Chemistry: electrical and wave energy – Processes and products
Patent
1987-02-06
1989-10-24
Tufariello, T. M.
Chemistry: electrical and wave energy
Processes and products
204 24, 204273, C25D 502, C25D 1700
Patent
active
048759821
ABSTRACT:
A novel product and product by process is disclosed. The product is a uniform electrically-conductive coating on an insulative substrate, which coating is formed onto a printed circuit substrate having high aspect ratio holes (with an aspect ratio of 6:1 or higher) therein.
Planting of high aspect ration holes is accomplished by offset longitudinally spaced-apart manifolds submerged in an electrolyte bath together with the printed circuit substrate moving back and forth in the space between the manifolds. A pump in a closed circulation system creates a vacuum in each manifold. The manifold portions adjacent to the printed circuit substrate include slots in a smooth curved front nose of the manifold to cause the electrolyte to be moved through the holes and in a sweeping vortex movement across the board's surface nearest to the manifold slots. A vacuuming action in the offset manifolds together with sufficient board movement assures a 1:1 ration of electroplating on the board's surface and in the hole walls of the high aspect ratio holes.
REFERENCES:
patent: 4397715 (1983-08-01), Mohan et al.
patent: 4445978 (1984-05-01), Whartenby et al.
Tufariello T. M.
Velie Circuits, Inc.
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