US4440823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed board for electrical circuits
Assignee: Wilhelm Ruf KG
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Filing: 1982-06-08
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Granted: 1984-04-03
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Expires: 2002-06-08
Abstract
Abstract A process for producing printed boards for electrical circuits in the case of which copper-coated board material is printed with an etch resist or etch resistant lacquer is representative of printed wiring to be produced, and after the curing of the etch resist, the copper layer is etched away at positions where it is not resist-covered. The etch resist is electrically conducting. In a further development of the invention non-conducting etch resist is used for making crossovers of the printed wiring of a multi-layer printed board.
Inventors
- 👤 Horst Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:39
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/06; H05K3/061; H05K3/22; H05K3/28; H05K3/46; H05K3/4685; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/035; H05K2203/00; H05K2203/05; H05K2203/0562; H05K2203/0571; H05K3/24; H05K3/245; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/12; Y10T428/12389; Y10T428/12396; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
A printed circuit board for an electrical circuit, said printed circuit board comprising: (a) an insulating board; (b) a copper layer on said insulating board; and (c) an etch resistant, electrically conducting lacquer layer covering said copper layer is protected from oxidation by said electrically conducting lacquer layer and its conductivity is enhanced.
Claim 2
Dependent Claim
53 words
A printed circuit board for an electrical circuit, said printed circuit board comprising: (a) an insulating board; (b) a copper layer on said insulating board; and (c) an etch resistant, electrically conducting lacquer layer covering said copper layer is protected from oxidation by said electrically conducting lacquer layer and its conductivity is enhanced.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |