Multilayered circuit board forming method and multilayered...

Metal working – Method of mechanical manufacture – Electrical device making

Reexamination Certificate

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Details

C029S825000, C029S830000, C029S846000, C156S233000, C156S247000

Reexamination Certificate

active

06971167

ABSTRACT:
A multilayered circuit board and a method of forming the multilayered circuit board are provided. In a first circuit forming process, a first circuit is formed on an insulating board with a conductor; in a circuit embedding process, the first circuit is embedded in the insulating board so as to have a predetermined surface flatness and a predetermined parallelism; in a masking process, a pilot hole for a via hole is masked at a part of a surface of the circuit; in an insulating layer forming process P5p, an insulating material is applied as a layer to the surface except that portion thereof covered by the mask; in an insulating material layer flattening process, the surface of the insulating material layer is flattened so as to have the predetermined surface flatness and the predetermined parallelism; and in a pilot hole forming process, the mask is removed.

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patent: 5114518 (1992-05-01), Hoffarth et al.
patent: 5199163 (1993-04-01), Ehrenberg et al.
patent: 5592737 (1997-01-01), Middelman et al.
patent: 10-335787 (1998-12-01), None

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