Multilayer printed circuit board

Details Multilayer printed circuit board Multilayer printed circuit board

1988-11-01

1990-06-05

Ryan, Patrick

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428210, 428426, 428432, 428433, 428901, 501119, 501120, 501125, 501 66, 501 77, 501153, 501154, 174266, 361397, B32B 900

Patent

active

049313541

ABSTRACT:
A multilayer printed circuit board comprises plural insulating layers integrated into one body, and internal wiring conductor layers located on the internal insulating layers, characterized in that conductor paths in each internal conductor layer are locally separated from the insulating layer by a cavity or porous layer provided at the boundaries between the path and insulating layer adjacent thereto. At least one insulating layer between internal conductor layers may be provided with a layered space or porous layer therein.

REFERENCES:
patent: 4502939 (1985-03-01), Holfelder et al.
patent: 4627160 (1986-12-01), Herron et al.

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