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:
Mar. 02, 1982
Filed:
Nov. 29, 1979
Petrus J Kivits, Eindhoven, NL;
Marinus R de Bont, Eindhoven, NL;
Adriaan W de Poorter, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
An optical recording disc which comprises a disc-shaped substrate plate, for example, a plate manufactured from synthetic resin, for example, polymethylmethacrylate, which has on at least one side an ablative recording layer, for example, an amorphorous layer of a tellurium mixture, in which the substrate on the side of the recording layer has extrinsic instabilities, in particular surface discontinuities. For example, the surface of the substrate is roughened or provided with scratches. The substrate may also be provided with a separate coating layer comprising the discontinuities, for example, an inhomogeneous vapor-deposited layer, a coarse-granular layer of a dye, or a light-cured lacquer layer which has been roughened or provided with scratches.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile