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:
May. 25, 1993
Filed:
Nov. 02, 1988
Johannes P Van Liempd, Eindhoven, NL;
Josephus M Wijn, Eindhoven, NL;
George H Johnson, Wilmington, DE (US);
Howard E Simmons, Newark, DE (US);
U.S. Philips Corporation, Nieuwegein, NY (US);
Du Pont Optical Company, Nieuwegein, NL;
Abstract
The invention relates to a method of manufacturing a metal matrix suitable for use in the manufacture of optical discs, in which a master plate is used which comprises a recording double layer of a synthetic resin in which each layer comprises a laser light-absorbing dye, the master plate is exposed to modulated laser light in which the laser light in both layers of the recording layer is absorbed and in which as a result of the exposure information bits are formed in the form of bumps having variable longitudinal dimensions and the same width dimensions and the master plate on the side of the recording layer comprises a metal layer which is separated from the master plate, as well as a master plate which is suitable for use in the method described hereinbefore.