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:
Jan. 25, 1994
Filed:
Dec. 20, 1991
Applicant:
Inventors:
Burton M Rein, Mountain Lakes, NJ (US);
Howard J Troffkin, Potomac, MD (US);
Robert M Spotnitz, Catonsville, MD (US);
Richard T Giovannoni, Columbia, MD (US);
Yihong Guo, Columbia, MD (US);
Assignee:
W. R. Grace & Co., New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01M / ;
U.S. Cl.
CPC ...
429 62 ; 429145 ;
Abstract
The present invention is directed to a multi-ply unfilled microporous sheet product composed of at least one first ply and at least one second ply which are, respectively, formed from polymeric compositions having different rheological properties and to a method of forming said sheet product.