AKAI ELECTRIC CO., LTD.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5636076 Automatic recording current controller of magnetic recorderExpiredMay 24, 95Jun 03, 97[H04N, G11B]
5446539 Magnetic recording and reproducing device with selective line noise cancelingExpiredMar 04, 94Aug 29, 95[H04N]
5416641 Magnetic recording/reproducing apparatus including a switch for selectively supplying a reference signal to the recording unitExpiredSep 15, 92May 16, 95[G11B]
5400149 Magnetic recording apparatus having improved detail emphasis circuitExpiredSep 15, 92Mar 21, 95[H04N]
5386726 Vibratory gyroscopeExpiredOct 02, 90Feb 07, 95[G01P]
5257109 Magnetic recording and reproducing apparatusExpiredJun 28, 91Oct 26, 93[H04N]
5249064 Noise canceller for use in a magnetic reproducing apparatusExpiredSep 15, 92Sep 28, 93[H04N]
5111346 FM audio record reproducing apparatus having circuitry for preventing discontinuities during channel switching or switching of read headsExpiredJul 18, 89May 05, 92[G11B]
4961017 Stator for use in a brushless motorExpiredSep 26, 88Oct 02, 90[H02K]
4859977 Insulator device for power transformerExpiredOct 26, 88Aug 22, 89[H01F]
4696306 Electrocardiogram playback system and methodExpiredNov 20, 86Sep 29, 87[A61B, G01D]
4604747 Error correcting and controlling systemExpiredMay 14, 84Aug 05, 86[G06F]
4409633 Mn-Zn Single crystalline ferrite head and a method of making the sameExpiredApr 03, 81Oct 11, 83[G11B]
4285894 Mn-Zn single crystalline ferrite head and a method of making the sameExpiredMar 08, 79Aug 25, 81[C04B]

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