Printed wiring board comprising a conductive pattern retreating

Details Printed wiring board comprising a conductive pattern retreating Printed wiring board comprising a conductive pattern retreating

1978-05-15

1979-12-25

Husar, Francis J.

Metal working

Method of mechanical manufacture

Electrical device making

174 685, 156656, 427 97, 204 15, 430314, H05K 306

Patent

active

041798007

ABSTRACT:
In a printed wiring board having an outwardly flaring through-hole, a conductive pattern is formed on the inwardly directed surface of the hole so as to reach a principal surface of the board only at that circumferential portion of the hole where the pattern is continuous to a pattern portion, if any, formed on the principal surface. The pattern is formed in the through-hole by positive use of that portion of a photoresist film formed on the principal surface to cover the hole which partly protrudes into the hole.

REFERENCES:
patent: 3143484 (1964-08-01), Olin et al.
patent: 3185947 (1965-05-01), Freymodsson
patent: 3343256 (1967-09-01), Smith et al.
patent: 3354543 (1967-11-01), Lawrence et al.
patent: 3702284 (1972-11-01), Merkenschlager
patent: 3873429 (1975-03-01), Brown

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