Toshio Tsubota

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Shiga, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for production of polyphenylene sulfone fibers
- Patent number 5,244,467
- Issue date Sep 14, 1993
- Toray Industries, Inc.
- Masao Umezawa
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
Information Patent Grant
Polyphenylene sulfone fibers and a method for production thereof
- Patent number 4,942,091
- Issue date Jul 17, 1990
- Toray Industries, Inc.
- Masao Umezawa
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING