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:
Jul. 05, 1994
Filed:
Mar. 29, 1993
Applicant:
Inventor:
Karl-Heinz A Starzewski, Bad Vilbel, DE;
Assignee:
Agfa-Gevaert AG, Leverkusen, US;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
264-13 ; 264 24 ; 264 78 ; 264108 ; 264185 ; 264204 ; 2642102 ; 2642884 ; 264291 ;
Abstract
The process for manufacturing a polarizing film based on polyvinyl alcohol and at least one dichroic substance by casting or extrusion of a mixture of polyvinyl alcohol and a solvent, whereby the polyvinyl alcohol contains the dichroic substance, drying and stretching of the film by between 300 and 1200%, whereby, depending on the width of the unstretched film b.sub.o, a stretch gap l.sub.o is provided, satisfying the condition b.sub.o /l.sub.o <3, leads to higher dichroic extinction quotients.