US3886022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for peeling off an aluminum foil
Assignee: Perstorp AB
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Filing: 1974-05-24
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Granted: 1975-05-27
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Expires: 1994-05-24
Abstract
Abstract Process for peeling off an aluminum foil from a copper layer of a copper-clad, insulating base, which base is intended for the production of printed circuits. The process is characterized in that the peeling off is carried out below the surface of an aqueous solution or at a continuous supply of an aqueous solution on the boundary between the copper layer and the aluminum foil.
Inventors
- 👤 Jiri K Konicek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:40
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/02; H05K3/022; H05K3/025; H05K2203/00; H05K2203/01; H05K2203/0147; H05K2203/0152; H05K2203/07; H05K2203/0779; H05K2203/0786; Y; Y10; Y10S; Y10S156/00; Y10S156/918; Y10S156/919; Y10S156/922; Y10T; Y10T156/00; Y10T156/11
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
PROCESS FOR PEELING OFF AN ALUMINUM FOIL FROM A COPPER LAYER OF A COPPER-CLAD, INSULATING BASE INTENDED FOR THE PRODUCTION OF PRINTED CIRCUITS, CHARACTERIZED IN THAT THE PEELING OFF IS CARRIED OUT BELOW THE SURFACE OF AN AQUEOUS SOLUTION OR AT A CONTINUOUS SUPLY OF AN AQUEOUS SOLUTION ON THE BOUNDARY BETWEEN THE COPPER LAYER AND !HE ALUMINUM FOIL.
Claim 2
Dependent Claim
59 words
PROCESS FOR PEELING OFF AN ALUMINUM FOIL FROM A COPPER LAYER OF A COPPER-CLAD, INSULATING BASE INTENDED FOR THE PRODUCTION OF PRINTED CIRCUITS, CHARACTERIZED IN THAT THE PEELING OFF IS CARRIED OUT BELOW THE SURFACE OF AN AQUEOUS SOLUTION OR AT A CONTINUOUS SUPLY OF AN AQUEOUS SOLUTION ON THE BOUNDARY BETWEEN THE COPPER LAYER AND !HE ALUMINUM FOIL.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |