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:
May. 12, 1998
Filed:
Sep. 21, 1995
Jeffrey Scott Hepburn, Dearborn, MI (US);
Eva Thanasiu, Trenton, MI (US);
William Lewis Watkins, Toledo, OH (US);
Carolyn Parks Hubbard, Dearborn Heights, MI (US);
Douglas A Dobson, Livonia, MI (US);
Haren Sakarlal Gandhi, Farmington Hills, MI (US);
Ford Global Technologies, Inc., Dearborn, MI (US);
Abstract
The invention is a nitrogen oxide trap separate catalyst phases. One of the phases is platinum on a porous support and another is alkali metal or elements and alkaline earth elements on another porous support. The phases may be provided as an intimate mixture or as layers in the trap. The trap may be used in an internal combustion engine exhaust gas catalyst system. During lean-burn operation of the engine the trap adsorbs nitrogen oxides and releases the nitrogen oxides during decreased oxygen concentration in the exhaust gas.