Light Signatures, Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5023923 Programmable sensor apertureExpiredFeb 11, 87Jun 11, 91[G06K]
4916294 System for reliable digital recording on unreliable magnetic mediaExpiredJul 25, 88Apr 10, 90[G06K]
4837840 System for verifying authenticity of various articlesExpiredFeb 26, 87Jun 06, 89[G06K]
4816824 Merchandise verification and information systemExpiredNov 30, 87Mar 28, 89[H04Q, G06K]
4811408 Image dissecting document verification systemExpiredNov 13, 87Mar 07, 89[G06K]
4806740 Magnetic characteristic identification systemExpiredSep 19, 86Feb 21, 89[G06K]
4807287 Document authentication methodExpiredApr 06, 87Feb 21, 89[G06F, H04K]
4748679 Weighted-pixel characteristic sensing systemExpiredJul 25, 86May 31, 88[G06K]
4739322 Merchandise verification and information systemExpiredDec 31, 86Apr 19, 88[H04Q, G06K]
4734695 Secure card and sensing systemExpiredAug 25, 86Mar 29, 88[H04Q, G06K]
4723071 Anticounterfeit card-sensing mechanismExpiredMay 08, 85Feb 02, 88[G06K]
4721298 Bi-stable paper separatorExpiredAug 29, 86Jan 26, 88[B65H]
4689477 Verification system for document substance and contentExpiredOct 02, 85Aug 25, 87[G06K]
4686527 Verification system for document substance and contentExpiredNov 12, 85Aug 11, 87[H04Q, G06K]
4675669 System of issuing secure documents of various denominationExpiredJul 11, 85Jun 23, 87[H04Q, G06K]
4663622 Non-counterfeitable document systemExpiredApr 29, 85May 05, 87[G06F, G06K]
4656473 Secure card and sensing systemExpiredOct 04, 84Apr 07, 87[H04Q]
4651150 Merchandise verification and information systemExpiredJul 08, 85Mar 17, 87[H04Q, G06K]
4635054 Operator interactive device verification systemExpiredJul 10, 85Jan 06, 87[H04Q, G06K]
4630845 Authentication document systemExpiredAug 25, 83Dec 23, 86[G07D, B42D]

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