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:
Nov. 27, 1990
Filed:
Jul. 20, 1989
Applicant:
Inventor:
Thore Lund, Hofors, SE;
Assignee:
Ovako Steel AB, , SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C21D / ; C21D / ;
U.S. Cl.
CPC ...
148 124 ; 148 / ; 148 / ; 148 / ; 148906 ;
Abstract
Steel elements designed to withstand high stress, such as roller bearing elements, are produced by using a steel which has substantially eutectoid composition, a such a steel billet being plasticly formed, without prior soft-annealing, at a temperature just above the A1 temperature of the steel, to a shape approaching the final shape of the element, the element thus shaped being thereafter hardened directly from the forming temperature and being subsequently subjected in conventional manner to final grinding and polishing if required.