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:
Oct. 31, 1989
Filed:
Dec. 19, 1988
Applicant:
Inventors:
Dennis D Leatherman, Pittsburgh, PA (US);
Thomas Rechlicz, Clinton, OH (US);
Richard A Schwarz, Akron, OH (US);
Assignee:
PPG Industries, Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ;
U.S. Cl.
CPC ...
428224 ; 428225 ; 428245 ; 428253 ; 428254 ; 428255 ; 428280 ; 428281 ; 428283 ; 428290 ; 4283155 ; 4283157 ; 4283166 ; 4283179 ;
Abstract
A multilayer article comprises at least one layer of substantially porous material bonded to at least one layer of microporous material comprising a matrix consisting essentially of linear ultrahigh molecular weight polyolefin, a large proportion of finely divided, water-insoluble siliceous filler, and interconnecting pores. The microporous material has regions of stretch-induced molecularly oriented polymer in the matrix.