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:
Oct. 31, 1989
Filed:
Jul. 07, 1988
Applicant:
Inventor:
Heiji Sugita, Tokyo, JP;
Assignee:
Sugita Wire Mfg. Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C22C / ;
U.S. Cl.
CPC ...
148 / ; 148 / ;
Abstract
There is provided an oil tempered and hard drawn steel wire for springs which comprises having a phosphate coating on the surface thereof if necessary, high strength, and a shaped cross section free of twist in the longitudinal direction. It is produced by oil tempering, descaling, and phosphate treatment if necessary, and cold working. Having a shaped cross section free of twist in the longitudinal direction, the steel wire can be formed into high quality springs in which the individual cross sections of the wire are arranged regularly in the same direction. The steel wire is particularly suitable for making springs.