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. 29, 1995
Filed:
Aug. 10, 1994
Gary L Snavely, Milford, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A novel method of cutting a complexly shaped end edge of a tube is incorporated into the apparatus for forming the tube to shape. Hydroforming dies are provided with a pair of sharp ribs which, simultaneously with the pressurized expansion of the tube out into the die cavities, cut a groove into the surface of the tube. The groove matches the shape of the cut end edge desired, and locally increases the electrical resistance of the tube at the groove, but does not cut all the way through the tube wall. Then, a high electrical current is applies to the tube to either side of the groove, which selectively heats and melts the tube at the higher resistance grooved area.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile