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Tazuo Ohta
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Tokyo, JP
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last 30 patents
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Patent Grant
Process for producing highly pure isophthalic acid
Patent number
5,189,209
Issue date
Feb 23, 1993
Mitsubishi Gas Chemical Company, Inc.
Tazuo Ohta
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for producing high purity isophthalic acid
Patent number
5,132,450
Issue date
Jul 21, 1992
Mitsubishi Gas Chemical Company, Inc.
Kazuo Tanaka
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process and apparatus for producing terephthalic acid with high purity
Patent number
4,297,507
Issue date
Oct 27, 1981
Mitsubishi Gas Chemical Co. Inc.
Makoto Komatsu
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for producing terephthalic acid of high purity
Patent number
4,268,690
Issue date
May 19, 1981
Mitsubishi Gas Chemical Company, Inc.
Makoto Komatsu
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for preventing blackening of phthalic acid
Patent number
4,214,100
Issue date
Jul 22, 1980
Mitsubishi Gas Chemical Company, Inc.
Makoto Komatsu
C07 - ORGANIC CHEMISTRY
Information
Patent Grant
Process for producing terephthalic acid
Patent number
4,211,882
Issue date
Jul 8, 1980
Mitsubishi Gas Chemical Company, Inc.
Makoto Komatsu
C07 - ORGANIC CHEMISTRY