US4997702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shape retaining flexible electrical circuit
Assignee: Rogers Corp
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Filing: 1990-02-06
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Granted: 1991-03-05
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Expires: 2010-02-06
Abstract
Abstract A printed circuit board composed of an epoxy impregnated nonwoven web substrate laminated to electrically conductive sheets is presented. The printed circuit board is flexible in the sense that it can be bent to any desired multiplanar shape and will retain that shape after installation as required by electronic interconnection systems. The printed circuit board also has improved thermal properties achieved through the addition of up to 70% by weight of low coefficient of thermal expansion (CTE) particulate fillers and/or the use of thermally stable reinforcement fibers in the non-woven web.
Inventors
- 👤 Samuel Gazit
- 👤 Gary W. Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/20; B32B27/06; B32B27/08; B32B5/00; B32B5/02; B32B5/022; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353; H05K1/0366; H05K1/0373; H05K1/0393; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0261; B32B2262/0269; B32B2262/0276; B32B2262/10; B32B2262/101; B32B2315/00; B32B2315/08; B32B2315/085; B32B2363/00; B32B2457/00; B32B2457/08; H05K2201/00; H05K2201/01; H05K2201/0137; H05K2201/015; H05K2201/02; H05K2201/0203; H05K2201/0206; H05K2201/0209; H05K2201/0239; H05K2201/0242; H05K2201/0251; H05K2201/0254; H05K2201/0275; H05K2201/0278; H05K2201/0293; H05K2201/05; H05K2201/057; H05K2201/06; H05K2201/068; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2713
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
138 words
A circuit material composite comprising: (a) a substrate including; a nonwoven web fabric; an epoxy resin impregnating said nonwoven web fabric, said epoxy resin having a glass transition in the range of about 10-60° C., said glass transition having a breadth of about 20 to 30° C.; filler material in said nonwoven web fabric and epoxy resin, said filler material comprising 20-70% by weight of the total composite and being comprised of inorganic filler-material or fibers wherein the coefficient of thermal expansion in the Z direction for the circuit material composite is in the range of 100-300 ppm/°C.; and (b) a layer of conductive material on at least a portion of a surface of said substrate, said composite being flexible in the sense that it can be bent to a desired multiplanar shape and will retain that shape.
Claim 2
Dependent Claim
138 words
A circuit material composite comprising: (a) a substrate including; a nonwoven web fabric; an epoxy resin impregnating said nonwoven web fabric, said epoxy resin having a glass transition in the range of about 10-60° C., said glass transition having a breadth of about 20 to 30° C.; filler material in said nonwoven web fabric and epoxy resin, said filler material comprising 20-70% by weight of the total composite and being comprised of inorganic filler-material or fibers wherein the coefficient of thermal expansion in the Z direction for the circuit material composite is in the range of 100-300 ppm/°C.; and (b) a layer of conductive material on at least a portion of a surface of said substrate, said composite being flexible in the sense that it can be bent to a desired multiplanar shape and will retain that shape.
Claim 3
Dependent Claim
16 words
The composite of claim 1 including: at least one silane coupling agent on said filler material.
Claim 4
Dependent Claim
19 words
The composite of claim 1 wherein: said nonwoven web fabric comprises a blend of glass fibers and polymeric fibers.
Claim 5
Dependent Claim
16 words
The composite of claim 3 wherein: said polymeric fibers have thermal stability above about 260° C.
Claim 6
Dependent Claim
34 words
The composite of claim 3 wherein: said polymeric fibers comprise at least one fiber selected from the group consisting of aromatic polyamide, phenolic, poly (acrylonitrile), copolymers of acrylonitrile, polyester, poly (phenylene sulfide) and fluoropolymer.
Claim 7
Dependent Claim
20 words
The composite of claim 1 wherein: said filler material is selected from the group consisting of clays or mineral fillers.
Claim 8
Dependent Claim
30 words
The composite of claim 1 wherein: said filler material is selected from the group consisting of wollastonite, diatomaceous earth, mica beta-eucryptite, silica, glass microspheres, ground glass microfiber or calcium sulfate.
Claim 9
Dependent Claim
28 words
The composite of claim 1 wherein said epoxy resin comprises: a multifunctional or difunctional epoxy; a monofunctional or aliphatic difunctional flexible epoxy; and an anhydride, polyanhydride or diacid.
Claim 10
Dependent Claim
18 words
The composite of claim 1 wherein: said filler material comprises 40-50% by weight of the total composite material.
Claim 11
Dependent Claim
17 words
The composite of claim 1 including: a synergistic combination of antimony and brominated compounds for flame retardance.
References Cited (Backward Citations)
US4883708A
Cited
US4913955A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |