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:
Nov. 03, 1998
Filed:
May. 26, 1995
Applicant:
Inventors:
Raymond William Singleton, Cirencester, GB;
John Anthony Cook, Faringdon, GB;
Kenneth Gargan, Swindon, GB;
Assignee:
Scimat Limited, , GB;
Primary Examiner:
Int. Cl.
CPC ...
H01M / ;
U.S. Cl.
CPC ...
429254 ; 429222 ; 429223 ; 442170 ; 442171 ;
Abstract
A polymeric sheet, which is particularly suited for use as a separator in an electrochemical device, is formed by graft copolymerizing acrylic acid, or another vinyl monomer capable of reacting with an acid or a base to form a salt directly or indirectly with fibers of a non-woven sheet, whose outer surface is provided by a polyolefin, especially polypropylene. The polyolefin is crosslinked as a result of the polymerization reaction. The polymerization reaction is preferably initiated by exposure of the sheet to ultraviolet radiation, after impregnation with an appropriate solution of the vinyl monomer.