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:
Jan. 07, 2020
Filed:
Oct. 26, 2015
Applicants:
Kobe Steel, Ltd., Kobe-shi, JP;
Nhk Spring Co., Ltd., Yokohama-shi, JP;
Inventors:
Takuya Kochi, Kobe, JP;
Hitoshi Hatano, Kobe, JP;
Akira Tange, Yokohama, JP;
Kiyoshi Kurimoto, Yokohama, JP;
Yurika Goto, Yokohama, JP;
Assignees:
Kobe Steel, Ltd., Kobe-shi, JP;
NHK SPRING CO., LTD., Yokohama-shi, JP;
Primary Examiner:
Int. Cl.
CPC ...
C21D 9/08 (2006.01); C22C 38/06 (2006.01); C22C 38/02 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/18 (2006.01); C22C 38/04 (2006.01); C21D 9/02 (2006.01); C22C 38/50 (2006.01); C22C 38/20 (2006.01); C22C 38/46 (2006.01); C22C 38/42 (2006.01); C22C 38/48 (2006.01); C22C 38/40 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 9/02 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01);
Abstract
A method for manufacturing steel, by quenching and tempering a seamless pipe for use as a material of a hollow spring, where the seamless pipe including predetermined components is subjected to a heat treatment which is performed to satisfy quenching conditions (1) and tempering conditions (2),