Transitions Research Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5103306 Digital image compression employing a resolution gradientExpiredMar 28, 90Apr 07, 92[H04N]
5063604 Method and means for recognizing patterns represented in logarithmic polar coordinatesExpiredNov 08, 89Nov 05, 91[G06K]
5051906 Mobile robot navigation employing retroreflective ceiling featuresExpiredJun 07, 89Sep 24, 91[G06F]
5040116 Visual navigation and obstacle avoidance structured light systemExpiredJun 20, 90Aug 13, 91[G06F]
4979136 Processing system and method for enhancing image dataExpiredMar 01, 88Dec 18, 90[G06F]
4967862 Tether-guided vehicle and method of controlling sameExpiredMar 13, 89Nov 06, 90[B62D, B60L]
4968878 Dual bumper-light curtain obstacle detection sensorExpiredDec 28, 89Nov 06, 90[G01V]
4962453 Autonomous vehicle for working on a surface and method of controlling sameExpiredFeb 07, 89Oct 09, 90[G06F]
4958068 Dual bumper-light curtain obstacle detection sensorExpiredJul 28, 89Sep 18, 90[G01V]
4954962 Visual navigation and obstacle avoidance structured light systemExpiredSep 06, 88Sep 04, 90[G06F]
4951985 Bumper for impact detectionExpiredNov 01, 88Aug 28, 90[B60R]
4932489 Steering and drive means for robot vehicleExpiredApr 07, 88Jun 12, 90[B62D]
4933864 Mobile robot navigation employing ceiling light fixturesExpiredOct 04, 88Jun 12, 90[G06F, G06E, G01C]
4905151 One dimensional image visual system for a moving vehicleExpiredMar 07, 88Feb 27, 90[G06F]

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