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. 04, 1984
Filed:
Sep. 17, 1982
Bruno Kliemann, Freiburg, DE;
Martin Stoll, Freiburg-Hochdorf, DE;
Rhodia AG, Freiburg, DE;
Abstract
A method for the production of electret filaments or fibers from high molecular weight substances is described which consists of melting the substances and extruding them through die orifices, electrically charging, polarizing and cooling the formed filaments or fibers and the electrically charging and polarization is carried out immediately prior to the issuance or during the issuance from the die orifices while the substances are in a molten state. The device for electric charging and polarizing consists either of an electrode (2) provided with one point or several points (1) which except for the point or points (1) is coated with or surrounded by an electrically insulating material, one point (1) inside the die (3) being disposed directly in front or protruding into a die orifice (4) or of an electrode (9) provided with one point or several points (8) completely coated with or surrounded by an electrically insulating material, one point (8) inside the die (3) being disposed directly in front or protruding into a die orifice (4), and of a counterelectrode (10) which is not coated with or surrounded by an electrically insulating material and which is inside the die (3) but not disposed directly in front of or protruding into the die orifices (4).