Electro-Craft Corporation

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4651068 Brushless motor control circuitry with optimum current vector controlExpiredOct 01, 84Mar 17, 87[H02P]
4498037 Velocity servo controllerExpiredSep 22, 83Feb 05, 85[G05B]
4426606 Emergency stop device for brushless motorsExpiredNov 08, 82Jan 17, 84[H02P]
4417141 Optical shaft angle encoderExpiredJun 10, 81Nov 22, 83[G01P]
4322646 Flux focussed DC motor and method for assemblyExpiredFeb 29, 80Mar 30, 82[H02K]
4285595 Modular encoderExpiredJul 27, 79Aug 25, 81[G01D]
4208621 Brushless DC motor control systemExpiredJun 30, 78Jun 17, 80[H02K]
4184071 Modular encoderExpiredJan 12, 78Jan 15, 80[G01D]

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