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:
Mar. 12, 1991
Filed:
Jun. 13, 1990
Karen M Meyer, Avon, NY (US);
Michael D Liggett, Rochester, NY (US);
Robert J Conklin, Rochester, NY (US);
Charles J Barker, Rochester, NY (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An exhaust gas recirculation valve assembly for controlling the recirculation of exhaust gas in an internal combustion engine has an electrically operated valve member that meters flow of exhaust gas through an exhaust gas chamber. A valve member has a valve stem extending to an actuator which is isolated from the base housing the exhaust gas, and the valve is surrounded by a pair of spring-biased seals that seal openings around the valve stem into the actuator and the exhaust gas chamber. The seal closing the actuator opening has an inverted, cup-shaped configuration which encloses the valve stem between the actuator and the base thereby preventing impingement thereon of contaminants which could be carried into the actuator.