Yasumasa Hirai

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Chiyoda-ku, JP

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Patents Grantslast 30 patents

Information Patent Grant
Bearing steel being excellent both in workability after spheroidizi...
- Patent number 9,034,120
- Issue date May 19, 2015
- JFE Steel Corporation
- Yasumasa Hirai
- C21 - METALLURGY OF IRON
Information Patent Grant
Bearing steel being excellent both in post spheroidizing-annealing...
- Patent number 8,894,779
- Issue date Nov 25, 2014
- JFE Steel Corporation
- Yasumasa Hirai
- C21 - METALLURGY OF IRON

Patents Applicationslast 30 patents

Information Patent Application
BEARING STEEL BEING EXCELLENT BOTH IN WORKABILITY AFTER SPHEROIDIZI...
- Publication number 20130224065
- Publication date Aug 29, 2013
- JFE STEEL CORPORATION
- Yasumasa Hirai
- C21 - METALLURGY OF IRON
Information Patent Application
BEARING STEEL BEING EXCELLENT BOTH IN POST SPHEROIDIZING-ANNEALING...
- Publication number 20130189147
- Publication date Jul 25, 2013
- JFE STEEL CORPORATION
- Yasumasa Hirai
- C21 - METALLURGY OF IRON