SPERRY RAND CORPORATION

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4481580 Distributed data transfer control for parallel processor architecturesExpiredJan 27, 83Nov 06, 84[G06F]
4442425 Passive fiber optic keyboardExpiredNov 13, 81Apr 10, 84[G08C, G06F]
4437157 Dynamic subchannel allocationExpiredApr 20, 81Mar 13, 84[G06F]
4425627 Intelligent prompting terminal apparatusExpiredFeb 23, 81Jan 10, 84[G08C, G06F]
4419629 Automatic synchronous switch for a plurality of asynchronous oscillatorsExpiredJun 25, 80Dec 06, 83[H03K]
4413196 Three Josephson junction direct coupled isolation circuitExpiredAug 31, 81Nov 01, 83[H03K]
4413197 Four Josephson junction direct-coupled and gate circuitExpiredAug 31, 81Nov 01, 83[H03K]
4405406 Plasma etching process and apparatusExpiredJun 09, 82Sep 20, 83[H01L, C03C, B44C]
4394160 Making magnetic powdersExpiredDec 03, 79Jul 19, 83[H01F, C22C]
4394592 Long stroke linear actuatorExpiredSep 29, 80Jul 19, 83[H02K]
4386401 High speed processing restarting apparatusExpiredJul 28, 80May 31, 83[G06F]
4384919 Method of making x-ray masksExpiredJul 25, 80May 24, 83[C03C, B44C]
4381550 High speed dividing circuitExpiredOct 29, 80Apr 26, 83[G06F]
4360912 Distributed status reporting systemExpiredNov 23, 79Nov 23, 82[H04J]
4357609 Noncoherent two way ranging apparatusExpiredAug 25, 80Nov 02, 82[G01S]
4348705 Random access flexible disk memoryExpiredMay 07, 80Sep 07, 82[G11B]
4334287 Buffer memory arrangementExpiredApr 12, 79Jun 08, 82[G06F]
4327905 Duplex copying apparatusExpiredSep 30, 80May 04, 82[B65H]
4327423 Magnetic bubble transducerExpiredJul 21, 80Apr 27, 82[G11C]
4326291 Error detection systemExpiredApr 11, 79Apr 20, 82[G06F]

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