Yaskawa Electric Mfg. Co., Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5027049 Method for increasing the speed of an alternating current motorExpiredJan 31, 89Jun 25, 91[H02P]
4965847 Method and apparatus for detecting deviation of motor speed from frequency of power supplyExpiredJan 31, 89Oct 23, 90[G05B]
4953053 Method and apparatus for detecting mechanical overload of a hoistExpiredJan 31, 89Aug 28, 90[H02H]
4947088 Method and apparatus for controlling reel tensionExpiredJan 14, 88Aug 07, 90[H02P, B65H]
4789943 Thread cutting control methodExpiredOct 20, 86Dec 06, 88[G06F]
4761596 Method of detecting and controlling work start point of robotExpiredMay 30, 86Aug 02, 88[G05B]
4745563 Method of detecting the speed of a motorExpiredFeb 15, 85May 17, 88[G05B, G06F]
4743822 Servo motor control method and apparatusExpiredOct 10, 86May 10, 88[G05B]
4728974 Apparatus for supporting an imaging deviceExpiredMay 30, 86Mar 01, 88[G03B]
4720661 Method and apparatus for controlling reel tensionExpiredSep 12, 85Jan 19, 88[H02P, B65H]
4677276 Method of welding robot control which controls the three basic axes of a robot to provide a repetition of a weaving pattern along a robot locusExpiredNov 23, 82Jun 30, 87[B23K]
4590577 Welding robot controlling methodExpiredDec 01, 82May 20, 86[B23R]
4529352 Cable support of a robotExpiredApr 11, 84Jul 16, 85[B25J]
4507042 Cable support of a robotExpiredOct 05, 82Mar 26, 85[B25J]
4492906 Electric motorExpiredOct 08, 81Jan 08, 85[G01L]
4488023 Rotary-arc type gas-filled switchExpiredDec 20, 82Dec 11, 84[H01H]
4461936 Contact sensing deviceExpiredMar 18, 82Jul 24, 84[H01H]
4322669 Device for controlling the feed of machine toolsExpiredJul 05, 79Mar 30, 82[G05B]

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