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. 13, 1976
Filed:
Feb. 11, 1973
Applicant:
Inventors:
Yves H Thorn, La Celle Saint-Cloud, FR;
Michel Sineau, Sartrouville, FR;
Assignee:
Compagnie Internationale pour l'Informatique, Louveciennes, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05D / ; H01L / ;
U.S. Cl.
CPC ...
156-3 ; 156 11 ; 156 18 ; 427 96 ; 427 99 ;
Abstract
For avoiding the formation of sharp edges and lateral depressions in the conductors engraved from a conductive layer coated over an insulating surface, a thin film of a conductive material other than the conductive material of the layer is first coated over the said layer. After deposition of a mask of resist over said film, two successive engraving operations are made, the first one with a first acid solution inactive with respect to the material of the layer, the second one with a second acid solution inactive with respect to the material of the film.