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. 09, 1999
Filed:
Sep. 09, 1997
Applicant:
Inventors:
Frank Wehner, Steisslingen, DE;
Gerd Springe, Wangen, DE;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D / ;
U.S. Cl.
CPC ...
72 60 ; 72 62 ; 72 56 ;
Abstract
Hollow bodies such as construction elements for vehicle manufacture can be produced by forming a preform in the form of a longitudinal body or sheets of aluminum or its alloys by means of a high internal pressure process or by superplastic forming in a tool. In this process the preform is heat treated locally before forming, on places of high elongation during the forming process and/or the tool for the forming process is equipped with local surface characteristics of different friction such as roughness patterns or with smoothed surfaces.