US4031313A
Expired / Lapsed
US
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Printed circuits with arc-retardance
Assignee: Dynamit Nobel AG
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Filing: 1975-02-03
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Granted: 1977-06-21
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Expires: 1995-02-03
Abstract
Abstract A laminated material comprises a substrate material containing resin-impregnated layers, a metal foil disposed on said substrate and an arc-retardant layer arranged between the metal foil and the substrate material. The arc-retardant layer is an arc-retardant, crosslinked heat-stable synthetic resinous material consisting of from about 60 to 100% by weight of a heat-stable resin which is free of aromatic groupings or heterocyclic rings containing at least one heteroatom and conjugated double bonds and which is not converted to a graphite-containing structure upon being thermally decomposed.
Inventors
- 👤 Arnold Franz
- 👤 Dirk Huthwelker
- 👤 Lothar Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:07
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/12; H; H01; H01B; H01B5/00; H01B5/14; B32B38/00; B32B38/08; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0326; H05K1/0346; H05K1/0353; H05K1/036; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2317/00; B32B2317/12; B32B2317/125; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/01; H05K2201/0104; H05K2201/012; H05K2201/0133; H05K2201/0137; H05K2201/0145; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31518; Y10T428/31522; Y10T428/31529; Y10T428/31551; Y10T428/31627; Y10T428/31645; Y10T428/31649; Y10T428/31678; Y10T428/31688; Y10T428/31692; Y10T428/31699; Y10T428/31855; Y10T428/31935; Y10T428/31942; Y10T428/31949; Y10T428/31964; Y10T428/31967
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A laminated material comprising a substrate material containing resin-impregnated layers, and an electrically conductive metal foil having a thickness between 5 and 100μ disposed on said substrate and an arc-retardant layer having a high insulation resistance of more than 10 12 ohms arranged between the metal foil and the substrate material, said layer having a thickness of from 20 to 300μ and consisting essentially of from about 60 to about 100% by weight of a heat-stable cross-linked acrylic resin or ketone resin which is free of aromatic groupings or heterocyclic rings containing at least one hetero-atom and conjugated double bonds and which is not converted to a graphite-containing structure upon being thermally decomposed and up to 30% by weight of an epoxy resin, a phenolic resin or a melamine resin.
Claim 2
Dependent Claim
130 words
A laminated material comprising a substrate material containing resin-impregnated layers, and an electrically conductive metal foil having a thickness between 5 and 100μ disposed on said substrate and an arc-retardant layer having a high insulation resistance of more than 10 12 ohms arranged between the metal foil and the substrate material, said layer having a thickness of from 20 to 300μ and consisting essentially of from about 60 to about 100% by weight of a heat-stable cross-linked acrylic resin or ketone resin which is free of aromatic groupings or heterocyclic rings containing at least one hetero-atom and conjugated double bonds and which is not converted to a graphite-containing structure upon being thermally decomposed and up to 30% by weight of an epoxy resin, a phenolic resin or a melamine resin.
Claim 3
Dependent Claim
19 words
The laminated material of claim 1, wherein the said metal foil is made of aluminum, silver, tin or copper.
Claim 4
Dependent Claim
46 words
The laminated material of claim 1, wherein said layer contains acrylonitrile in amounts of 20-70% by weight, acrylic acid ester in amounts between 20-70% by weight, and a phenol-resol resin or an epoxy resin on the basis of bisphenol A in amounts of 15-20% by weight.
Claim 5
Dependent Claim
22 words
The laminated material of claim 3, wherein the acrylic acid ester is the methyl ester or the ethyl ester of acrylic acid.
Claim 6
Dependent Claim
44 words
The laminated material of claim 1 wherein said layer contains the ketone resin in amounts of between 70 and 90% by weight and epoxy resin on the basis of bisphenol A and/or phenol-resol resin in an amount of between 10 and 20% by weight.
Claim 7
Dependent Claim
14 words
The laminated material of claim 1, wherein the metal foil is made of copper.
Claim 8
Dependent Claim
35 words
The laminated material of claim 1, wherein said acrylic resin is a polyacrylonitrile, polymethacrylonitrile, or a polyalkylacrylate and the ketone resin is a resin produced by alkaline condensation of aliphatic and/or cycloaliphatic ketones with formaldehyde.
Claim 9
Dependent Claim
20 words
A printed circuit which comprises the laminated material of claim 1, wherein the foil is printed to form a conductor.
Claim 10
Dependent Claim
32 words
The laminated material of claim 1, wherein the arc-retardant layer is absorbed in a reinforcing material of the uppermost laminate layer of the substrate material and in contact with the metal foil.
References Cited (Backward Citations)
US2721153A
Cited
US3090706A
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US3240662A
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US3770572A
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US3477900A
Cited
US3558423A
Cited
US3892903A
Cited
US3809603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |