Yoshiyuki Hayakawa

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Sapporo-shi, Hokkaido, JP

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Patents Grantslast 30 patents

Information Patent Grant
Concrete form member
- Patent number 6,296,224
- Issue date Oct 2, 2001
- Yoshiyuki Hayakawa
- E04 - BUILDING
Information Patent Grant
Concrete form spacing fixture
- Patent number 5,761,874
- Issue date Jun 9, 1998
- Yoshiyuki Hayakawa
- E04 - BUILDING
Information Patent Grant
Concrete molding form member
- Patent number 5,632,923
- Issue date May 27, 1997
- Yoshiyuki Hayakawa
- E04 - BUILDING