Inventor · disambiguated record
Masaaki Ohkawa
Also filed as: OHKAWA MASAAKI
4 granted patents·36 citations·filing 1971–1974
74Inventor score
Files withSUMITOMO CHEMICAL CO4
Top patents by PatentIndex Score
4 records- 0183US3933847AMethod relating to manufacture of coumarin derivativesSUMITOMO CHEMICAL CO·Filed 1973·Granted Jan 20, 1976·13 cites·10 claims
- 0272US3966594ATreatment of aqueous waste solutionSUMITOMO CHEMICAL CO·Filed 1974·Granted Jun 29, 1976·16 cites·16 claims
- 0348US3974178ANaphthostyril cationic dyesSUMITOMO CHEMICAL CO·Filed 1973·Granted Aug 10, 1976·3 cites·5 claims
- 0438US4018756AThiazole and benzothiazole cationic dyesSUMITOMO CHEMICAL CO·Filed 1971·Granted Apr 19, 1977·4 cites·13 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →