Yoshio Koyama

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Osaka, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method for the prevention of post oxidation of methacrolein
- Patent number 4,968,846
- Issue date Nov 6, 1990
- Mitsui Toatsu Chemicals, Incorporated
- Morimasa Kuragano
- C07 - ORGANIC CHEMISTRY
Information Patent Grant
Purification process of methacrylic acid
- Patent number 4,879,412
- Issue date Nov 7, 1989
- Mitsui Toatsu Chemicals, Inc.
- Kozo Iwasaki
- C07 - ORGANIC CHEMISTRY