Assignee
SPECTRA SYSTEMS CORP
US39 patents
Top patents by PatentIndex Score
US6948068B2Sep 20, 2005
Method and apparatus for reading digital watermarks with a hand-held reader device
SPECTRA SYSTEMS CORP92 citations98
US6874639B2Apr 5, 2005
Methods and apparatus employing multi-spectral imaging for the remote identification and sorting of objects
SPECTRA SYSTEMS CORP98 citations98
US6552290B1Apr 22, 2003
Optically-based methods and apparatus for performing sorting coding and authentication using a gain medium that provides a narrowband emission
SPECTRA SYSTEMS CORP77 citations98
US6441380B1Aug 27, 2002
Coding and authentication by phase measurement modulation response and spectral emission
SPECTRA SYSTEMS CORP60 citations96
US7184569B2Feb 27, 2007
Marking articles using a covert digitally watermarked image
SPECTRA SYSTEMS CORP37 citations95
US6795464B2Sep 21, 2004
Temperature control of laser action in scattering media
SPECTRA SYSTEMS CORP45 citations93
US6488155B2Dec 3, 2002
Methods and apparatus employing multi-spectral imaging for the remote identification and sorting of objects
SPECTRA SYSTEMS CORP35 citations93
US6489892B2Dec 3, 2002
Use of evaporatively activated color change for verifying the integrity of an object, such as a data storage medium or a gaming token
SPECTRA SYSTEMS CORP46 citations93
US7529385B2May 5, 2009
Marking articles using a covert digitally watermarked image
SPECTRA SYSTEMS CORP28 citations92
US7220535B2May 22, 2007
Marking and authenticating articles
SPECTRA SYSTEMS CORP24 citations91
US6908505B2Jun 21, 2005
Thermochromic compositions of color formers and lewis acids
SPECTRA SYSTEMS CORP15 citations91
US10140494B1Nov 27, 2018
Photoluminescent authentication devices, systems, and methods
SPECTRA SYSTEMS CORP9 citations83
US7149231B2Dec 12, 2006
Monolithic, side-pumped, passively Q-switched solid-state laser
SPECTRA SYSTEMS CORP15 citations82
US7393623B2Jul 1, 2008
Incorporation of markings in optical media
SPECTRA SYSTEMS CORP15 citations80
US7963450B2Jun 21, 2011
Near infrared ink security feature
SPECTRA SYSTEMS CORP18 citations78
US10082454B2Sep 25, 2018
Device and method for gasochromic porosity sensing
SPECTRA SYSTEMS CORP2 citations73
US9610619B2Apr 4, 2017
Supercritical fluid cleaning of banknotes and secure documents
SPECTRA SYSTEMS CORP3 citations73
US8961702B2Feb 24, 2015
Supercritical fluid cleaning of banknotes and secure documents
SPECTRA SYSTEMS CORP4 citations73
US11501593B2Nov 15, 2022
Machine-readable polymer security threads
SPECTRA SYSTEMS CORP2 citations72
US11007288B1May 18, 2021
Heat treatment of banknotes in an oxygen-free environment
SPECTRA SYSTEMS CORP2 citations72
US9676009B2Jun 13, 2017
Supercritical fluid cleaning of banknotes and secure documents
SPECTRA SYSTEMS CORP3 citations72
US6881915B2Apr 19, 2005
Contrast enhancing marking system for application of unobtrusive identification and other markings
SPECTRA SYSTEMS CORP6 citations72
US6384920B1May 7, 2002
Self-targeting reader system for remote identification
SPECTRA SYSTEMS CORP9 citations70
US12227022B2Feb 18, 2025
Patterned conductive layer for secure instruments
SPECTRA SYSTEMS CORP0 citations61
US11957800B2Apr 16, 2024
Heat treatment of banknotes in an oxygen-free environment
SPECTRA SYSTEMS CORP0 citations61
US10796120B2Oct 6, 2020
Photoluminescent authentication devices, systems, and methods
SPECTRA SYSTEMS CORP1 citations61
US9475334B2Oct 25, 2016
Gasochromic fibers and inclusions for security articles
SPECTRA SYSTEMS CORP1 citations61
US6744525B2Jun 1, 2004
Optically-based system for processing banknotes based on security feature emissions
SPECTRA SYSTEMS CORP5 citations59
US10354471B2Jul 16, 2019
Device and method for using gasochromic sensing for evaluating fitness
SPECTRA SYSTEMS CORP0 citations52
US9970854B2May 15, 2018
Nondegenerate two-wave mixing for identifying and separating macromolecules
SPECTRA SYSTEMS CORP0 citations52
US9789069B2Oct 17, 2017
Authenticatable coatings for pharmaceutical tablets and ingestible materials
SPECTRA SYSTEMS CORP0 citations52
US11747268B2Sep 5, 2023
Coded polymer substrates for banknote authentication
SPECTRA SYSTEMS CORP0 citations51
US11263856B2Mar 1, 2022
Coded polymer substrates for banknote authentication
SPECTRA SYSTEMS CORP0 citations51
US10839634B2Nov 17, 2020
Taggant system
SPECTRA SYSTEMS CORP0 citations51
US9892290B2Feb 13, 2018
Systems and methods of using magnetization to authenticate products
SPECTRA SYSTEMS CORP0 citations51
US9777437B2Oct 3, 2017
Systems and methods for reversing banknote limpness
SPECTRA SYSTEMS CORP0 citations51
US8932409B2Jan 13, 2015
Supercritical fluid cleaning of banknotes and secure documents
SPECTRA SYSTEMS CORP1 citations51
US10139342B2Nov 27, 2018
Photoluminescent authentication devices, systems, and methods
SPECTRA SYSTEMS CORP0 citations40
US11629290B2Apr 18, 2023
Lanthanide metal chelate security feature
SPECTRA SYSTEMS CORP0 citations31