Hiromichi Okabe

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Hirakata, JP

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Patents Grantslast 30 patents

Information Patent Grant
Process for preparing and purifying p-phenylenediamine
- Patent number 4,191,708
- Issue date Mar 4, 1980
- Sumitomo Chemical Company, Limited
- Hiromichi Okabe
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Process for producing 8-amino-1-naphthol-3,6-disulfonic acid
- Patent number 4,111,979
- Issue date Sep 5, 1978
- Sumitomo Chemical Company, Limited
- Norio Kotera
- C07 - ORGANIC CHEMISTRY