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:
Aug. 24, 1982
Filed:
Sep. 18, 1980
Applicant:
Inventors:
Emerson D Spengler, Lebanon, PA (US);
Charles W Schaeffer, Lebanon, PA (US);
Assignee:
Bethlehem Steel Corporation, Bethlehem, PA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B21K / ;
U.S. Cl.
CPC ...
7610 / ;
Abstract
An inexpensive method to make a punch for piercing or forming metal includes cutting a piece from a bar or rod, applying a phosphate and lubricant coating to the piece, extruding one end of the piece into a polygonal shape, annealing the piece, press or machine relieving the piece, machining the end of the piece having the polygonal shape and heat treating the piece to the proper hardness.