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. 02, 1977
Filed:
Jun. 17, 1975
Applicant:
Inventors:
Claude Bricot, Paris, FR;
Bernard Carre, Paris, FR;
Jean Claude Lehureau, Paris, FR;
Claude Puech, Paris, FR;
Assignee:
Thomson-Brandt, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
1791 / ; 1791 / ; 274 / ;
Abstract
A flexible record disc engraved in the form of impressions along a track located in a ring-shaped zone is protected with a second flexible disc adhering at its central portion to the non-engraved part of the record disc. In the case where read-out is carried out on a stabilizing air cushion, the air remaining between the two discs is displaced by centrifugal force, so that good conditions of optical read-out are achieved.