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:
Jan. 12, 1999
Filed:
Nov. 24, 1997
Scott Christopher Blanchet, Imlay City, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
An exhaust poison trap for protection of catalytic converters in automotive exhaust systems includes a tubular housing having open ends and a peripheral wall internally defining an exhaust chamber, a helical wall longitudinally dividing the exhaust chamber into at least two longitudinally extending helical passages for exhaust gas flow and porous means substantially covering the interior of the peripheral wall and forming an outer periphery of each of said helical passages, whereby exhaust gas passing through the exhaust chamber is directed in a helical path through the helical passages, causing particulate matter in the gas to be accelerated outwardly by centrifugal force and trapped in the porous means, thus protecting a downstream catalytic converter from trapped catalyst poisoning particles such as zinc and phosphorous. The porous means may be coated to improve trapping or to aid catalytic reactions in the exhaust gases.