Masao Kawashima

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Funabashi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of rolling a screw with groove for self-locking
- Patent number 4,782,681
- Issue date Nov 8, 1988
- JSM Screw Co., Ltd.
- Masao Kawashima
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Rolling flat die for manufacturing a screw with groove for self-loc...
- Patent number 4,782,688
- Issue date Nov 8, 1988
- JSM Screw Co., Ltd.
- Masao Kawashima
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
Information Patent Grant
Screw with groove for self-lock and method and rolling flat die for...
- Patent number 4,764,067
- Issue date Aug 16, 1988
- JSM Screw Co., Ltd.
- Masao Kawashima
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...