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. 07, 2004
Filed:
Jul. 25, 2002
Applicant:
Inventors:
James E. Springett, Hudson, WI (US);
Seyed Abolhassan Angadjivand, Woodbury, MN (US);
Assignee:
3M Innovative Properties Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D 3/902 ; B03C 3/00 ;
U.S. Cl.
CPC ...
B01D 3/902 ; B03C 3/00 ;
Abstract
A filter element that comprises a porous molded web ′ that contains thermally bonded staple fibers and non-thermally bonded electrically charged microfibers . The molded web is retained in its molded configuration, at least in part, by bonds between the staple fibers at points of fiber intersection . The web may be molded, for example, into the shape of filtering face mask