METHOD FOR PRE-TREATMENT OF CONICAL HOLES IN MULTILAYER PRINTED-CIRCUIT BOARDS BEFORE METAL SPUTTERING Russian patent published in 2002 - IPC

Abstract RU 2182409 C1

FIELD: manufacture of multilayer printed-circuit boards. SUBSTANCE: prior to metal sputtering in through conical holes insulating layers on their butt ends are chipped away and protruding ends of contact pads are bent out towards central layers and uniformly distributed over hole surfaces whereupon internal walls of these holes are coated with current-conducting material. EFFECT: facilitated procedure, simplified design of equipment used. 3 dwg

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RU 2 182 409 C1

Authors

Sukholitko V.A.

Dates

2002-05-10Published

2001-02-14Filed