Akira Yokoyama

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Okayama, JP

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Patents Grantslast 30 patents

Information Patent Grant
Method of gas carburizing and hardening
- Patent number 4,836,864
- Issue date Jun 6, 1989
- Chugai Ro Co., Ltd.
- Koji Murakami
- C21 - METALLURGY OF IRON
Information Patent Grant
Continuous furnace for gas carburizing and hardening
- Patent number 4,807,853
- Issue date Feb 28, 1989
- Chugai Ro Co., Ltd.
- Koji Murakami
- C21 - METALLURGY OF IRON