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:
May. 10, 2011
Filed:
Aug. 12, 2008
Mike M. Ghiran, Lake Orion, MI (US);
Ranny Joe Nunley, Metamora, MI (US);
David R. Friddell, Grand Blanc, MI (US);
William M. Crantas, Highland, MI (US);
Kevin R. Marks, Durand, MI (US);
David R. Jensen, Swartz Creek, MI (US);
Paul D. Larsen, Fenton, MI (US);
Mike M. Ghiran, Lake Orion, MI (US);
Ranny Joe Nunley, Metamora, MI (US);
David R. Friddell, Grand Blanc, MI (US);
William M. Crantas, Highland, MI (US);
Kevin R. Marks, Durand, MI (US);
David R. Jensen, Swartz Creek, MI (US);
Paul D. Larsen, Fenton, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A hydroform die includes a plurality of seal units to provide fluid to die cavities. The plurality of seal units each define a piston cylinder. A piston is located within the cylinder and is selectively moveable between an open and a closed position. Additionally, the piston at least partially defines a valve chamber located on a first side of the piston and a piston chamber located on a second side of the piston. A piston fluid passage is defined by the piston to fluidly connect the valve chamber and the piston chamber.