Yuji Ishihara

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Maebashi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Water-swellable caulking material for water-leakage prevention
- Patent number 4,756,952
- Issue date Jul 12, 1988
- C. I. Kasei Co., Ltd.
- Hiroharu Sasayama
- E04 - BUILDING
Information Patent Grant
Waterstop
- Patent number 4,740,404
- Issue date Apr 26, 1988
- C. I. Kasei, Co. Ltd.
- Shozo Otsugu
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES