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. 27, 1987
Filed:
Aug. 09, 1985
Karl-Heinz Etzbach, Frankenthal, DE;
Peter Neumann, Wiesloch, DE;
Matthias Dust, Mannheim, DE;
Helmut Ringsdorf, Mainz-Gonsenheim, DE;
Hans-Werner Schmidt, Mainz, DE;
Guenter Baur, Freiburg, DE;
Friedrich Windscheid, Freiburg, DE;
Rudolf Kiefer, Voerstetten, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
An optical recording medium contains, on a base, one or more dyes and a polymer which forms liquid-crystalline phases. The information is written into the uniformly oriented liquid-crystalline polymer layer, for example by means of a laser. During this procedure, the polymer heats up locally to above a phase transition temperature. By cooling, the resulting change is frozen in the glass state. The information can be erased by applying an electric field and/or heating. The recording material permits high-contrast storage and possesses high sensitivity, good resolution and excellent stability.