Kabushiki Kaisha Suwa Seikosha

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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Expired/Abandoned/Withdrawn Patents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
5121272 Apparatus for centering the magnetic disc in a magnetic disc driveExpiredSep 08, 89Jun 09, 92[G11B]
5007015 Portable compact deviceExpiredOct 17, 88Apr 09, 91[G06F]
4903155 Disc driveExpiredFeb 28, 89Feb 20, 90[G11B]
4800417 Improved semiconductor device having a polycrystalline isolation regionExpiredJun 24, 82Jan 24, 89[H01L]
4745589 Objective lens actuator having movements restricting control means for an optical headExpiredOct 04, 85May 17, 88[G11B]
4701026 Method and circuits for driving a liquid crystal display deviceExpiredJun 11, 85Oct 20, 87[G02F]
4684960 Thermoelectric printing apparatusExpiredMar 25, 85Aug 04, 87[G01D]
4675224 Magnetic recording mediumExpiredDec 27, 82Jun 23, 87[G11B]
D289756 Television receiverExpiredNov 13, 84May 12, 87[]
4660030 Liquid crystal video display deviceExpiredMay 29, 84Apr 21, 87[G09G]
D289167 Electronic printerExpiredOct 09, 84Apr 07, 87[]
4646157 Pocket television receiversExpiredMay 04, 83Feb 24, 87[H04N]
4640582 System for driving a liquid crystal matrix display so as to avoid crosstalkExpiredMay 07, 84Feb 03, 87[G02F]
4629290 Liquid crystal compounds and method of preparationExpiredMar 22, 84Dec 16, 86[C09K, C07C, G02F]
4615625 Analog electronic timepieceExpiredApr 24, 84Oct 07, 86[G04B, G04F]
D285807 Electronic printerExpiredMay 18, 84Sep 23, 86[]
4609256 Liquid crystal optical deviceExpiredJul 23, 82Sep 02, 86[C09K, G02F]
4609267 Synthetic resin lens and antireflection coatingExpiredDec 22, 81Sep 02, 86[B05D, G02B, G02C]
4604555 Intensity modulation circuit for cathode-ray tubesExpiredAug 13, 84Aug 05, 86[H01J, G09G]
D284869 Electronic calculatorExpiredJul 17, 84Jul 29, 86[]

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