Inventor · disambiguated record
Kohei Ishizuka
Also filed as: ISHIZUKA KOHEI · TAKASAKI YOSHITAKA
11 granted patents·243 citations·filing 1975–1993
91Inventor score
Files withHITACHI LTD11
Top patents by PatentIndex Score
11 records- 0187US4187479AVariable equalizerHITACHI LTD·Filed 1977·Granted Feb 5, 1980·55 cites·6 claims
- 0280US4292596AGain control circuitHITACHI LTD·Filed 1979·Granted Sep 29, 1981·21 cites·9 claims
- 0374US5479288ALight transmission moduleHITACHI LTD·Filed 1993·Granted Dec 26, 1995·73 cites·10 claims
- 0471US4004253AVariable equalizerHITACHI LTD·Filed 1975·Granted Jan 18, 1977·23 cites·25 claims
- 0567US4531089AElectric power detecting circuit and gain control circuit using the sameHITACHI LTD·Filed 1982·Granted Jul 23, 1985·16 cites·7 claims
- 0666US4477913AAutomatic equalizer apparatusHITACHI LTD·Filed 1982·Granted Oct 16, 1984·24 cites·7 claims
- 0754US4122417AVariable equalizerHITACHI LTD·Filed 1977·Granted Oct 24, 1978·12 cites·6 claims
- 0848US4080580AVariable equalizerHITACHI LTD·Filed 1976·Granted Mar 21, 1978·9 cites·6 claims
- 0943US4204176AVariable equalizerHITACHI LTD·Filed 1978·Granted May 20, 1980·7 cites·5 claims
- 1031US4097824AVariable equalizerHITACHI LTD·Filed 1977·Granted Jun 27, 1978·2 cites·4 claims
- 1128US4101851AVariable equalizerHITACHI LTD·Filed 1976·Granted Jul 18, 1978·1 cites·2 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →