Dempster Systems Inc.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4759257 Power unit particularly for refuse container packer mechanismExpiredJan 27, 87Jul 26, 88[F15B]
4745952 Structure and method for handling hazardous waste materialsExpiredJan 20, 87May 24, 88[B65B]
D294586 Trash compaction bodyExpiredJul 22, 85Mar 08, 88[]
4665649 Gate operator and latch mechanism for refuse containerExpiredMay 06, 85May 19, 87[E05F]
4647267 Fork and arm mechanism for refuse containerExpiredMay 06, 85Mar 03, 87[B65F]
4455118 Opposed cylinder cable hoist mechanismExpiredSep 18, 81Jun 19, 84[B60P]
4410207 Bumper structure for vehicle having tiltable load carrier memberExpiredDec 21, 81Oct 18, 83[B60R]
4406474 Vehicle fender attachment and support structureExpiredMay 18, 81Sep 27, 83[B62D]
4396342 Swingably supported pusher actuator for refuse transporting vehicleExpiredSep 22, 80Aug 02, 83[B65F, F16H]
4349305 Lifting and dumping apparatusExpiredDec 29, 80Sep 14, 82[B65B]
4307541 Tail-gate operating and locking mechanismExpiredNov 30, 79Dec 29, 81[E05F]
4268053 Wheel fender assemblyExpiredAug 27, 79May 19, 81[B62D]

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