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Katsuyuki NISHIOKA
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Yokohama-shi, JP
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Patents Grants
last 30 patents
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Patent Grant
Method for heat treatment of coiled spring
Patent number
8,460,483
Issue date
Jun 11, 2013
NHK Spring Co., Ltd.
Takashi Yajima
C21 - METALLURGY OF IRON
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Patent Grant
High strength spring
Patent number
5,258,082
Issue date
Nov 2, 1993
NHK Spring Co., Ltd.
Hiroshi Koyama
C21 - METALLURGY OF IRON
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Patent Grant
Method for manufacturing a high-strength spring
Patent number
5,225,008
Issue date
Jul 6, 1993
NHK Spring Co., Ltd.
Hiroshi Koyama
C21 - METALLURGY OF IRON
Patents Applications
last 30 patents
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Patent Application
METHOD FOR HEAT TREATMENT OF COILED SPRING
Publication number
20110232810
Publication date
Sep 29, 2011
NHK Spring Co., Ltd.
Takashi YAJIMA
C21 - METALLURGY OF IRON