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. 05, 2019
Filed:
Jul. 03, 2014
Herbert Groothues, Frankfurt, DE;
Jann Schmidt, Weiterstadt, DE;
Wangelis Karampougioukis, Darmstadt, DE;
Stephan Neumayer, Frankfurt, DE;
Helmut Haering, Otzberg, DE;
Berthold Schoenig, Rossdorf, DE;
Herbert Groothues, Frankfurt, DE;
Jann Schmidt, Weiterstadt, DE;
Wangelis Karampougioukis, Darmstadt, DE;
Stephan Neumayer, Frankfurt, DE;
Helmut Haering, Otzberg, DE;
Berthold Schoenig, Rossdorf, DE;
EVONIK ROEHM GmbH, Darmstadt, DE;
Abstract
A process for producing a light guide plate includes producing a colorless transparent sheet from a colorless transparent material by extrusion with a polishing stack. A printed reflector film is laminated in-line to the colorless transparent sheet. The printed reflector film includes: a thermoplastic reflector film which is opaque white or translucent white and made of a thermoplastic material; and a colorless thermoplastic printed on the thermoplastic reflector film. There is no direct optical contact between the colorless transparent sheet and the thermoplastic reflector film. A glass transition temperature of the printed colorless thermoplastic is above 25° C. and below glass transition temperatures of the colorless transparent material of the colorless transparent sheet and of the thermoplastic material of the thermoplastic reflector film.