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. 21, 1989
Filed:
Feb. 10, 1987
Horst Redlich, Berlin, DE;
Gunter Joschko, Berlin, DE;
DMM Master Technik GmbH fur Informationstrager, Berlin, DE;
Abstract
A method for producing a prerecorded disk-shaped die is specified in which the information signal is recorded onto a metallic recording medium. According to the invention, the information carrier layer consisting of base metal is first vapor-deposited onto a glass base. Then the information signal is recorded onto the surface of the information layer with the aid of a cutting or stamping tool. Following this, a metallic interlayer of precious metal is galvanized on, onto which another base layer particularly of metal, is then galvanized. After the glass base has been mechanically separated, the information carrier layer can then simply be removed by a chemical medium which does not attack the interlayer. The method according to the invention is particularly suitable for producing dies for digital sound recording according to the compact disk process.