SILVERMAN, RICHARD

Patent Owner

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Patent Activity in the Last 10 Years

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4464566 Access security controlExpiredSep 29, 82Aug 07, 84[G06K]
4395628 Access security controlExpiredFeb 12, 81Jul 26, 83[G06K]
4303852 Access security controlExpiredApr 23, 79Dec 01, 81[G08B, G06K]
4213038 Access security systemExpiredDec 20, 76Jul 15, 80[G07F, G06K]

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