Inventor · disambiguated record
Osamu Koyanagi
Also filed as: KOYANAGI OSAMU
19 granted patents·233 citations·filing 1977–2002
95Inventor score
Files withHITACHI LTD19
Top patents by PatentIndex Score
19 records- 0179US4434335ACompressed-gas circuit interrupter with a heaterHITACHI LTD·Filed 1981·Granted Feb 28, 1984·22 cites·9 claims
- 0277US4182942APuffer-type gas-blast circuit breakerHITACHI LTD·Filed 1977·Granted Jan 8, 1980·19 cites·28 claims
- 0376US4939322APuffer type circuit breakerHITACHI LTD·Filed 1989·Granted Jul 3, 1990·24 cites·8 claims
- 0471US5793597APuffer type gas breakerHITACHI LTD·Filed 1996·Granted Aug 11, 1998·26 cites·9 claims
- 0561US5072084AGas circuit breakerHITACHI LTD·Filed 1990·Granted Dec 10, 1991·16 cites·7 claims
- 0659US6621030B2Gas-insulated switchgearHITACHI LTD·Filed 2002·Granted Sep 16, 2003·10 cites·6 claims
- 0759US5079392AGas circuit breakerHITACHI LTD·Filed 1990·Granted Jan 7, 1992·17 cites·10 claims
- 0856US5814781APuffer type gas circuit breakerHITACHI LTD·Filed 1996·Granted Sep 29, 1998·15 cites·4 claims
- 0955US5039831ACircuit breakerHITACHI LTD·Filed 1989·Granted Aug 13, 1991·16 cites·6 claims
- 1045US5159164AGas circuit breakerHITACHI LTD·Filed 1991·Granted Oct 27, 1992·8 cites·8 claims
- 1145US5153397AGas circuit breakerHITACHI LTD·Filed 1991·Granted Oct 6, 1992·8 cites·6 claims
- 1245US5079391APuffer type gas circuit breaker, contact cover and insulated nozzle of the breakerHITACHI LTD·Filed 1990·Granted Jan 7, 1992·8 cites·12 claims
- 1344US5012051AThree-phase common container-type circuit breakerHITACHI LTD·Filed 1989·Granted Apr 30, 1991·8 cites·5 claims
- 1442US5391930ACircuit breaker with parallel resistorHITACHI LTD·Filed 1992·Granted Feb 21, 1995·8 cites·8 claims
- 1541US5610381ACompression gas puffer type circuit breakerHITACHI LTD·Filed 1995·Granted Mar 11, 1997·8 cites·9 claims
- 1639US4211903AElectromagnetic puffer type gas circuit breakerHITACHI LTD·Filed 1977·Granted Jul 8, 1980·3 cites·7 claims
- 1738US5821496AMethod of controlling transient recovery voltage and gas insulation switch gear using the sameHITACHI LTD·Filed 1995·Granted Oct 13, 1998·7 cites·18 claims
- 1838US5151566AGas circuit breakerHITACHI LTD·Filed 1990·Granted Sep 29, 1992·5 cites·4 claims
- 1937US5502290ASwitch mechanismHITACHI LTD·Filed 1995·Granted Mar 26, 1996·5 cites·12 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →