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. 20, 1977
Filed:
Jan. 22, 1976
Applicant:
Inventors:
Hans Rudolf Siegwart, Kilchberg, CH;
Dietmar Leeb, Zurich, CH;
Assignee:
Bureau BBR Ltd., Zurich, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B21C / ; B21F / ;
U.S. Cl.
CPC ...
428602 ; 85 28 ;
Abstract
An upset head and a method of producing the same at a high-strength tension wire, wherein there is formed a supporting seating surface at the transition between the head and the wire. The maximum head diameter is located in the third of the height of the head situated closest to the seating surface. The head diameter at the free head end is equal to or smaller than the wire diameter and the head possesses the shape of a truncated cone at its end section.