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. 16, 2006
Filed:
Oct. 16, 2002
Jann Schmidt, Darmstadt, DE;
Guenther Ittmann, Gross-Umstadt, DE;
Hans Lichtenstein, Reinheim, DE;
Herbert Groothues, Weiterstadt, DE;
Jann Schmidt, Darmstadt, DE;
Guenther Ittmann, Gross-Umstadt, DE;
Hans Lichtenstein, Reinheim, DE;
Herbert Groothues, Weiterstadt, DE;
Roehm GmbH & Co. KG, Darmstadt, DE;
Abstract
The present invention relates to a light-guide body, which has at least one light-entry surface and at least one light-exit surface, the ratio of the light-exit surface area to the light-entry surface area being at least 4, comprising at least one light-guiding layer with a thickness of at least 2 mm, characterized in that the light-guiding layer comprises at least 60% by weight, expressed in terms of the weight of the light-guiding layer, of polymethyl methacrylate and from 0.001 to 0.08% by weight, expressed in terms of the weight of the light-guiding layer, of spherical barium sulphate particles with an average diameter in the range of from 0.3 to 20 μm.