US3923697A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically conductive compositions and their use
Assignee: TVI ENERGY CORP
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Filing: 1974-02-01
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Granted: 1975-12-02
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Expires: 1994-02-01
Abstract
Abstract An electrically conductive composition comprises a particulate, homogeneous blend of: A. about 60% to about 98% by weight of graphite; B. about 1.5% to about 20% by weight of manganese dioxide; and C. about 0.5% to about 20% by weight of zinc oxide, based on total weight of said blend. These compositions are suitable for the manufacture of coating compositions, heating elements and structures which are useful where radiant, conductive, or convective heating is required, and for other applications which utilize the sheet and volumetric electrical conductivity properties of the formulations made therefrom.
Inventors
- 👤 Harold Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:30
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14; H05B3/145; H01; H01B; H01B1/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
55 words
AN ELECTRICALLY CONDUCTIVE COMPOSITION COMPRISING A PARTICULATE, HOMOGENEOUS BLEND OF: A. ABOUT 60 TO ABOUT 98% BY WEIGHT OF GRAPHITE, B. ABOUT 1.5 TO ABOUT 20% BY WEIGHT OF MANGANESE DIOXIDE, AND C. ABOUT 0.5 TO ABOUT 20% BY WEIGHT OF ZINC OXIDE, EACH OF SAID PERCENTAGES BASED ON THE TOTAL WEIGHT OF SAID BLEND.
Claim 2
Dependent Claim
55 words
AN ELECTRICALLY CONDUCTIVE COMPOSITION COMPRISING A PARTICULATE, HOMOGENEOUS BLEND OF: A. ABOUT 60 TO ABOUT 98% BY WEIGHT OF GRAPHITE, B. ABOUT 1.5 TO ABOUT 20% BY WEIGHT OF MANGANESE DIOXIDE, AND C. ABOUT 0.5 TO ABOUT 20% BY WEIGHT OF ZINC OXIDE, EACH OF SAID PERCENTAGES BASED ON THE TOTAL WEIGHT OF SAID BLEND.
Claim 3
Dependent Claim
25 words
an electrically conductive composition according to claim 1 wherein the amount of (A) is about 92.6%, (B) about 6.2% and (C) about 1.2% by weight.
Claim 4
Dependent Claim
26 words
An electrically conductive composition according to claim 1 wherein (A) consists of crystallites having a particle size of from about 250 microns to about 1 micron.
Claim 5
Dependent Claim
26 words
An electrically conductive composition according to claim 2 wherein (A) consists of crystallites having a particle size of from about 75 microns to about 2 microns.
Claim 6
Dependent Claim
35 words
An electrically conductive composition according to claim 1 wherein (A) consists of about 69.4% ccrystallites having a particle size of about 75 microns and about 23.2% crystallites having a particle size of about 2 microns.
Claim 7
Dependent Claim
26 words
An electrically conductive composition according to claim 2 wherein about 0.05 to about 5% by weight AgCl, based on total weight of particulate material, is added.
Claim 8
Dependent Claim
26 words
An electrically conductive composition according to claim 2 wherein about 0.05 to about 5% by weight SnCl4, based on total weight of particulate material, is added.
Claim 9
Dependent Claim
26 words
A coating composition comprising the electrically conductive composition of claim 1 uniformly dispersed in an organic or inorganic vehicle which does not dissolve said particulate material.
Claim 10
Dependent Claim
24 words
A coating composition according To claim 8 in which the vehicle is comprised of a binder or binder and a solvent for the binder.
Claim 11
Dependent Claim
71 words
A coating compostion according to claim 9 wherein the binder is a member selected from the group consisting of: acrylics, alkyds, cellulosics, epoxies, fluoroplastics, ionomers, nylons, phenolics, polymades, polyimides, polybutadienes, polyesters, polypropylenes, polyurethanes, silicones, natural resins and rubbers, stryrene-butadienes, nitrile rubbers, polysulfied rubbers, polyvinyl acetate, polyvinyl alcohols, silicates, polysilicates, hydraulic-setting Portland cements, sodium aluminates, gypsum, glass and glass frit compositions; ceramic and refractory compositions; and minerals including bentonites and mixtures thereof.
Claim 12
Dependent Claim
16 words
A coating composition comprising the electrically conductive composition of claim 1 and a solid, particulate binder.
Claim 13
Dependent Claim
39 words
A coating composition comprising the electrically conductive componsition of claim 1 uniformly dispersed in a vehicle comprising a binder capable of forming a film, wherein said vehicle does not dissolve said particulate material, said binder being a silicone resin.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |