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:
Feb. 26, 1991
Filed:
Feb. 02, 1990
Applicant:
Inventors:
Kurt Alznauer, Lauchringen, DE;
Michael Baumgartner, Rekingen, CH;
Werner Boegli, Bergdietikon, CH;
Jurgen Brauer, Boniswil, CH;
Assignee:
Elpatronic AG, Zug, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
723421 ; 72393 ;
Abstract
A method and an apparatus for ensuring the dimensional accuracy of a frusto-pyramidal can body (10). During the production of the body (10) this is partially heated by means of inductors in the vicinity of its base face in the region of its broader side faces (10a,10b), before the step in which it is formed into the pyramidal frustum. In this manner, a uniform reduction in the thickness of the sheet metal is achieved in the region of the base face of the pyramidal frustum during the widening operation.