US3948701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing base material for printed circuits
Assignee: AEG Isolier und Kunststoff GmbH
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Filing: 1974-10-02
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Granted: 1976-04-06
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Expires: 1994-10-02
Abstract
Abstract In a process for making a printed circuit, a method of forming a base for the circuit, including coating a cover foil with a decomposable film, then bonding the film to a carrier, and then removing the cover foil from the film. A protected base useful for making printed circuits, comprising a synthetic-resin-based carrier, a decomposable adhesive film bonded to the carrier, and a removable cover foil bonded to the film, the adhesive film containing catalyst effective for the electroless deposition of metal conductors.
Inventors
- 👤 Helmut Fasbender
- 👤 Horst Hirschfeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:03
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/002; H05; H05K; H05K3/00; H05K3/10; H05K3/18; H05K3/181; H05K3/182; H05K3/184; H05K3/38; H05K3/386; H05K3/387; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/0133; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0236; H05K2201/20; H05K2201/2081; H05K2203/00; H05K2203/06; H05K2203/066; H05K2203/11; H05K2203/1152; H05K2203/13; H05K2203/1377; H05K2203/1388; H05K3/0011; H05K3/0044; H05K3/0047; H05K3/40; H05K3/42; H05K3/425; H05K3/426; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31688; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
In the manufacture of base material for printed circuits comprising a resin impregnated carrier material and a chemically decomposable heat-hardenable resinous adhesive film on a surface of said carrier, the improvement comprising coating an aluminum foil with an adhesive film of an acrylonitrile-butadiene copolymer in combination with a phenolic resin as said decomposable heat-hardenable resinous adhesive film, placing the film side of the thus-coated foil on a surface of the resin impregnated carrier material, bonding said film to said carrier material by applying heat and pressure thereto to form a pressed base material having a foil which can be etched away to expose an adhesive surface which is substantially free of impurities and etching away metal foil from the film before a circuit is formed on said base material.
Claim 2
Dependent Claim
129 words
In the manufacture of base material for printed circuits comprising a resin impregnated carrier material and a chemically decomposable heat-hardenable resinous adhesive film on a surface of said carrier, the improvement comprising coating an aluminum foil with an adhesive film of an acrylonitrile-butadiene copolymer in combination with a phenolic resin as said decomposable heat-hardenable resinous adhesive film, placing the film side of the thus-coated foil on a surface of the resin impregnated carrier material, bonding said film to said carrier material by applying heat and pressure thereto to form a pressed base material having a foil which can be etched away to expose an adhesive surface which is substantially free of impurities and etching away metal foil from the film before a circuit is formed on said base material.
Claim 3
Dependent Claim
34 words
In a process for making a printed circuit, a method as claimed in claim 1, further comprising the step of decomposing at least some of said film immediately after the step of etching away.
Claim 4
Dependent Claim
26 words
The improvement as claimed in claim 1 further comprising drilling a hole through the metal foil, film and base material before the step of etching away.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |