Patent US4704231A successfully refreshed from Google Patents.
US4704231A
Expired / Lapsed
US
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Low-density graphite-polymer electrical conductors
Assignee: Graftech Inc
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Filing: 1984-05-21
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Granted: 1987-11-03
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Expires: 2004-05-21
Abstract
Abstract This invention relates to composites comprising exfoliated graphite flakes in a polymer matrix which constitutes a small volume fraction; the density of the composite is 0.7 g/cm 3 or below and the electrical resistivity of the composite is 0.5 ohm.cm or below. This invention also relates to composites comprising exfoliated graphite flakes bound by a polymer, such that the flakes are preferentially oriented. In addition, this invention relates to a process for producing these composites.
Inventors
- 👤 Deborah D. L. Chung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:28
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08K7/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
35 words
A composition which comprises exfoliated graphite flakes in a polymer binder wherein the density of the composition does not exceed 0.7 g/cm 3 and the electrical resistivity of the composition does not exceed 0.5 ohm.cm.
Claim 2
Dependent Claim
35 words
A composition which comprises exfoliated graphite flakes in a polymer binder wherein the density of the composition does not exceed 0.7 g/cm 3 and the electrical resistivity of the composition does not exceed 0.5 ohm.cm.
Claim 3
Dependent Claim
29 words
A molding composition which comprises exfoliated graphite flakes in a polymer binder wherein the flakes are oriented in the binder such that their c-axes are in substantially parallel alignment.
Claim 4
Dependent Claim
29 words
A molding composition which comprises exfoliated graphite flakes in a polymer binder wherein the flakes are oriented in the binder such that their c-axes are in substantially parallel alignment.
Claim 5
Dependent Claim
56 words
A process for producing a low density electrically conductive molding composition which comprises the steps of: (a) combining exfoliated graphite flakes, a polyester laminating resin and a hardener to form a suspension; (b) centrifuging the resultant suspension and thereby orienting said flakes with their c-axes in substantially parallel alignment; and (c) allowing the resin to set.
Claim 6
Dependent Claim
56 words
A process for producing a low density electrically conductive molding composition which comprises the steps of: (a) combining exfoliated graphite flakes, a polyester laminating resin and a hardener to form a suspension; (b) centrifuging the resultant suspension and thereby orienting said flakes with their c-axes in substantially parallel alignment; and (c) allowing the resin to set.
Claim 7
Dependent Claim
14 words
The composition of claim 1 wherein the polymer binder is a polyester laminating resin.
Claim 8
Dependent Claim
26 words
The composition of claim 2 wherein the density of the composition does not exceed 0.7 g/cm 3 and the electrical resistivity does not exceed 0.5 ohm/cm.
Claim 9
Dependent Claim
14 words
The composition of claim 2 wherein the polymer binder is a polyester laminating resin.
References Cited (Backward Citations)
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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) | 1990-11-02 | 1991-05-04 | 1991-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-02 | 1995-05-04 | 1995-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-02 | 1999-05-04 | 1999-11-03 | $7700.00 | Window Closed / Lapsed |