Nishimu Electronics Industries Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5237208 Apparatus for parallel operation of triport uninterruptable power source devicesExpiredOct 07, 91Aug 17, 93[H02J]
5019770 Switching power source device having energy recoveryExpiredOct 24, 89May 28, 91[H02M, G05F]
4926302 Switching power source deviceExpiredApr 28, 88May 15, 90[H02M]
4893069 Ferroresonant three-phase constant AC voltage transformer arrangement with compensation for unbalanced loadsExpiredMay 30, 89Jan 09, 90[G05F]
4862059 Ferroresonant constant AC voltage transformerExpiredJun 29, 88Aug 29, 89[G05F]
4800476 PWM inverter with a saturable coreExpiredSep 10, 87Jan 24, 89[H02M]
4786854 Alternating current voltage regulator using a feedback loop with step filteringExpiredSep 24, 87Nov 22, 88[G05F]
4772994 Power source using high-frequency phase controlExpiredSep 10, 87Sep 20, 88[H02M]
4665322 Uninterruptible polyphase AC power supplyExpiredOct 29, 85May 12, 87[H02J, H02M]
4642549 Ferroresonant constant AC voltage regulatorExpiredAug 12, 85Feb 10, 87[H02J]
4626983 Power conversion device for solar cellExpiredSep 26, 84Dec 02, 86[H02M]
4556802 Uninterruptible ac power supplyExpiredFeb 24, 84Dec 03, 85[H02J]

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