Inventor
Osamu Koyanagi
Inventor
Hitachi, JP
Overview
Patents· 19 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
H01Hprimary
H01HElectric switches90%
H02BBoards, substations or switching arrangements for the supply or distribution of electric power10%
PatentTitleYear
6,621,030'Gas-insulated switchgear'20035,821,496'Method of controlling transient recovery voltage and gas insulation switch gear using the same'19985,814,781'Puffer type gas circuit breaker'19985,793,597'Puffer type gas breaker'19985,610,381'Compression gas puffer type circuit breaker'19975,502,290'Switch mechanism'19965,391,930'Circuit breaker with parallel resistor'19955,159,164'Gas circuit breaker'19925,153,397'Gas circuit breaker'19925,151,566'Gas circuit breaker'19925,079,392'Gas circuit breaker'19925,079,391'Puffer type gas circuit breaker, contact cover and insulated nozzle of the breaker'19925,072,084'Gas circuit breaker'19915,039,831'Circuit breaker'19915,012,051'Three-phase common container-type circuit breaker'19914,939,322'Puffer type circuit breaker'19904,434,335'Compressed-gas circuit interrupter with a heater'19844,211,903'Electromagnetic puffer type gas circuit breaker'19804,182,942'Puffer-type gas-blast circuit breaker'1980Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1980–2003Patents assigned to HITACHI LTD (19)· patent assignee history
1980–2003Based in Hitachi, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 19 | 1980–2003 |
Locations
| Location | Patents | Span |
|---|---|---|
| Hitachi, JP | 19 | 1980–2003 |