Hiroshi Oka

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Kawasaki, JP

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Patents Grantslast 30 patents

Information Patent Grant
Dewatering agent for sludge
- Patent number 5,525,692
- Issue date Jun 11, 1996
- Kohjin Co., Ltd.
- Akiyoshi Nagamoto
- C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
Information Patent Grant
N,N-dialkylaminoalkyl (meth) acrylamide composition with improved s...
- Patent number 5,292,950
- Issue date Mar 8, 1994
- Kohjin Co., Ltd.
- Hiroshi Oka
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Method for separation of solid mixtures by simultaneous multi-stage...
- Patent number 4,544,391
- Issue date Oct 1, 1985
- Kohjin Co., Ltd.
- Hiroshi Oka
- B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL