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:
Jun. 18, 2002
Filed:
Oct. 08, 1999
Applicant:
Inventors:
Philip D. Eitzman, Lake Elmo, MN (US);
Alan D. Rousseau, Stillwater, MN (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D06B 3/00 ; B01D 3/916 ;
U.S. Cl.
CPC ...
D06B 3/00 ; B01D 3/916 ;
Abstract
A method for imparting an electrostatic charge to a nonwoven fibrous web . The fibrous web is wetted with a wetting liquid , followed by being saturated with an aqueous polar liquid and drying . The resulting dried product is an electret article that could be used as an air filter in, for example, a respirator