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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5194787 Control circuit for an electric motor without a collectorExpiredNov 13, 90Mar 16, 93[H02P]
5053667 Di- or polyphase synchronous electric motor with a disc-shaped rotorExpiredFeb 09, 90Oct 01, 91[H02K]
5003686 Method of manufacturing a synchronous electric motor with magnetized rotarExpiredJul 03, 89Apr 02, 91[H02K]
4908592 Electromagnetic actuating deviceExpiredFeb 01, 88Mar 13, 90[H01F]
4891538 Synchronous motor with sinusodial torque variation in each phaseExpiredJun 24, 88Jan 02, 90[H02K]
4866323 Synchronous electric motor with magnetised rotor and method of manufacturing this motorExpiredAug 06, 87Sep 12, 89[H02K]
4823040 Single-stage, two-phase of four-phase synchronous electric motorExpiredAug 11, 87Apr 18, 89[H02K]
4791331 Brush assembly for electric commutator motorsExpiredApr 14, 87Dec 13, 88[H01R]
4737753 Multipolar magnetization deviceExpiredOct 21, 85Apr 12, 88[H01F]
4714854 Electric motor with a multipolar permanent magnet rotorExpiredJun 30, 86Dec 22, 87[H02K]
4707677 Multipolar magnetization deviceExpiredNov 29, 85Nov 17, 87[H01F]
4682067 Synchronous electric motor having a disc-shaped permanent magnet rotorExpiredMay 07, 86Jul 21, 87[H02K]
4658166 Synchronous electric motor with disc-shaped permanent magnet rotorExpiredMay 08, 86Apr 14, 87[H02K]
4629916 Method and apparatus for harmonics suppression in motor systemsExpiredMar 20, 85Dec 16, 86[H02K]
4587387 Electric switch with prebiased contact springExpiredMar 07, 84May 06, 86[H01H]
4543507 Self-supporting rotor coil for dc-machineExpiredJul 01, 81Sep 24, 85[H02K]
4521723 Method and device for braking an assembly comprising a two-phase synchronous motorExpiredApr 03, 84Jun 04, 85[H02P]
4518883 Electric motor with permanent magnet rotorExpiredAug 03, 83May 21, 85[H02K]
4517478 Electric stepper motorExpiredApr 03, 84May 14, 85[H02K]
4516064 Stepper motor control deviceExpiredFeb 15, 83May 07, 85[H02K]

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