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. 29, 1990
Filed:
Jan. 26, 1979
Applicant:
Inventor:
Jan G Dil, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
3692751 ; 369109 ;
Abstract
A record carrier is described having an optically readable information structure comprising information areas arranged in information tracks and spaced from each other by intermediate areas. The information areas have a first, comparatively large, phase depth and the intermediate areas have a second, comparatively small, phase depth thereby providing an optimum information signal and an optimal tracking signal during reading.