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Patent Activity in the Last 10 Years


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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
2005/0213,466 Data recording cartridge of the anti-compromise kind and associated anti-compromise processingABANFeb 16, 05Sep 29, 05[G11B]
6796813 Data storage or recording device and process for hermetically connecting a data recording and storage cartridge and receptacleExpiredJun 07, 00Sep 28, 04[H01R]
6091588 Magnetic tape recorder having a capacitive coupling device in the form of fixed and mobile rings or ring segmentsExpiredJan 19, 98Jul 18, 00[G11B]
5392507 Method of positioning magnetic heads on a turntableExpiredAug 20, 93Feb 28, 95[G11B]
5359482 Magnetic head having a system of windings for compensating magnetic leakageExpiredFeb 28, 94Oct 25, 94[G11B]
5287236 Method and apparatus for recording and/or reading information on a magnetic tapeExpiredJun 11, 92Feb 15, 94[G11B]
5183219 Coupling for axially locking a reel of a tape cassette and for driving it without backlashExpiredMay 22, 91Feb 02, 93[B65H]
5107505 Circuit of encoding and formatting data for rotating head recordersExpiredJul 06, 89Apr 21, 92[G06F]
5038234 Tape drive device for a magnetic recorderExpiredMay 18, 89Aug 06, 91[C11B]
4939612 Tape guide device for a magnetic recorder/readerExpiredFeb 21, 89Jul 03, 90[G11B]
4910615 Capacitance sensor for detecting the position of magnetic rotating headsExpiredDec 21, 87Mar 20, 90[G11B]
4881072 Device for remote meteringExpiredMar 09, 87Nov 14, 89[H04Q]
4870522 Rotary electric coupling device for a rotating head recorderExpiredJun 02, 88Sep 26, 89[G11B]
4868774 Digital waveform generator and associated methodExpiredDec 28, 88Sep 19, 89[H03M]
4852026 Method and apparatus for the evaluation of an angle over an extended rangeExpiredJun 25, 86Jul 25, 89[G01B]
4833414 Method and apparatus for the identification of a faulty conductor in a multiple supply lineExpiredDec 03, 86May 23, 89[G01R]
4797846 Digital resonant filterExpiredMay 17, 85Jan 10, 89[G06F]
4796225 Programmable dynamic shift register with variable shift controlExpiredMay 17, 85Jan 03, 89[G06F]
4780908 Method and apparatus for signal transmission regulation in differential protectionExpiredJun 16, 86Oct 25, 88[H04B]
4763103 Process and method for wide band transmission, particularly for data transmission over an electricity distribution networkExpiredFeb 13, 86Aug 09, 88[H04M]

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