SP-MARINE, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4806933 CW and pulse capable crystal video receiverExpiredAug 22, 86Feb 21, 89[G01S]
4777602 Digital autopilot controller for marine vesselsExpiredJun 26, 86Oct 11, 88[G06F, G05D]
4724432 Generation of graphic symbols for cathode ray tube displaysExpiredAug 15, 85Feb 09, 88[G09G]
4692868 Adaptive autopilotExpiredJan 18, 85Sep 08, 87[G06F, G05D]
4645992 Electronically controlled servomotor limit stopExpiredDec 24, 84Feb 24, 87[G05B]
4634858 Variable coupler fiberoptic sensorExpiredOct 17, 84Jan 06, 87[H01J]
4623966 Collision avoidance apparatusExpiredFeb 15, 84Nov 18, 86[G06F, G01S]
4551826 Multiple beam lens transducer with collimator for sonar systemsExpiredMar 08, 85Nov 05, 85[H04B]
4537382 Sway rod suspension systemExpiredFeb 04, 82Aug 27, 85[F16M]
4532637 Differential receiverExpiredJan 03, 83Jul 30, 85[G01S]
4517567 Radar trigger and pretrigger generator having delay sensing and compensating circuitExpiredFeb 25, 82May 14, 85[H03K]
4510496 Baseband radar docking systemExpiredFeb 08, 82Apr 09, 85[G01S]
4472978 Stabilized gyrocompassExpiredMay 29, 81Sep 25, 84[G01C]
4457006 Global positioning system receiverExpiredNov 16, 81Jun 26, 84[H04L]
4453165 Differential Doppler receiverExpiredJan 03, 83Jun 05, 84[G01S]
4450542 Multiple beam lens transducer for sonar systemsExpiredMar 05, 82May 22, 84[H04R]
D272608 Compass heading displayExpiredOct 30, 81Feb 14, 84[D100]
4430640 Step data to synchro converterExpiredJan 29, 81Feb 07, 84[H03K]
4409639 Solenoid driver circuitExpiredSep 28, 81Oct 11, 83[H01H]
4401932 Synchro-to-step data converterExpiredJan 29, 81Aug 30, 83[G05B]

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