US Pat. No. 9,189,604

GAS ACTIVATED CHANGES TO LIGHT ABSORPTION AND EMISSION CHARACTERISTICS FOR SECURITY ARTICLES

SPECTRA SYSTEMS CORPORATI...

1. A security article, comprising:
a host material comprising a gas-activated security feature that emits at different wavelengths when exposed to changes in
gas environment incorporated upon or within the host material; and

a gas impermeable layer selectively applied over said gas-activated security feature leaving portions of said gas-activated
security feature exposed,

wherein the gas-activated security feature emits a first spectral emission that changes to a second spectral emission as said
exposed portions upon exposure to a change in gas environment of the gas activated security feature.

US Pat. No. 9,475,334

GASOCHROMIC FIBERS AND INCLUSIONS FOR SECURITY ARTICLES

SPECTRA SYSTEMS CORPORATI...

1. A secured article, comprising:
a substrate; and
at least one security feature embedded in said substrate, said security feature emitting at different wavelengths when exposed
to changes in gas environment,

wherein the security feature emits a first spectral emission when exposed to excitation energy in a first gas environment,
said first emission changing to a second spectral emission upon exposure to a change in said first gas environment.

US Pat. No. 9,292,989

TEMPERATURE ACTIVATED CHANGES TO LIGHT ABSORPTION AND EMISSION CHARACTERISTICS FOR SECURITY ARTICLES

SPECTRA SYSTEMS CORPORATI...

1. A security article, comprising:
a host material comprising a temperature sensitive security feature comprising a plurality of nanostructures having a high
surface area to volume ratio exhibiting a plurality of excitation defects throughout the host material, wherein the temperature
sensitive security feature is capable of emitting a spectral emission that changes upon exposure to a change in temperature
of the temperature sensitive security feature.

US Pat. No. 9,610,619

SUPERCRITICAL FLUID CLEANING OF BANKNOTES AND SECURE DOCUMENTS

Spectra Systems Corporati...

1. An apparatus for cleaning a banknote including a substrate, visual data and a security feature, comprising:
a chamber containing a supercritical fluid at a temperature and a pressure and for a duration sufficient to clean the substrate
and not compromise the security feature and the visual data of the banknote; and

the chamber further containing a structure holding the banknote so that the supercritical fluid circulates through and around
the banknote to remove one or more substances into the supercritical fluid;

wherein the visual data is printed on the substrate using Flexo inks, gravure inks, intaglio inks, dry color pigments blended
with oils and extenders, or phosphor chips containing micro-interference layers; and

wherein the security feature includes laminated polymer or paper security threads, windowed security threads, quasi-public
security threads, magnetic inks or threads, demetalized security threads, lenticular lens array security threads, fluorescent
or non-fluorescent security threads, holographic features, planchettes, digital watermarks, numeric watermarks, Guilloche
patterns, microprinting, applied foils, blind embossings, latent images that render different information from different viewing
angles, optically variable pigments producing different color effects depending on viewing angles, metallic effect inks, inks
that fluoresce or phosphoresce under illumination with ultraviolet or infrared sources, or M features.

US Pat. No. 9,075,020

GAS ACTIVATED CHANGES TO LIGHT ABSORPTION AND EMISSION CHARACTERISTICS FOR SECURITY ARTICLES

SPECTRA SYSTEMS CORPORATI...

1. A security article, comprising:
a host material comprising a security feature that emits a first and second spectral emission at different wavelengths when
exposed to changes in gas environment incorporated upon or within the host material,

wherein the security feature emits said first spectral emission when exposed to excitation energy in a first gas environment,
said first emission changing to said second spectral emission upon exposure to a change in said first gas environment.

US Pat. No. 9,905,069

OPTICALLY BASED BANKENOTE AUTHENTICATION SYSTEM HAVING BROKE DISCRIMINATION

SPECTRA SYSTEMS CORPORATI...

1. A method for processing a banknote, comprising:
providing a banknote having at least one photonically active security feature, the banknote being moved along a conveyance
path;

illuminating the at least one security feature with light from a stimulus source;
identifying a location of the at least one security feature by detecting an emission from the security feature;
characterizing a size or shape of the security feature and targeting said security feature if said security feature meets
a threshold size or shape;

directing an excitation source at the targeted security feature;
illuminating the targeted security feature with light from the excitation source; and
detecting a further emission from the photonically active security feature in response to the light from the excitation source.

US Pat. No. 9,777,437

SYSTEMS AND METHODS FOR REVERSING BANKNOTE LIMPNESS

Spectra Systems Corporati...

1. A method for enhancing the structural strength of a porous substrate of a first material having pores therein, comprising:
soaking the porous substrate in a solution having a first solvent and at least one polymer comprising a second material distinct
from the first material dissolved in the first solvent at a specific temperature and pressure, such that the solution is deposited
within pores of the porous substrate;

soaking the porous substrate in a second solvent, such that the first solvent diffuses into the second solvent, and such that
the at least one polymer remains within the pores of the porous substrate; and

flushing out the second solvent from the porous substrate;
wherein a polymer of the at least one polymer is polyvinyl alcohol (PVA), polyethylene oxide (PEO), or polyethylene glycol
(PEG).

US Pat. No. 9,892,290

SYSTEMS AND METHODS OF USING MAGNETIZATION TO AUTHENTICATE PRODUCTS

Spectra Systems Corporati...

1. A method for authenticating a product using a magnetic code, comprising;
detecting a magnetic code encoded within a magnetizable material on the product using a personal computing device comprising
a sensor and having a surface substantially covered in a material having a high magnetic permittivity with an opening in the
surface adjacent to the sensor;

correlating the detected magnetic code to a symbolic code;
determining whether the symbolic code matches a symbolic code stored in a database; and
receiving, by the personal computing device, a signal indicating that the consumer product is authentic if the symbolic code
matches the symbolic code stored in the database.

US Pat. No. 9,839,947

SYSTEM FOR CLEANING PHOTO CATALYTIC BANKNOTES

SPECTRA SYSTEMS CORPORATI...

1. A method for cleaning a substrate material comprising:
scanning said substrate to determine fitness data relating thereto said substrate having a photocatalytic material on or about
said substrate;

making a decision based on said fitness data to clean the substrate;
applying excitation energy having a wavelength in the 200 nm-400 nm region to excite said photo-catalytic material and initiate
photo-catalysis oxidizing contaminants at the surface of the substrate thereby loosening all encrusted material;

washing said loosened material; and
rescanning said substrate to determine whether to return the substrate to circulation or to reject or destroy the substrate.
US Pat. No. 9,789,069

AUTHENTICATABLE COATINGS FOR PHARMACEUTICAL TABLETS AND INGESTIBLE MATERIALS

Spectra Systems Corporati...

1. A coating for an ingestible material comprising:
a substrate;
a first coating applied onto said substrate said coating having a first plurality of substantially spherical particles suspended
therein, the particles having a first dimension that equals a fraction of a wavelength that will satisfy a Bragg scattering
condition, wherein the particles self-arrange during application to define a plurality of lattices that selectively diffract
electromagnetic radiation and wherein each of the plurality of particles comprise a generally recognized as safe material.

US Pat. No. 10,140,494

PHOTOLUMINESCENT AUTHENTICATION DEVICES, SYSTEMS, AND METHODS

Spectra Systems Corporati...

1. A system for authenticating an item, the system comprising:a photoluminescent material disposed on or in a substrate and capable of absorbing an incident radiation from a radiation source and emitting an emitted radiation having a spectral signature with a decay time after removal of the radiation source; and
a photoauthentication device capable of being disposed in contact with the substrate, the photoauthentication device comprising:
the radiation source configured to provide the incident radiation to the photoluminescent material; and
a camera configured to measure the emitted radiation from the photoluminescent material at predefined time intervals during the decay time;
wherein, in connection with providing the incident radiation and measuring the emitted radiation, the photoauthentication device is translated across the substrate while the photoauthentication device is disposed in contact with the substrate; and
wherein after the photoauthentication device is translated across or over the substrate and the radiation source is not providing the incident radiation, the photoauthentication device is static with respect to the substrate and the camera is disposed over the photoluminescent material emitting the emitted radiation when the emitted radiation is measured.

US Pat. No. 10,082,454

DEVICE AND METHOD FOR GASOCHROMIC POROSITY SENSING

Spectra Systems Corporati...

1. An apparatus for testing a porosity of an object, comprising:a fluid source;
a gasochromic material;
an excitation source configured to excite the gasochromic material; and
a detection device configured to sense changes in emissions from the gasochromic material after it is contacted with the fluid and excited by the excitation source;
wherein the object is configured to be disposed between the fluid source and the gasochromic material such that when the fluid is emitted from the fluid source at least a portion of the fluid is configured to flow through the object before contacting the gasochromic material.

US Pat. No. 10,139,342

PHOTOLUMINESCENT AUTHENTICATION DEVICES, SYSTEMS, AND METHODS

Spectra Systems Corporati...

1. A system for authenticating an item, the system comprising:a label having a surface and comprising a photoluminescent material capable of absorbing an incident radiation from a radiation source and emitting an emitted radiation having a spectral signature with a decay time after removal of the radiation source; and
a photoauthentication device comprising:
the radiation source configured to provide the incident radiation directly proximate to the photoluminescent material; and
a camera configured to measure the emitted radiation directly proximate from the photoluminescent material at predefined time intervals during the decay time;
wherein the spectral signature includes spectral intensities for a first wavelength and a second wavelength at a first time in the decay time and spectral intensities for the first wavelength and the second wavelength at a second time in the decay time,
wherein the photoauthentication device is configured to communicate with an application to verify the authenticity of the item,
wherein the application is configured to report a result of verifying the authenticity of the item, and
wherein the photoauthentication device is configured to provide the incident radiation and measure the emitted radiation during a single motion of the photoauthentication device across the surface of the label.

US Pat. No. 10,169,691

COVERT COATING FOR AUTHENTICATION OF MATERIALS

Spectra Systems Corporati...

1. A security feature for authenticating an article comprising:at least one emitter material that generates a visible broad range emission within an emission band in response to a first excitation; and
at least one absorber material that upon exposure to said first excitation absorbs a non-visibly detectable portion of said broad range emission and upon exposure to a second excitation within said emission band and at a wavelength different than said first excitation absorbs a different non-visibly detectable portion of said broad range emission creating a non-visibly detectable spectral response shift in said broad emission range,
wherein said non-visibly detectable shift in spectral response is a machine detectable shift in a spectral characteristic of said emission.