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:
Sep. 04, 1984
Filed:
Dec. 01, 1983
James W O'Neil, Howell, NJ (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process for preparing a two layer printed circuit having conductive interconnections wherein at least one layer of a photoadhesive composition is applied to a substrate bearing an electrically conductive circuit pattern and exposing said photoadhesive layer or layers through a circuit image of three different optical densities, i.e., zero, gray and opaque, removing portions of the photosensitive layer by solvent washout, applying finely divided metal, alloy or plating catalyst to adherent image areas, optionally curing the printed circuit, e.g., heating or ultraviolet exposure and plating to form an interconnected electrically conductive circuit pattern. Multilayer printed circuits can also be prepared by repeating the steps using additional layers of photoadhesive material.