Patent US4680220A successfully refreshed from Google Patents.
US4680220A
Expired / Lapsed
US
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Dielectric materials
Assignee: W.L. Gore and Associates Inc
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Filing: 1985-02-26
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Granted: 1987-07-14
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Expires: 2005-02-26
Abstract
Abstract Dielectric materials having low dielectric constant are provided, the materials comprising fabrics impregnated with thermosetting resins, at least a portion of the fibers in the fabrics being fluorocarbon fibers. Also provided is a method of manufacture of these dielectric materials. The dielectric materials are useful in the fabrication of multilayer printed circuit boards.
Inventors
- 👤 Daniel D. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:24
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/02; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; B32B5/22; B32B5/24; B32B5/28; B32B15/00; B32B15/14; B32B15/20; B32B27/00; B32B27/12; B32B27/28; B32B27/281; B32B27/34; B32B27/38; B32B38/00; B32B38/08; B32B5/022; B32B5/024; B32B5/26; B32B7/00; B32B7/04; B32B7/12; C; C08; C08J; C08J5/00; C08J5/04; H05K1/0313; H05K1/0353; H05K1/036; H05K1/0366; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/023; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/10; B32B2262/101; B32B2307/00; B32B2307/20; B32B2307/204; B32B2315/00; B32B2315/08; B32B2315/085; B32B2363/00; B32B2377/00; B32B2379/00; B32B2379/08; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/015; H05K2201/02; H05K2201/0275; H05K2201/0278; H05K2201/03; H05K2201/032; H05K2201/0323; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31721; Y10T442/00; Y10T442/30; Y10T442/3382; Y10T442/3415; Y10T442/3423
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
74 words
A dielectric material comprising a fabric having fibers and interstices between said fibers, in which at least a portion of the fibers in said fabric are treated fluorocarbon fibers, such treatment making the fluorocarbon fibers wettable by an uncured thermosetting resin, the fabric being impregnated within said interstices between said fibers with a themosetting resin cured to at least the semi-cured, B-stage state, the dielectric constant of said dielectric material being less than 3.5.
Claim 2
Dependent Claim
74 words
A dielectric material comprising a fabric having fibers and interstices between said fibers, in which at least a portion of the fibers in said fabric are treated fluorocarbon fibers, such treatment making the fluorocarbon fibers wettable by an uncured thermosetting resin, the fabric being impregnated within said interstices between said fibers with a themosetting resin cured to at least the semi-cured, B-stage state, the dielectric constant of said dielectric material being less than 3.5.
Claim 3
Dependent Claim
13 words
The dielectric material of claim 1 having a dielectric constant less than 3.0.
Claim 4
Dependent Claim
18 words
The dielectric material of claim 1 in which the thermosetting resin is cured to the fully-cured, C-stage state.
Claim 5
Dependent Claim
18 words
The dielectric material of claim 3 having an electrically conductive foil bonded to at least one surface thereof.
Claim 6
Dependent Claim
21 words
The dielectric material of claim 3 in sheet form having an electrically conductive foil bonded to at least one side thereof.
Claim 7
Dependent Claim
16 words
The dielectric material of claim 5 having an electrically conductive foil bonded to both sides thereof.
Claim 8
Dependent Claim
15 words
The dielectric material of claims 4, 5 or 6 wherein said foil is copper foil.
Claim 9
Dependent Claim
47 words
A laminated composite structure comprising one or more sheets of the dielectric material of claim 1 in which the thermosetting resin is cured to the fully-cured, C-stage state, and having an electrically conductive foil bonded to at least one side of at least one of said sheets.
Claim 10
Dependent Claim
75 words
A laminated composite structure comprising one or more sheets of the dielectric material of claim 1 in which the thermosetting resin is cured to the fully-cured, C-stage state, and one or more sheets of the dielectric material of claim 1 in which the thermosetting resin is cured to the semi-cured, B-stage state, wherein, wherever a layer of material in said C-stage state contacts another layer, said other layer is of material in said B-stage state.
Claim 11
Dependent Claim
101 words
A laminated composite structure comprising one or more sheets of the dielectric material of claim 1 in which the thermosetting resin is cured to the fully-cured, C-stage state, and having an electrically conductive foil bonded to at least one side of at least one of said sheets, and one or more sheets of the dielectric material of claim 1 in which the thermosetting resin is cured to the semi-cured, B-stage state, wherein, wherever a layer of material in said C-stage state, and wherein, wherever an electrically conductive foil contacts another layer, said other layer is of material in said B-stage state.
Claim 12
Dependent Claim
26 words
The composite of claim 9 or 10 wherein said thermosetting resin in the dielectric material is cured to the fully-cured, C-stage state, throughout said laminated composite.
Claim 13
Dependent Claim
30 words
The composite structure of claims 8, 9, 10 or 11, having at least one additional layer of a composite structure including material other than the dielectric material of claim 1.
Claim 14
Dependent Claim
33 words
The composite structure of claim 12 wherein said at least one additional layer is a layer selected from the group consisting of epoxy/fiberglass, fluorocarbon/fiberglass, polyimide/fiberglass, epoxy/polyaramide fiber, epoxy/quartz fiber and polyimide/quartz fiber composites.
Claim 15
Dependent Claim
26 words
The dielectric material of claim 1 wherein said thermosetting resin is selected from the group consisting of epoxy, polyimide, polyamide, polyester, phenolic and acrylic thermosetting resin.
Claim 16
Dependent Claim
14 words
The dielectric material of claim 1 wherein said thermosetting resin is an epoxy resin.
Claim 17
Dependent Claim
15 words
The dielectric material of claim 1 wherein all fibers in said fabric are fluorocarbon fibers.
Claim 18
Dependent Claim
19 words
The dielectric material of claim 1 wherein all fibers in said fabric other than fluorocarbon fibers are fiberglass fibers.
Claim 19
Dependent Claim
20 words
The dielectric material of claim 1 wherein all said fibers in said fabric other than fluorocarbon fibers are polyaramide fibers.
Claim 20
Dependent Claim
20 words
The dielectric material of claim 1 wherein all said fibers in said fabric other than fluorocarbon fibers are quartz fibers.
Claim 21
Dependent Claim
14 words
The dielectric material of claim 1 in which said fabric is a woven fabric.
Claim 22
Dependent Claim
16 words
The dielectric material of claim 1 in which said fabric is a non-woven felt or mat.
Claim 23
Dependent Claim
13 words
The dielectric material of claim 1 wherein said fluorocarbon fibers are PTFE fibers.
Claim 24
Dependent Claim
16 words
The dielectric material of claim 1 wherein said fluorocarbon fibers are drawn, nonporous, sintered PTFE fibers.
Claim 25
Dependent Claim
15 words
The dielectric material of claim 1 wherein said fluorocarbon fibers are expanded, porous PTFE fibers.
Claim 26
Dependent Claim
13 words
The dielectric material of claim 1 wherein said fluorocarbon fibers contain a filler.
Claim 27
Dependent Claim
14 words
The dielectric material of claim 25 wherein said filler is a dielectric insulator material.
Claim 28
Dependent Claim
19 words
The dielectric material of claim 26 wherein said filler is selected from the class consisting of ceramic and glass.
Claim 29
Dependent Claim
14 words
The dielectric material of claim 25 wherein said filler is electrically conductive or semi-conductive.
Claim 30
Dependent Claim
25 words
The dielectric material of claim 28 wherein said filler is selected from the class consisting of electrically conductive or semi-conductive metals, metal oxides or carbon.
Claim 31
Dependent Claim
13 words
The dielectric material of claim 3 used in a printed circuit laminated composite.
Claim 32
Dependent Claim
11 words
The dielectric material of claim 3 used in a dielectric insulator.
Claim 33
Dependent Claim
12 words
The dielectric material of claim 3 used in a submicrowave dielectric insulator.
Claim 34
Dependent Claim
12 words
The dielectric material of claim 3 used in a microwave dielectric insulator.
Claim 35
Dependent Claim
13 words
The dielectric material of claim 3 used in a microwave printed circuit board.
Claim 36
Dependent Claim
11 words
The dielectric material of claim 3 used in a microwave radome.
References Cited (Backward Citations)
US4241132A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-07-13 | 1991-01-12 | 1991-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-13 | 1995-01-12 | 1995-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-13 | 1999-01-12 | 1999-07-14 | $7700.00 | Window Closed / Lapsed |