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. 02, 1994
Filed:
Apr. 16, 1993
Charles J Bruggemann, Rochester Hills, MI (US);
Michael G Poss, St. Clair Shores, MI (US);
Sanjay M Shah, Rochester Hills, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
This invention teaches a method for producing a tubular structural member which can longitudinally vary in wall thickness, perimeter and material using the hydroforming process. This is accomplished by first fabricating a tube blank of the desired longitudinal combination of wall thickness, perimeter and material by welding together portions of tubing having the desired characteristics and then hydroforming the resultant blank. The hydroformed part will have nearly the same thickness, perimeter and material characteristics as the blank in the corresponding longitudinal location.