Osamu Koyanagi

Person

Hitachi, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Gas-insulated switchgear
- Patent number 6,621,030
- Issue date Sep 16, 2003
- Hitachi, Ltd.
- Tomoyuki Andou
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Method of controlling transient recovery voltage and gas insulation...
- Patent number 5,821,496
- Issue date Oct 13, 1998
- Hitachi, Ltd.
- Eisaku Mizufune
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer type gas circuit breaker
- Patent number 5,814,781
- Issue date Sep 29, 1998
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer type gas breaker
- Patent number 5,793,597
- Issue date Aug 11, 1998
- Hitachi, Ltd.
- Eisaku Mizufune
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Compression gas puffer type circuit breaker
- Patent number 5,610,381
- Issue date Mar 11, 1997
- Hitachi, Ltd.
- Eisaku Mizufune
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Switch mechanism
- Patent number 5,502,290
- Issue date Mar 26, 1996
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Circuit breaker with parallel resistor
- Patent number 5,391,930
- Issue date Feb 21, 1995
- Hitachi, Ltd.
- Youichi Ohshita
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas circuit breaker
- Patent number 5,159,164
- Issue date Oct 27, 1992
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas circuit breaker
- Patent number 5,153,397
- Issue date Oct 6, 1992
- Hitachi, Ltd.
- Yasuharu Seki
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas circuit breaker
- Patent number 5,151,566
- Issue date Sep 29, 1992
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer type gas circuit breaker, contact cover and insulated nozzle...
- Patent number 5,079,391
- Issue date Jan 7, 1992
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas circuit breaker
- Patent number 5,079,392
- Issue date Jan 7, 1992
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Gas circuit breaker
- Patent number 5,072,084
- Issue date Dec 10, 1991
- Hitachi, Ltd.
- Yasuharu Seki
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Circuit breaker
- Patent number 5,039,831
- Issue date Aug 13, 1991
- Hitachi, Ltd.
- Minori Sato
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Three-phase common container-type circuit breaker
- Patent number 5,012,051
- Issue date Apr 30, 1991
- Hitachi, Ltd.
- Masanori Tsukushi
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Puffer type circuit breaker
- Patent number 4,939,322
- Issue date Jul 3, 1990
- Hitachi, Ltd.
- Katsuichi Kashimura
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Compressed-gas circuit interrupter with a heater
- Patent number 4,434,335
- Issue date Feb 28, 1984
- Hitachi, Ltd.
- Ken-ichi Natsui
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Electromagnetic puffer type gas circuit breaker
- Patent number 4,211,903
- Issue date Jul 8, 1980
- Hitachi, Ltd.
- Masanori Tsukushi
- H01 - BASIC ELECTRIC ELEMENTS
Information Patent Grant
Puffer-type gas-blast circuit breaker
- Patent number 4,182,942
- Issue date Jan 8, 1980
- Hitachi, Ltd.
- Osamu Koyanagi
- H01 - BASIC ELECTRIC ELEMENTS

Patents Applicationslast 30 patents

Information Patent Application
Gas-insulated switchgear
- Publication number 20030094436
- Publication date May 22, 2003
- Tomoyuki Andou
- H01 - BASIC ELECTRIC ELEMENTS

Osamu Koyanagi

Person

Patents Grantslast 30 patents

Gas-insulated switchgear

Method of controlling transient recovery voltage and gas insulation...

Puffer type gas circuit breaker

Puffer type gas breaker

Compression gas puffer type circuit breaker

Switch mechanism

Circuit breaker with parallel resistor

Gas circuit breaker

Gas circuit breaker

Gas circuit breaker

Puffer type gas circuit breaker, contact cover and insulated nozzle...

Gas circuit breaker

Gas circuit breaker

Circuit breaker

Three-phase common container-type circuit breaker

Puffer type circuit breaker

Compressed-gas circuit interrupter with a heater

Electromagnetic puffer type gas circuit breaker

Puffer-type gas-blast circuit breaker

Patents Applicationslast 30 patents

Gas-insulated switchgear