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:
Nov. 16, 2010
Filed:
Mar. 13, 2008
David R. Jensen, Swartz Creek, MI (US);
Mike M. Ghiran, Lake Orion, MI (US);
Paul D. Larsen, Fenton, MI (US);
Terry A. Kent, East China, MI (US);
David R. Jensen, Swartz Creek, MI (US);
Mike M. Ghiran, Lake Orion, MI (US);
Paul D. Larsen, Fenton, MI (US);
Terry A. Kent, East China, MI (US);
GM Global Technology Operations, Inc., Detroit, MI (US);
Abstract
A system for hydroforming a workpiece containing fluid at elevated pressure includes a die in which the workpiece is formed, a source of control pressure, a tank at low pressure, and a valve that includes a displaceable control element that alternately moves between an open state and a closed state, opening and closing, respectively, a passage that hydraulically connects the fluid in the workpiece and the tank in response to the relative magnitudes of a first force applied to the control element by the control pressure source and a second force applied to the control element by pressure of the fluid in the workpiece acting on the control element in opposition to the first force.