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:
May. 08, 1979
Filed:
Mar. 22, 1977
Applicant:
Inventor:
Eckhard C Schwarz, Neenah, WI (US);
Assignee:
Biax-Fiberfilm Corporation, Neenah, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; B29L / ; B29D / ;
U.S. Cl.
CPC ...
428304 ; 264131 ; 264134 ; 264154 ; 264160 ; 264D / ; 428411 ; 428454 ; 428500 ;
Abstract
There is disclosed a novel process and apparatus for selectively stretching incremental portions of a film of material comprised of a blend of a thermoplastic orientable polymer and an incompatible second phase selected from the group consisting of an incompatible polymer or inorganic material or a polymer matrix having an inorganic filler. The film is introduced into the nip of interdigitating rollers with the concomitant controlling of the velocity of film introduction to substantially the identical velocity of the surface velocity of the rollers to form an opaque, low density, microporous film or sheet of material.