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:
Dec. 19, 1989
Filed:
Mar. 13, 1987
Applicant:
Inventors:
Jean-Pierre Lacotte, Paris, FR;
Claude Puech, Paris, FR;
Assignee:
Thomson Brandt, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ; G03C / ; G03C / ; G01D / ;
U.S. Cl.
CPC ...
430141 ; 346-11 ; 346 / ; 3461351 ; 346137 ; 369272 ; 369275 ; 369283 ; 369284 ; 369285 ; 369287 ; 369288 ; 430-1 ; 430-5 ; 430-8 ; 430 11 ; 430 17 ; 430 23 ; 430146 ; 430147 ; 430148 ; 430269 ; 430321 ; 430332 ; 430334 ; 430367 ; 430395 ; 430396 ; 430390 ; 430393 ; 430495 ; 430945 ;
Abstract
The invention relates to a process for producing supports intended for the optical recording and reading of information. A layer containing a diazo compound is deposited onto a metallized substrate. Recording is obtained by exposing the support to light through a mask, the exposed zones of the layer of diazo compound being decomposed. Dry development in ammonia vapors shows up transparent zones and opaque zones corresponding to the information.