US3981691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal-clad dielectric sheeting having an improved bond between the metal and dielectric layers
Assignee: 3M Co
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Filing: 1974-07-01
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Granted: 1976-09-21
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Expires: 1994-07-01
Abstract
Abstract An improved bond between the metal and dielectric layers of metal-clad dielectric sheeting is obtained by use of a black-chromium treatment on the metal layer.
Inventors
- 👤 Edward A. Cuneo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:07
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B32B15/20; B32B27/00; B32B27/28; B32B27/281; H; H05; H05K; H05K3/00; H05K3/38; H05K3/382; H05K3/384; B32B2307/00; B32B2307/20; B32B2307/202; B32B2307/206; B32B2457/00; B32B2457/08; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/032; H05K1/0346; H05K1/0393; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/0154; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0355; H05K2203/00; H05K2203/07; H05K2203/0703; H05K2203/0723; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/80; Y10S505/812; Y10S505/825; Y10S505/856; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12556; Y10T428/12569; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/12847; Y10T428/12861; Y10T428/12903; Y10T428/12986; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31529; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
Multilayered sheeting useful as a component of flexible electric circuitry, comprising a layer of electrically conductive metal, a thin black-chromium layer on at least one side of the layer of conductive metal, and a layer of electrically insulating polymeric material bonded to said black-chromium layer, whereby after etching of the layer conductive metal to provide narrow-width conductors, the conductors will not be delaminated from the layer of electrically insulating polymeric material by exposure of the sheeting for 5 minutes in a 10-normal hydrochloric acid bath at 25°C.
Claim 2
Dependent Claim
87 words
Multilayered sheeting useful as a component of flexible electric circuitry, comprising a layer of electrically conductive metal, a thin black-chromium layer on at least one side of the layer of conductive metal, and a layer of electrically insulating polymeric material bonded to said black-chromium layer, whereby after etching of the layer conductive metal to provide narrow-width conductors, the conductors will not be delaminated from the layer of electrically insulating polymeric material by exposure of the sheeting for 5 minutes in a 10-normal hydrochloric acid bath at 25°C.
Claim 3
Dependent Claim
14 words
Multilayered sheeting of claim 1 in which the layer of conductive metal comprises copper.
Claim 4
Dependent Claim
17 words
Multilayered sheeting of claim 1 in which the layer of electrically insulating polymeric material comprises a polyimide.
Claim 5
Dependent Claim
34 words
Multilayered sheeting of claim 1 in which said layer of electrically insulating polymeric material is an adhesive layer disposed between an additional layer of electrically insulating polymeric material and said layer of conductive metal.
Claim 6
Dependent Claim
15 words
Multilayered sheeting of claim 4 in which said adhesive layer comprises an epoxy-terminated reactive compound.
Claim 7
Dependent Claim
18 words
Multilayered sheeting of claim 1 in which the layer of conductive metal is configured as an electrical circuit.
Claim 8
Dependent Claim
18 words
Multilayered sheeting of claim 6 in which electrical components are electrically connected to the layer of conductive metal.
Claim 9
Dependent Claim
82 words
Multilayered sheeting useful as a component of electric circuitry comprising a layer of copper-based electrically conductive metal, a thin black-chromium layer on at least one side of the layer of conductive metal, and a layer of polyimide electrically insulating polymeric material bonded to said black-chromium layer, whereby after etching of the layer of conductive metal to provide narrow-width conductors, the conductors will not be delaminated from the polyimide layer by exposure for 5 minutes in a 10-normal hydrochloric acid bath at 25°C.
Claim 10
Dependent Claim
82 words
Multilayered sheeting useful as a component of electric circuitry comprising a layer of copper-based electrically conductive metal, a thin black-chromium layer on at least one side of the layer of conductive metal, and a layer of polyimide electrically insulating polymeric material bonded to said black-chromium layer, whereby after etching of the layer of conductive metal to provide narrow-width conductors, the conductors will not be delaminated from the polyimide layer by exposure for 5 minutes in a 10-normal hydrochloric acid bath at 25°C.
Claim 11
Dependent Claim
18 words
Multilayered sheeting of claim 8 in which the layer of conductive metal is configured as an electrical circuit.
Claim 12
Dependent Claim
18 words
Multilayered sheeting of claim 9 in which electrical components are electrically connected to the layer of conductive metal.
Claim 13
Dependent Claim
15 words
Multilayered sheeting of claim 9 in which the layer of conductive metal comprises rolled copper.
Claim 14
Dependent Claim
84 words
Multilayered sheeting useful as a component of flexible electrical circuitry comprising a rolled copper foil, a thin black-chromium layer deposited on at least one largearea surface of the foil, and a layer of electrically insulating polymeric material bonded to said black-chromium layer, whereby after etching of the layer of conductive metal to provide narrow-width conductors, the conductors will not be delaminated from the layer of electrically insulating polymeric material by exposure of the sheeting for five minutes in 10-normal hydrochloric acid bath at 25°C.
Claim 15
Dependent Claim
84 words
Multilayered sheeting useful as a component of flexible electrical circuitry comprising a rolled copper foil, a thin black-chromium layer deposited on at least one largearea surface of the foil, and a layer of electrically insulating polymeric material bonded to said black-chromium layer, whereby after etching of the layer of conductive metal to provide narrow-width conductors, the conductors will not be delaminated from the layer of electrically insulating polymeric material by exposure of the sheeting for five minutes in 10-normal hydrochloric acid bath at 25°C.
Claim 16
Dependent Claim
13 words
Multilayered sheeting of claim 12 in which said polymeric material comprises a polyimide.
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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) | 1979-09-21 | 1980-03-22 | 1980-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-21 | 1984-03-22 | 1984-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-21 | 1988-03-22 | 1988-09-21 | $7700.00 | Window Closed / Lapsed |