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:
Apr. 23, 2002
Filed:
Oct. 08, 1999
Seyed A. Angadjivand, Woodbury, MN (US);
Michael G. Schwartz, Hugo, MN (US);
Philip D. Eitzman, Lake Elmo, MN (US);
Marvin E. Jones, Grant, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A method and apparatus for charging fibers that contain a nonconductive polymer. A polar liquid is sprayed onto free-fibers and the free-fibers are then collected to form an entangled nonwoven fibrous web that may contain a portion of the polar liquid. The nonwoven web is then dried By applying an effective amount of polar liquid onto the nonconductive free-fibers before forming the nonwoven web followed by drying the individual fibers become charged. The method and apparatus enable the fibers to be charged during web manufacture without subsequent processing.