Tohoku Metal Industries, Ltd.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4764698 A.C. electric motors having a stator forming orthogonal magnetic pathsExpiredMar 24, 86Aug 16, 88[H02K]
4758753 A.C. electric motors having a stator forming orthogonal magnetic pathsExpiredJan 26, 83Jul 19, 88[H02K]
4707196 Ti-Ni alloy articles having a property of reversible shape memory and a method of making the sameExpiredSep 06, 85Nov 17, 87[C22F]
4537645 Magnetically traceable explosives with stability and a method for the preparation thereofExpiredDec 27, 83Aug 27, 85[C06B]
4516101 Air-flow-rate sensorsExpiredFeb 22, 84May 07, 85[H01H]
4481431 Circuit for driving a switching transistorExpiredApr 19, 84Nov 06, 84[H03K]
4455179 Method for the preparation of magnetically traceable explosivesExpiredOct 26, 81Jun 19, 84[C06B]
4449173 Multi-output-type power supply devices using separately-exciting-type switching regulatorsExpiredMar 30, 82May 15, 84[H02M, G05F]
4420804 Switching regulator with base charge removal circuitExpiredAug 25, 81Dec 13, 83[H02P]
4419628 Transient-noise simulatorsExpiredMar 13, 81Dec 06, 83[H03K, G01R, H03H]
4417207 Circuit for injecting simulating-noise signals in a power lineExpiredMar 13, 81Nov 22, 83[H03K]
4396895 Multiple resonant electromechanical filters using edge-mode vibration of a long piezoelectric plateExpiredMay 21, 81Aug 02, 83[H03H]
4389628 Thermo-magnetically operated switches having two different operating temperaturesExpiredMay 29, 81Jun 21, 83[H01H]
4363678 Explosives having powdered ferrite magnet as a tracer dispersed therethrough and a method for producing the sameExpiredDec 17, 80Dec 14, 82[C06B]
4356421 Piezoelectric resonators of an energy-trapping type of a width extensional vibratory modeExpiredMar 09, 81Oct 26, 82[H01L]
4325042 Thermo-magnetically operated switches having two different operating temperaturesExpiredMay 13, 80Apr 13, 82[H01H]

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