Patent · US Expired

Flexible circuits

US4847139A · kind A · utility

45Cited by

5References

19Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gerhard D. Wolf · Dormagen, DE
Kirkor Sirinyan · Bensberg, DE
Ulrich von Gizycki · Leverkusen, DE
Rudolf Merten · Leverkusen, DE

Key dates

Filing date	Aug 25, 1987
Grant date	Jul 11, 1989
Priority date	—
Expiry date	Aug 25, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Flexible circuits are obtained in an elegant manner, without the customary etching methods, wet-chemically in accordance with the principles of semiadditive or fully additive technology by using for the activation noble metal activators and, as base material, films or flexible boards whose surface has (a) a specific total pore volume per unit area of 0.015-0.045 dm.sup.3/ m.sup.2, (b) an average pore diameter of 0.05-5.0 .mu.m and (c) an average pore depth of 0.05-4.0 .mu.m.

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