Patent · US Expired

Method for producing printed circuits

US4285991A · kind A · utility

13Cited by

3References

17Claims

0Family size

Assignee

SCHERING CORPORATION · US

Inventors

Klaus Gedrat · Berlin, DE
Hans-Jurgen Ehrich · Berlin, DE
Hartmut Mahlkow · Berlin, DE
Joachim Wolff · Odenthal, DE

Key dates

Filing date	May 15, 1980
Grant date	Aug 25, 1981
Priority date	—
Expiry date	May 15, 2000

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49165
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A method for producing printed circuits. An epoxy resin reinforced with glass fiber is used as basis material, coated with copper, drilled and activated. In one embodiment, the circuit diagram is applied after covering the non-desired regions with a resistance, by screen or photo printing. A nickel, cobalt, or nickel-cobalt layer is deposited onto the circuit, the circuit is covered with a solder prevention lacquer, then the eyes and bore holes are covered with copper. Alternatively, after pre-treatment and activation, all areas except the soldering eyes and bore holes are covered with resist, a nickel, cobalt or nickel-cobalt layer is applied, the circuit diagram is printed using a resist, and the eyes and bore hole are treated as above.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.