Canadian General Electric Company Limited

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4699524 Supplementary cooling system for thrust bearingExpiredFeb 09, 87Oct 13, 87[F16C]
4657411 Hydraulically supported thrust bearingsExpiredAug 25, 86Apr 14, 87[F16C]
4635769 Gear protection system for grinding millsExpiredMar 07, 86Jan 13, 87[F16D]
4636910 Varistor overvoltage protection system with temperature systemsExpiredApr 30, 85Jan 13, 87[H02H]
4633574 Method for securing conductor bar in machine slot while closing slotExpiredMar 29, 85Jan 06, 87[H02K]
4605925 Infra-red telemetry systemExpiredJun 15, 84Aug 12, 86[G08C]
4594880 Apparatus for determining finished roll density in a millExpiredDec 27, 84Jun 17, 86[G01N]
4572978 Commutator stud vibration damping arrangementExpiredJul 06, 84Feb 25, 86[H02K]
4573132 Thermal model for electrical apparatusExpiredApr 25, 83Feb 25, 86[G06F, H02H]
4561599 Mill load sensing systemExpiredNov 16, 83Dec 31, 85[B02L]
4556826 Inching supply torque controlExpiredAug 22, 84Dec 03, 85[H02P]
4556830 Speed controller for mill drives and the likeExpiredSep 19, 84Dec 03, 85[H02P]
4547690 Flexible stator slot closure arrangementExpiredFeb 15, 84Oct 15, 85[H02K]
4538769 Grinding mill constructionExpiredJun 07, 83Sep 03, 85[B02C]
4538202 Current transformer secondary voltage limiterExpiredFeb 23, 84Aug 27, 85[H01H, H02H]
4520910 Grinding mill control using controlled pulsing of air clutchesExpiredDec 09, 82Jun 04, 85[B60K, F16H]
4510548 Rotor protection apparatus and methodExpiredFeb 01, 84Apr 09, 85[H02H]
4496883 Electric inching impulse controlExpiredDec 01, 83Jan 29, 85[H02P]
4491767 Synchronizing synchronous motors, motors prior to clutch closureExpiredDec 19, 83Jan 01, 85[H02P]
4475139 Thyristor-switched capacitor apparatusExpiredDec 30, 81Oct 02, 84[H02H]

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