Yoshiki Hiyama

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Naka-shi, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of forming spring washer blind-holes into a piston for an au...
- Patent number 7,823,432
- Issue date Nov 2, 2010
- Ibaraki Steel Center Co., Ltd.
- Masakazu Ooka
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...

Patents Applicationslast 30 patents

Information Patent Application
Method of forming spring washer blind-holes into a piston for an au...
- Publication number 20090282885
- Publication date Nov 19, 2009
- Masakazu Ooka
- B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...