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, 1985
Filed:
Mar. 29, 1984
Applicant:
Inventor:
John J Prusak, Indianapolis, IN (US);
Assignee:
RCA Corporation, Princeton, NJ (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C22F / ; C22F / ;
U.S. Cl.
CPC ...
148 / ; 148 / ; 148 / ; 266249 ; 369283 ; 425810 ;
Abstract
An improved method and apparatus is provided for the manufacture of stampers in which the stampers are electroformed from a relatively hard metal in a flat configuration and then, either before or after shaping of the shaped inner and outer edges, but prior to the use in the pressing of records, the inner and/or outer edges are selectively annealed to increase the ductility of these portions while retaining hardness of the remainder of the stamper.