Patent US4695404A successfully refreshed from Google Patents.
US4695404A
Expired / Lapsed
US
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Hyperconductive filled polymers
Assignee: Amerasia International Technology Inc
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Filing: 1986-04-07
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Granted: 1987-09-22
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Expires: 2006-04-07
Abstract
Abstract This invention is directed to a polymeric composition comprising a polymeric binder and silver particles and having a volume electrical resistivity of 0.0001 ohm-cm or less.
Inventors
- 👤 Chung T. Kwong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:47
CPC Classifications
H; H01; H01R; H01R4/00; H01R4/04; H01B; H01B1/00; H01B1/20; H01B1/22; H02; H02G; H02G15/00; H02G15/08; H02G15/10; H02G15/103; H02G15/105; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; H05K1/095; H05K3/00; H05K3/30; H05K3/32; H05K3/321; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
A polymeric composition in the form of paste, liquid, or preformed film, comprising a polymeric binder and silver particles evenly distributed in said binder, said binder being prepared from a processable liquid polymer, said silver particles comprising at least 95% pure silver and having a volume electrical resistivity in the compressed free flow state of not more than 0.0002 ohm-cm, said composition having a stable volume electrical resistivity of 0.0001 ohm-cm or less.
Claim 2
Dependent Claim
73 words
A polymeric composition in the form of paste, liquid, or preformed film, comprising a polymeric binder and silver particles evenly distributed in said binder, said binder being prepared from a processable liquid polymer, said silver particles comprising at least 95% pure silver and having a volume electrical resistivity in the compressed free flow state of not more than 0.0002 ohm-cm, said composition having a stable volume electrical resistivity of 0.0001 ohm-cm or less.
Claim 3
Dependent Claim
48 words
A composition of claim 1 wherein said polymeric binder comprises an epoxide resin cured with suitable curing agents and silver flakes at weight fraction loading of from about 70 to 90% by weight, which for this particular flake structure is at least 5% beyond its electrical percolation threshold.
Claim 4
Dependent Claim
32 words
The composition of claim 1 wherein the material of said polymeric binder is selected from the group consisting of epoxies, acrylic resins, silicones, fluorosilicones, polyurethanes, oils of long-chain hydrocarbons, aromatics, or flurocarbons,
Claim 5
Dependent Claim
13 words
The composition of claim 1 which is an adhesive, sealant, coating, or gasket.
Claim 6
Dependent Claim
19 words
The composition of claim 1 wherein said composition comprises part of a B-stage preform, cured structure, or circuit board.
Claim 7
Dependent Claim
72 words
An electrically conductive polymeric composition having a stable volume electrical resistivity in the cured state of not more than 0.0001 ohm-cm, said composition comprising a polymeric binder filled with a conductively effective amount of fine silver particles, said silver particles in a compressed free-flow state having a volume electrical resistivity of not more than 0.0002 ohm-cm, and being evenly distributed in said binder, said binder being formed of a processable liquid polymer.
Claim 8
Dependent Claim
72 words
An electrically conductive polymeric composition having a stable volume electrical resistivity in the cured state of not more than 0.0001 ohm-cm, said composition comprising a polymeric binder filled with a conductively effective amount of fine silver particles, said silver particles in a compressed free-flow state having a volume electrical resistivity of not more than 0.0002 ohm-cm, and being evenly distributed in said binder, said binder being formed of a processable liquid polymer.
References Cited (Backward Citations)
US4210704A
Cited
US4410457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |