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:
Aug. 29, 1989
Filed:
Nov. 26, 1985
Applicant:
Inventors:
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03F / ; G11B / ;
U.S. Cl.
CPC ...
430321 ; 430156 ; 430312 ; 430314 ; 430320 ; 430326 ; 430945 ; 346 / ; 3461351 ; 346137 ; 369 94 ; 369275 ; 369286 ; 369288 ; 503201 ;
Abstract
A method of manufacturing an optical master disk, matrix derived from the master disk and synthetic resin information disk derived from the matrix. A method of manufacturing an optical master disk in which a supporting plate is provided on one side with at least two layers of a photosensitive material in which, taken from the supporting plate, the photosensitivity of the material of the layers increases and/or in which a light-absorbing separation layer is used between the layers, as well as a metal matrix derived from the master disk and an optically readable information disk of synthetic resin derived from the matrix.