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:
Nov. 24, 1987
Filed:
Nov. 25, 1986
Applicant:
Inventors:
Albertus G Dirks, Eindhoven, NL;
Hidde H Brongersma, Waalre, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369275 ; 369288 ; 369283 ; 428 65 ; 430495 ;
Abstract
An optically readable information disc having a supporting plate which on at least one side has a layer of synthetic resin in which an optically readable structure has been provided which is covered with a layer of a metal alloy which is selected from the group consisting of a Ag-Cu alloy with more than 40 at.% Ag, a Cu-Cr alloy with more than 8 at.% Cr, an Al-Cr alloy with more than 75 at.% Al, an Al-Cu alloy with more than 40 at.% Al, an Al-B alloy with more than 70 at.% Al, an Al-Mn alloy with at least 75 at.% Al and an Al-lanthanide alloy with 0.1 to 3 at.% of the lanthanide.