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:
Aug. 29, 2006
Filed:
Mar. 16, 2004
Robert James Brisley, Cambridge, GB;
Martyn Vincent Twigg, Cambridge, GB;
Anthony John Joseph Wilkins, Essex, GB;
Robert James Brisley, Cambridge, GB;
Martyn Vincent Twigg, Cambridge, GB;
Anthony John Joseph Wilkins, Essex, GB;
Johnson Matthey Public Limited Company, London, GB;
Abstract
A wall-flow filter () for an exhaust system of a combustion engine comprises: a plurality of channels () in honeycomb arrangement, wherein at least some of the channels () are plugged () at an upstream end and at least some of the channels () not plugged at the upstream end are plugged () at a downstream end; an oxidation catalyst () on a substantially gas impermeable zone at an upstream end of the channels () plugged at the downstream end; and a gas permeable filter zone () downstream of the oxidation catalyst for trapping soot, characterised in that in an exhaust system, preferably a diesel exhaust system, the oxidation catalyst is capable of generating sufficient NOfrom NO to combust the trapped soot continuously at a temperature less than 400° C.