SEQUEL, INC., A CA CORP.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4881139 Latch mechanism for rotary actuator and the likeExpiredApr 14, 88Nov 14, 89[G11B]
4856011 Semiconductor laser control circuitExpiredNov 08, 88Aug 08, 89[G01J, H01S]
4843503 Head arm damping device for disc drive actuatorsExpiredDec 17, 87Jun 27, 89[G11B]
4833667 Spindle motor assembly for low acoustic noise environmentsExpiredDec 17, 87May 23, 89[G11B]
4764828 Disc and hub centering device for use in magnetic disc drivesExpiredMar 26, 87Aug 16, 88[G11B]
4703377 Thermal compensation for disk drive carriage assemblyExpiredFeb 06, 86Oct 27, 87[G11B]
4703470 Dynamic absorber device for use with disk drivesExpiredAug 15, 85Oct 27, 87[G11B]
4697098 Composite gate generator circuit for detecting valid data signalsExpiredJun 10, 85Sep 29, 87[H03K, H04B]
4691254 Data processing system including encoder, decoder and write precompensator, using run length limited codeExpiredJun 24, 85Sep 01, 87[G11B]
4635151 Rotary actuator having preloaded spring crash stopExpiredJan 25, 85Jan 06, 87[G11B]
4631431 Linear motor having improved magnetic characteristicsExpiredJul 30, 84Dec 23, 86[H02K]
D286879 Magnetic disc drive housingExpiredApr 30, 84Nov 25, 86[]
RE32285 Linear actuator for a memory storage apparatusExpiredJun 13, 84Nov 11, 86[H02K, G11B]
4616275 Disc servo with 1F-2F servo patternExpiredOct 22, 84Oct 07, 86[G11B]
4595221 Disc transfer deviceExpiredOct 09, 84Jun 17, 86[B66C]
4594627 Safety latch for pickup heads and carriage disc driveExpiredJun 28, 83Jun 10, 86[H02K, G11B]
4415844 Digital motor speed controllerExpiredFeb 09, 81Nov 15, 83[H02P]
D266670 Magnetic disc driveExpiredMay 15, 80Oct 26, 82[D140]
4331989 Magnetic disc file having dual lock mechanismExpiredMay 15, 80May 25, 82[G11B]
4305105 Linear actuator for magnetic disc drive and the likeExpiredJun 16, 80Dec 08, 81[G11B]

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