monitors, information indicative of a power level of each of said received beacons or from which said power levels can be calculated.