Electrolysis: processes – compositions used therein – and methods – Electroforming or composition therefor – Electrical product
Patent
1991-08-30
1993-05-04
Tufariello, T. M.
Electrolysis: processes, compositions used therein, and methods
Electroforming or composition therefor
Electrical product
C25D 120
Patent
active
052078876
ABSTRACT:
A circuit is produced by using a formed mandrel (10,12) and semi-additive techniques for creating circuit traces. A stainless steel mandrel (10) flash plated with copper (14) includes a depression (12) which will form a raised interconnection feature (24). Using a photolithographically formed pattern of photoresistive material (16) on the mandrel the selected pattern of circuit traces (18,20) and raised features (24) are electroplated onto the flash plated mandrel. After stripping the photoresist (16), a dielectric substrate (26) is laminated to the circuit traces, effectively encapsulating the traces on three sides. After removing the laminated circuit traces and dielectric from the mandrel the flash plated copper (14) is removed and the circuit covered with an insulation coverlay.
REFERENCES:
patent: 3181986 (1965-05-01), Pritikin
patent: 4125441 (1978-11-01), Dugan
Crumly William R.
Schreiber Christopher M.
Swarbrick David B.
Denson-Low Wanda K.
Gudmestad Terje
Hughes Aircraft Company
Tufariello T. M.
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