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. 14, 2004
Filed:
Oct. 30, 2001
John B. Paine, III, Midlothian, VA (US);
Philip Morris Incorporated, New York, NY (US);
Abstract
Catalytically active carbons are used in cigarette filters for selective oxidation of selected gas phase components in cigarette smoke. The carbons are impregnated with transition metals and sulfur and/or nitrogen ligation. The catalytic activity of the carbon is significantly improved by introducing catalytically active sites by heat treatment in the range of 500-1000° C. in the presence of transition metals and nitrogenous or sulfurous materials. Furthermore, introduction of such metalliferous sites into a active carbon can improve the absorptive affinity of the active carbon for classes of compounds, including aliphatic dienes and aromatic hydrocarbons.