H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/12
H05K 3/06 (2006.01) G03F 7/28 (2006.01) H05K 3/10 (2006.01) H05K 3/18 (2006.01) H05K 3/24 (2006.01) H05K 3/46 (2006.01) H05K 3/00 (2006.01) H05K 3/34 (2006.01) H05K 3/40 (2006.01)
Patent
CA 1131790
ABSTRACT OF THE DISCLOSURE By the process of this invention, two-layer printed circuits having conductive interconnections are prepared by applying a photoadhesive layer to a substrate bearing an elec- trically conductive circuit pattern, exposing the photoadhesive layer to a circuit image related to the circuit pattern to pro- duce adherent circuit image areas having segments overlying the circuit pattern, applying metal powder to the adherent image areas, exposing the resultant image areas to an image of the overlying segments, removing the overlying segment areas of the photoadhesive layer with a suitable solvent, and soldering or plating the resultant image areas to form an electrically con- ductive pattern interconnected with the underlying circuit pattern.
321420
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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