Compagnie Internationale Pour L'informatique

Yves H Thorn

Michel Sineau

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.

Growing community of inventors

La Celle Saint Cloud, France

Yves H Thorn