Inventor · disambiguated record
Yoshio Koyama
Also filed as: KOYAMA YOSHIO
10 granted patents·152 citations·filing 1977–2016
90Inventor score
Top patents by PatentIndex Score
10 records- 0194US9556761B2Valve seatTPR CO LTD·Filed 2013·Granted Jan 31, 2017·30 cites·5 claims
- 0291US6951579B2Sintered alloy for valve seats, valve seat and manufacturing method thereofTEIKOKU PISTON RING CO LTD·Filed 2003·Granted Oct 4, 2005·44 cites·8 claims
- 0380US9581056B2Valve seatKOYAMA YOSHIO·Filed 2012·Granted Feb 28, 2017·6 cites·4 claims
- 0477US10036287B2Valve seatTPR CO LTD·Filed 2016·Granted Jul 31, 2018·1 cites·6 claims
- 0563US4879412APurification process of methacrylic acidMITSUI TOATSU CHEMICALS·Filed 1986·Granted Nov 7, 1989·8 cites·4 claims
- 0658US4801090ADischarge pipe and discharge apparatus using the sameHOCHIKI CO·Filed 1986·Granted Jan 31, 1989·26 cites·14 claims
- 0756USD291873SBicycleKOYAMA YOSHIO·Filed 1985·Granted Sep 15, 1987·8 cites·1 claims
- 0851US4968846AMethod for the prevention of post oxidation of methacroleinMITSUI TOATSU CHEMICALS·Filed 1988·Granted Nov 6, 1990·13 cites·9 claims
- 0944US4119152ALong-distance spraying device for fire hoseKOYAMA YOSHIO·Filed 1977·Granted Oct 10, 1978·10 cites·1 claims
- 1042US4491817ASheet-wound transformerTOKYO SHIBAURA ELECTRIC CO·Filed 1984·Granted Jan 1, 1985·6 cites·3 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →