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. 06, 2011
Filed:
Feb. 12, 2008
Stephen W. Powell, South Lyon, MI (US);
Mark A. Vernacchia, Northville, MI (US);
Brian W. Whitmarsh, Commerce, MI (US);
Ryan M. Jenness, Ypsilanti, MI (US);
Stephen W. Powell, South Lyon, MI (US);
Mark A. Vernacchia, Northville, MI (US);
Brian W. Whitmarsh, Commerce, MI (US);
Ryan M. Jenness, Ypsilanti, MI (US);
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A pressure assisted park servo assembly for an automatic transmission includes a servo or spool valve which receives pressurized hydraulic fluid from various sources including two solenoid valves and transmission ports. The servo valve controls two flows of pressurized hydraulic fluid to a servo assembly to place the transmission in or release it from park. The improved park servo assembly exhibits enhanced operating speed.