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:
Jul. 26, 1977
Filed:
Jun. 17, 1975
Applicant:
Inventors:
Claude Puech, Paris, FR;
Claude Bricot, Paris, FR;
Bernard Carre, Paris, FR;
Jean Claude Dubois, Paris, FR;
Francois Le Carvennec, Paris, FR;
Jean Claude Lehureau, Paris, FR;
Assignee:
Thomson-Brandt, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B32B / ; G11B / ; G11C / ;
U.S. Cl.
CPC ...
235 / ; 156300 ; 1791 / ; 235 / ; 3401 / ;
Abstract
The present invention relates to the protecting against scratching and fouling of a data carrier which carries a relief impression readable optically by transmission. The data carrier in accordance with the invention is protected by a transparent protective layer with substantially smooth faces, which adheres to the peaks in the relief of the impression in such a way as to prevent the troughs in said relief from being filled up.