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:
Dec. 03, 1991
Filed:
Jul. 10, 1990
Applicant:
Inventor:
John S Bruce, Tilton on the Hill, GB;
Assignee:
T&N plc, , GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
29888073 ; 2988807 ; 277216 ; 277217 ;
Abstract
In the manufacture of a piston ring an intermediate ring is produced by bending a metal strip first to a smaller radius of curvature than required and then bending the metal strip again to increase its radius of curvature. The first and further bends are chosen to produce an intermediate ring, whereby the intermediate ring does not change shape when subjected to stress-relaxation temperatures, and has the required shape for the piston ring.