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:
Oct. 13, 1987
Filed:
Apr. 21, 1986
Applicant:
Inventor:
Gordon R Paddock, Rochester, NY (US);
Assignee:
General Motors Corporation, Detroit, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F16K / ;
U.S. Cl.
CPC ...
137885 ; 137881 ; 137883 ; 251 45 ; 60289 ;
Abstract
In an exhaust emission control system for an automotive internal combustion engine, an air control valve assembly either directs air flow provided by an engine driven air pump to the engine exhaust ports or to an exhaust system catalytic converter, or diverts the air flow away from the exhaust system. The air control valve assembly has a single diaphragm with three independent diaphragm valve elements, each operated by the air pump discharge pressure.