Memorex Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5070423 High-performance actuator array for disk drive with unitary actuator guide meansExpiredMar 06, 86Dec 03, 91[G11B]
5025327 Magnetic disk write precompensation method and apparatus which takes into account variations in head/disk characteristicsExpiredOct 17, 86Jun 18, 91[G11B]
4880180 Tape reelExpiredJul 25, 88Nov 14, 89[B65H]
4861655 Thermoplastic magnetic coating compositionExpiredSep 08, 86Aug 29, 89[G11B]
4822637 Fabrication of magnetic recording medium with lubricantExpiredNov 07, 86Apr 18, 89[G11B]
4797303 Surface lubricants for disc recordExpiredSep 04, 85Jan 10, 89[B05D, G11B, B32B]
4736845 "Brake/hold down" plug for computer tape reel closureExpiredNov 18, 85Apr 12, 88[B65D]
4730226 Actuator carriage with "splayed-bearing" arrayExpiredJan 06, 86Mar 08, 88[G11B]
4686146 Radiation-cured recording composition with bi-part lubeExpiredFeb 18, 86Aug 11, 87[G11B]
4670806 Self loading slider for magnetic recording headsExpiredMar 14, 80Jun 02, 87[G11B]
4659627 Magnetic recording medium with lubricantExpiredOct 17, 84Apr 21, 87[G11B]
4657816 Ferromagnetic recording materialsExpiredApr 19, 82Apr 14, 87[B05D]
4644641 Fabrication of "Delta" magnetic head-slidersExpiredDec 30, 85Feb 24, 87[G11B]
4642541 Track following servo for higher density disk filesExpiredOct 20, 83Feb 10, 87[G05B]
4616277 Disk drive storage system having means for compensating for seek driving forces coupled between head actuatorsExpiredJun 15, 84Oct 07, 86[G11B]
4612517 Signal simulator for magnetic recording headExpiredMay 23, 84Sep 16, 86[H03B]
4612586 Method for measuring timing asymmetry in a magnetic storage systemExpiredJun 05, 84Sep 16, 86[G11B]
4587714 Manufacture of motor with split back magnet arrayExpiredJan 03, 84May 13, 86[H04R]
4581664 Disk accessing circuitryExpiredSep 21, 83Apr 08, 86[G11B]
4577244 Techniques for disk servoExpiredDec 12, 83Mar 18, 86[G11B]

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