Inventor
OKAYAMA TSUTOMU
JP13 patents
⚠️ This page may combine multiple inventors who share the name “OKAYAMA TSUTOMU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
7 patentsUS4362060ADec 7, 1982
Displacement transducer
HITACHI LTD33 citations89
US4264889AApr 28, 1981
Pressure transducer
HITACHI LTD20 citations81
US4173148ANov 6, 1979
Semiconductor strain gauge with temperature compensator
HITACHI LTD27 citations81
US5224026AJun 29, 1993
Alternatable constant current circuit
HITACHI LTD7 citations73
US4570498AFeb 18, 1986
Differential pressure measuring transducer assembly
HITACHI LTD12 citations73
US4507600AMar 26, 1985
Two-terminal current regulator
HITACHI LTD8 citations73
US4071823AJan 31, 1978
Two-wire type amplifier
HITACHI LTD8 citations73
NGK SPARK PLUG CO
5 patentsUS5347193ASep 13, 1994
Spark plug having an erosion resistant tip
NGK SPARK PLUG CO61 citations96
US5869921AFeb 9, 1999
Spark plug for internal combustion engine having platinum and iridium alloyed emissive tips
NGK SPARK PLUG CO24 citations92
US5440198AAug 8, 1995
Spark plug having a noble metal firing tip bonded to a front end of a center electrode
NGK SPARK PLUG CO49 citations92
US5320569AJun 14, 1994
Method of making a spark plug
NGK SPARK PLUG CO28 citations92
US5273474ADec 28, 1993
Method of manufacturing a center electrode for a spark plug
NGK SPARK PLUG CO49 citations92