Yasuhiro Hirai

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Tsukuba, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for producing isotropic pitch, activated carbon fibers and c...
- Patent number 6,228,343
- Issue date May 8, 2001
- Mitsubishi Gas Chemical Company, Inc.
- Takahumi Yoshimura
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
Information Patent Grant
Method for producing isotropic pitch, activated carbon fibers and c...
- Patent number 5,944,980
- Issue date Aug 31, 1999
- Mitsubishi Gas Chemical Company Co., Inc.
- Takahumi Yoshimura
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
Information Patent Grant
Pitch with reduced tendency to smoke during spinning and a process...
- Patent number 5,644,018
- Issue date Jul 1, 1997
- Mitsubishi Gas Chemical Company, Inc.
- Takashi Kojima
- D01 - NATURAL OR ARTIFICIAL THREADS OR FIBRES SPINNING
Information Patent Grant
Heat-resistant resin composition
- Patent number 5,321,097
- Issue date Jun 14, 1994
- Mitsubishi Gas Chemical Company, Inc.
- Takao Kawaki
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...