Production of semiconductor devices

Details Production of semiconductor devices Production of semiconductor devices

1977-11-17

1978-10-03

Esposito, Michael F.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 98, 427264, 427271, 427307, 156633, 156634, 156644, 156656, 156668, B05D 512, H05K 300

Patent

active

041185234

ABSTRACT:
A method of forming very small diameter holes in a flexible substrate by coating both sides of substrate with metal layers; etching layers and substrate at places where holes required, removing small ring of the metal layers surrounding holes to remove any overhang of metal; and plating walls of holes and providing electrical conduction with said layers.

REFERENCES:
patent: 3268653 (1966-08-01), McNutt
patent: 3620933 (1971-11-01), Grunwald
patent: 3702284 (1972-11-01), Merkenschlager
patent: 3937857 (1976-02-01), Brunnett
patent: 4023999 (1977-05-01), Lindberg

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