TANKNOLOGY/ENGINEERED SYSTEMS, INC., A CORP. OF DE.,(DBA ENGINEERED SYSTEMS, INC.)

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4591704 Data scrambling system and methodExpiredApr 18, 83May 27, 86[G06K]
4573192 End of transaction control systemExpiredJan 16, 84Feb 25, 86[G06K]
4362928 Universal document format systemExpiredJan 12, 81Dec 07, 82[G06K]
4335448 Electronic control systemExpiredApr 06, 81Jun 15, 82[G06F]
4296315 Card reader security systemExpiredApr 16, 79Oct 20, 81[G06K]
4296404 Remote verification lockout systemExpiredOct 18, 79Oct 20, 81[H04Q, G06K]
4273996 Sequential card reader systemExpiredJun 25, 79Jun 16, 81[G06K]
4234920 Power failure detection and restart systemExpiredNov 24, 78Nov 18, 80[G06F, G11C]
4230989 Communications system with repeater stationsExpiredMay 11, 79Oct 28, 80[H04B]

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