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:
Sep. 13, 2005
Filed:
May. 10, 2000
Ronald Neufert, Michelau, DE;
Frank Witzel, Bloomfield Hills, MI (US);
Stefan Fischer, Lichtenfels, DE;
Günther Pajonk, Zapfendorf, DE;
Ronald Neufert, Michelau, DE;
Frank Witzel, Bloomfield Hills, MI (US);
Stefan Fischer, Lichtenfels, DE;
Günther Pajonk, Zapfendorf, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
To reduce the number of particles in an exhaust gas (A), in particular in the exhaust gas (A) from an internal-combustion engine, sulfur dioxide SOwhich is contained in the exhaust gas (A) is at least partially catalytically oxidized, in the presence of ammonia NHin a catalytic converter system having a catalytic activity which increases in the direction of flow, to form sulfur trioxide SO. The simultaneous presence of sulfur trioxide SOand ammonia NHin the exhaust-gas stream which is brought about in this way results in an agglomeration of the small and very small particles and reduction in the number thereof.