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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
RE33661 Head positioning assemblyExpiredJul 06, 90Aug 13, 91[G11B]
RE33224 Drive for end loading and transversely shifting tape cartridgeExpiredJun 15, 89May 29, 90[G11B]
4833558 Head positioning assemblyExpiredApr 25, 86May 23, 89[G11B]
4809099 Transport for tape cartridge with leader blockExpiredMay 16, 88Feb 28, 89[G11B]
4807067 Cartridge tape driveExpiredFeb 02, 87Feb 21, 89[G11B]
4796110 System and method for encoding and storing digital information on magnetic tapeExpiredFeb 18, 86Jan 03, 89[H03M, G11B]
4785363 Cartridge alignment mechanism for tape driveExpiredMar 24, 86Nov 15, 88[G11B]
4779251 Optical disk memory system with closed loop micro-jump between adjacent tracksExpiredJun 12, 87Oct 18, 88[G11B]
4763314 Linear actuator for an optical disk storage apparatusExpiredAug 13, 86Aug 09, 88[G11B]
4747004 Magnetic head positioning apparatusExpiredApr 07, 86May 24, 88[G11B]
4717866 Stepping motor excitation sequencesExpiredApr 23, 86Jan 05, 88[H02P]
4704645 Transport for tape cartridge with leader blockExpiredNov 01, 85Nov 03, 87[G11B]
D291797 Electric motor housingExpiredDec 18, 84Sep 08, 87[]
4677508 Endwise loaded cartridge tape driveExpiredFeb 24, 86Jun 30, 87[G11B]
4672613 System for transferring digital data between a host device and a recording mediumExpiredNov 01, 85Jun 09, 87[G06F]
4647994 Miniaturized cartridge-type tape drive for data processorsExpiredMar 13, 84Mar 03, 87[G11B]
4646175 Method and apparatus for positioning transducers by digital conversion of analog-type signalsExpiredApr 05, 84Feb 24, 87[G11B]
4644420 Circuit and methodology for reading and tracking binary data from magnetic tape independently of the data pattern on the tapeExpiredMar 29, 84Feb 17, 87[H03D, G11B]
4609958 Precision bearing for reciprocating a magnetic headExpiredMay 29, 84Sep 02, 86[G11B]
4586094 Method and apparatus for pre-recording tracking information on magnetic mediaExpiredMar 13, 84Apr 29, 86[G11B]

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