The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 21, 2019
Filed:
Feb. 19, 2014
Applicant:
Honda Motor Co., Ltd., Tokyo, JP;
Inventor:
Hirokuni Fuchigami, Saitama, JP;
Assignee:
HONDA MOTOR CO., LTD., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D 9/02 (2006.01); C21D 1/10 (2006.01); C21D 1/18 (2006.01); C22C 38/00 (2006.01); C22C 38/58 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/32 (2006.01); C22C 38/52 (2006.01); C21D 6/00 (2006.01); C22C 38/40 (2006.01); C21D 9/52 (2006.01); C21D 1/25 (2006.01);
U.S. Cl.
CPC ...
C21D 9/02 (2013.01); C21D 1/10 (2013.01); C21D 1/18 (2013.01); C21D 1/25 (2013.01); C21D 6/004 (2013.01); C21D 9/525 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/32 (2013.01); C22C 38/40 (2013.01); C22C 38/52 (2013.01); C22C 38/58 (2013.01); C21D 2251/02 (2013.01);
Abstract
A steel wire for a spring, in which the sag resistance and the fatigue characteristics are improved by production processes without addition of alloy elements, is provided. The spring has a structure obtained by quenching and tempering and includes a first layer at a surface thereof, a second layer interior to the first layer, and a third layer, which is interior to the second layer and reaches a center of the spring, and the second layer has lower hardness than the first and the third layers.