Inventor
KOYANAGI OSAMU
JP20 patents
⚠️ This page may combine multiple inventors who share the name “KOYANAGI OSAMU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
19 patentsUS5793597AAug 11, 1998
Puffer type gas breaker
HITACHI LTD26 citations91
US4939322AJul 3, 1990
Puffer type circuit breaker
HITACHI LTD24 citations90
US4434335AFeb 28, 1984
Compressed-gas circuit interrupter with a heater
HITACHI LTD22 citations81
US5159164AOct 27, 1992
Gas circuit breaker
HITACHI LTD8 citations73
US5153397AOct 6, 1992
Gas circuit breaker
HITACHI LTD8 citations73
US5079391AJan 7, 1992
Puffer type gas circuit breaker, contact cover and insulated nozzle of the breaker
HITACHI LTD8 citations73
US5072084ADec 10, 1991
Gas circuit breaker
HITACHI LTD16 citations73
US4182942AJan 8, 1980
Puffer-type gas-blast circuit breaker
HITACHI LTD19 citations73
US5039831AAug 13, 1991
Circuit breaker
HITACHI LTD16 citations72
US5012051AApr 30, 1991
Three-phase common container-type circuit breaker
HITACHI LTD8 citations72
US6621030B2Sep 16, 2003
Gas-insulated switchgear
HITACHI LTD10 citations71
US5814781ASep 29, 1998
Puffer type gas circuit breaker
HITACHI LTD15 citations71
US5610381AMar 11, 1997
Compression gas puffer type circuit breaker
HITACHI LTD8 citations71
US5391930AFeb 21, 1995
Circuit breaker with parallel resistor
HITACHI LTD8 citations71
US5079392AJan 7, 1992
Gas circuit breaker
HITACHI LTD17 citations70
US5821496AOct 13, 1998
Method of controlling transient recovery voltage and gas insulation switch gear using the same
HITACHI LTD7 citations69
US5502290AMar 26, 1996
Switch mechanism
HITACHI LTD5 citations63
US5151566ASep 29, 1992
Gas circuit breaker
HITACHI LTD5 citations62
US4211903AJul 8, 1980
Electromagnetic puffer type gas circuit breaker
HITACHI LTD3 citations62