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Chiba, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Poly(arylene sulfide) resin composition
Patent number
5,227,429
Issue date
Jul 13, 1993
Tohpren Co., Ltd.
Takashi Kawamura
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Process for preparation of polyphenylene-sulfide resins in the abse...
Patent number
5,071,949
Issue date
Dec 10, 1991
Tohpren Co., Ltd.
Yoshiaki Nakamura
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Method for removing impurities from polyphenylene sulfide resin
Patent number
4,841,022
Issue date
Jun 20, 1989
Tohpren, Co., Ltd.
Yoshiaki Nakamura
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information
Patent Grant
Process for purification of polyphenylene-sulfide
Patent number
4,728,723
Issue date
Mar 1, 1988
Tohpren Co., Ltd.
Yoshiaki Nakamura
C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...