Inventor · disambiguated record
Shigefumi Tokumasu
Also filed as: TOKUMASU SHIGEFUMI
5 granted patents·14 citations·filing 1991–2003
70Inventor score
Technology areasC07C
Top patents by PatentIndex Score
5 records- 0162US5959155AProcess for the extraction of hydroperoxidesSUMITOMO CHEMICAL CO·Filed 1997·Granted Sep 28, 1999·11 cites·8 claims
- 0249US6423876B1Process for producing dihydroxybenzeneSUMITOMO CHEMICAL CO·Filed 2002·Granted Jul 23, 2002·1 cites·5 claims
- 0334US5962747AProcess for producing 1,3-di-(2-hydroperoxy-2-propyl) benzeneSUMITOMO CHEMICAL CO·Filed 1997·Granted Oct 5, 1999·2 cites·5 claims
- 0429US5138109AProcess for preparing halogenated alkylSUMITOMO CHEMICAL CO·Filed 1991·Granted Aug 11, 1992·0 cites·21 claims
- 0524US6960698B2Method for treating tarSUMITOMO CHEMICAL COMPNAY LIMT·Filed 2003·Granted Nov 1, 2005·0 cites·9 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →