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:
Sep. 09, 1997
Filed:
May. 30, 1996
Applicant:
Inventor:
Helmut Swars, Bergisch Gladbach, DE;
Assignee:
Emitec Gesellschaft fur Emissionstechnologie GmbH, Lohmar, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23P / ;
U.S. Cl.
CPC ...
2988808 ; 294211 ; 29446 ; 29523 ; 2988809 ; 298881 ;
Abstract
A process for producing hollow composite members, comprising the steps of: providing an outer material layer; providing a tubular supporting member within the outer layer; initially plastically expanding the supporting member to produce a connection between the outer layer and the supporting member; and subsequently plastically expanding the supporting member in a central region while simultaneously axially shortening the supporting member, so that a tensile prestress is generated in the circumferential direction and a compressive prestress is generated in the longitudinal direction of the outer layer.