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:
Dec. 18, 2007
Filed:
Apr. 14, 2005
Applicants:
Larry A. Brey, Woodbury, MN (US);
Simon J. Smith, Glenburnie, CA;
Glenn E. Weagle, Mallorytown, CA;
Inventors:
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B01D 20/20 (2006.01);
U.S. Cl.
CPC ...
Abstract
Filter systems that are effective against a broad range of contaminants including HCN, cyanogen chloride (CK), acid contaminants. and basic contaminants such as ammonia without the need (but with the option, if desired) for using molybdenum or chromium containing materials. The filtering systems of the present invention include a tungsten-based material and other impregnants incorporated into a substrate such as filter media particles.