Inventor · disambiguated record
Masafumi Yoshikawa
Also filed as: YOSHIKAWA MASAFUMI
3 granted patents·11 citations·filing 1997–2009
62Inventor score
Top patents by PatentIndex Score
3 records- 0157US8303206B2Ink composition for writing tool and writing toolYOSHIKAWA MASAFUMI·Filed 2009·Granted Nov 6, 2012·1 cites·7 claims
- 0257US7600937B2Aqueous gel ballpoint pen and method for the production thereofZEBRA CO LTD·Filed 2008·Granted Oct 13, 2009·3 cites·4 claims
- 0331US5866669ASulfonated phenol-formaldehyde resin for paper-makingMEISEI CHEMICAL WORKS LTD·Filed 1997·Granted Feb 2, 1999·7 cites·2 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →