Takao Yanagisawa

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Izumi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Organic fluorescent whitening pigment composition having an excelle...
- Patent number 6,488,867
- Issue date Dec 3, 2002
- Hakkol Chemical Co., Ltd.
- Shigekazu Matsumoto
- D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
Information Patent Grant
Near-infrared ray absorbing polyazo compound
- Patent number 6,140,477
- Issue date Oct 31, 2000
- Hakkol Chemical Co., Ltd.
- Shigekazu Matsumoto
- C09 - DYES PAINTS POLISHES NATURAL RESINS ADHESIVES MISCELLANEOUS COMPOSITION...
Information Patent Grant
Organic white pigment
- Patent number 5,606,055
- Issue date Feb 25, 1997
- Hakkol Chemical Co., Ltd.
- Shigekazu Matsumoto
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Organic white pigment
- Patent number 5,514,213
- Issue date May 7, 1996
- Hakkol Chemical Co., Ltd.
- Shigekazu Matsumoto
- C07 - ORGANIC CHEMISTRY