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:
Apr. 02, 1991
Filed:
Oct. 17, 1989
Maarten A Van Andel, Eindhoven, NL;
Johannes P Van Liempd, Eindhoven, NL;
Josephus M Wijn, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
The master disc contains a substrate plate which is preferably provided with an optically detectable guide track and a recording layer of polysulphone such as poly(1-butene sulphone) to which, preferably, a colorant is added and in which an optically readable information track is provided by patterned exposure, a pit or groove being formed in the polysulphone layer. A matrix is formed by applying a metal layer to the polysulphone layer by means of an electroless deposition process and then, applying a further metal layer by means of an electrodeposition process or applying a curable synthetic resin layer together with a metal disc, after which the synthetic resin is made to cure.