Title: Data carrier optically readable by transmission and method of manufacturing such a data carrier

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.

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Inventors: Puech, Claude (Paris, FR)
Bricot, Claude (Paris, FR)
Carre, Bernard (Paris, FR)
Dubois, Jean Claude (Paris, FR)
Le Carvennec, Francois (Paris, FR)
Lehureau, Jean Claude (Paris, FR)

Application Number: 588158
Filing Date: 1975-06-17
Publication_date: 1977-07-26
Assignee: Thomson-Brandt (Paris, FR)
Primary Class(es): 369/61 156/300, 235/487, 369/109.01, 369/275.4, 369/275.5, 369/286
Other Classes:
US Patent Ref:

3313052	Apr, 1967	Malster	40/2.
3430966	Mar, 1969	Gregg	179/100.
3536894	Oct, 1970	Travioli	235/61.
3586593	Jan, 1971	Dahl	235/61.
3786238	Jan, 1974	Heisner	235/61.
3829662	Aug, 1974	Furahashi	235/61.
3846843	Nov, 1974	Franer	360/135.
3913076	Oct, 1975	Lehureau	340/173.

Other Refs:
Primary Examiner: Kilgore, Robert M.
Assistant Examiner:
Attorney: Cushman, Darby & Cushman