Inventor · disambiguated record
Keizo Hirayama
Also filed as: HIRAYAMA KEIZO
3 granted patents·40 citations·filing 1981–1999
71Inventor score
Top patents by PatentIndex Score
3 records- 0167US5982015AHigh breakdown voltage semiconductor deviceTOSHIBA KK·Filed 1999·Granted Nov 9, 1999·24 cites·18 claims
- 0250US4433229AElectrode roll for resistance weldingDAIWA CAN CO LTD·Filed 1981·Granted Feb 21, 1984·12 cites·3 claims
- 0336US6133617AHigh breakdown voltage semiconductor deviceTOSHIBA KK·Filed 1999·Granted Oct 17, 2000·4 cites·19 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →