Yoji Hirai

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Omiya, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method and apparatus for producing active carbon using carbon-conta...
- Patent number 5,287,383
- Issue date Feb 15, 1994
- Heiyo Shoji Kabushiki Kaisha
- Yoji Hirai
- C01 - INORGANIC CHEMISTRY
Information Patent Grant
Method for producing active carbon using carbon-containing material
- Patent number 5,190,901
- Issue date Mar 2, 1993
- Heiyo Shoji Kabushiki Kaisha
- Yoji Hirai
- C01 - INORGANIC CHEMISTRY