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. 11, 1979
Filed:
Dec. 21, 1977
Applicant:
Inventors:
Jan van Turnhout, Pijnacker, NL;
Johannes C Rieke, Delft, NL;
Assignee:
N. V. Verto, Rotterdam, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B03C / ; B29C / ;
U.S. Cl.
CPC ...
55155 ; 55528 ; 55DI / ; 55DI / ; 264 22 ; 264230 ; 2643 / ; 264D / ; 428369 ;
Abstract
A method for forming a filter of electrically charged electret fiber material, consisting of a high molecular weight, nonpolar polymeric substance, comprising drawing, charging, and fibrillating a foil of said high molecular weight substance. The fibrillated foil is wound and then crimping is effected.
van Turnhout, Jan. (1979). Method for manufacturing a filter of electrically charged electret fiber (U.S. Patent No. 4178157). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4178157
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile