Patent ID: 7353590

Claim:
A method of forming a printed circuit card wherein said printed circuit card includes a metal layer sandwiched between a first dielectric layer and a second dielectric layer, wherein said first and second dielectric layer each have circuitry formed upon them, and said printed circuit card further includes an external border along the perimeter of said printed circuit card that extends from the perimeter of said printed circuit card to said circuitry, comprising the steps of: i. providing said layer of metal having opposite sides; ii. providing said first and second layers of photoimageable, curable dielectric material on the opposite sides of said layer of metal; iii. photopatterning said first and second layers of said curable photoimageable material in a pre-selected pattern, the pre-selected pattern on said first layer of photoimageable material including a pattern on said external border and the pre-selected pattern on said second layer of photoimageable material being free of a pattern on said external border; iv. thereafter developing the pre-selected pattern on said first layer of said photoimageable material to reveal portions of said metal layer through vias and said external border, and developing the pre-selected pattern on said second layer of said photoimageable material to reveal portions of said metal layer through vias, but not removing said second layer of photoimageable material on said external border; v. thereafter metallizing each of said first and said second layers to form said circuitry on said first and second layers of said photoimageable material and vias in said first and second layers of photoimageable material with photolithographic techniques and etching the metal exposed at said external border through said first layer to thereby provide a substrate which has an edge defined by the second layer of said photoimageable material extending beyond the edge of said circuitry.