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:
Jun. 11, 2013
Filed:
Mar. 21, 2011
Applicants:
Takashi Yajima, Yokohama, JP;
Hideki Okada, Yokohama, JP;
Katsuyuki Nishioka, Yokohama, JP;
Takeshi Furuse, Yokohama, JP;
Inventors:
Takashi Yajima, Yokohama, JP;
Hideki Okada, Yokohama, JP;
Katsuyuki Nishioka, Yokohama, JP;
Takeshi Furuse, Yokohama, JP;
Assignee:
NHK Spring Co., Ltd., Yokohama-Shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/02 (2006.01); C21D 8/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for heat treatment of a coiled spring includes cold forming a coiled spring, annealing the coiled spring after the cold forming, thereby removing of residual stress generated in the cold forming, in which the annealing is performed by electric resistance heating.