US4606955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductive pyrolyzed dielectrics and articles made therefrom
Assignee: EIDP Inc
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Filing: 1985-06-18
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Granted: 1986-08-19
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Expires: 2005-06-18
Abstract
Abstract A conductive dielectric structure is disclosed wherein a thermoplastic matrix has a multitude of electrically conductive channels through its thickness and, optionally, at least one electrically conductive surface which, along with protective and heat seal layers, can be formed into conductive belts.
Inventors
- 👤 Paul F. Eastman
- 👤 Susan W. Enouen
- 👤 William E. Hawkins
- 👤 Darrell J. Parish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:46
CPC Classifications
B; B32; B32B; B32B3/00; B32B3/10; B32B3/12; H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1605; G03G15/162; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1372; Y10T428/24; Y10T428/24149; Y10T428/24628; Y10T428/24661; Y10T428/30; Y10T428/31504; Y10T428/3154; Y10T428/31721
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
81 words
A dielectric thermoplastic shaped article comprising: (a) a pyrolyzable thermoplastic matrix material having a volume electrical conductivity less than 10 -12 mho/cm; and (b) a multitude of electrically conductive paths in the form of channels with walls of carbon from one matrix surface to the other matrix surface throughout the thermoplastic matrix, whereby the channels are 20-130 micrometers in diameter at the surface of the article and the apparent volume electrical conductivity through the article is more than 10 -5 mho/cm.
Claim 2
Dependent Claim
81 words
A dielectric thermoplastic shaped article comprising: (a) a pyrolyzable thermoplastic matrix material having a volume electrical conductivity less than 10 -12 mho/cm; and (b) a multitude of electrically conductive paths in the form of channels with walls of carbon from one matrix surface to the other matrix surface throughout the thermoplastic matrix, whereby the channels are 20-130 micrometers in diameter at the surface of the article and the apparent volume electrical conductivity through the article is more than 10 -5 mho/cm.
Claim 3
Dependent Claim
12 words
The shaped article of claim 1 wherein the thermoplastic matrix is polyimide.
Claim 4
Dependent Claim
34 words
The shaped article of claim 1 wherein the thermoplastic matrix includes, homogeneously distributed throughout, from 5 to 20 weight percent electrically conductive finely-divided particulate additive having a greater electrical conductivity than the thermoplastic matrix.
Claim 5
Dependent Claim
14 words
The shaped article of claim 1 in the form of a film of material.
Claim 6
Dependent Claim
51 words
The film of claim 4 wherein at least one surface of the film has a fluoropolymer coating and, further, wherein the fluoropolymer coating has, homogeneously distributed throughout, an amount of electrically conductive finely-divided particulate additive sufficient that the fluoropolymer coating has a greater electrical conductivity than the film without the coating.
Claim 7
Dependent Claim
20 words
The film of claim 4 wherein at least one surface of the film includes an electrically conductive coating of carbon.
Claim 8
Dependent Claim
21 words
The film of claim 5 wherein at least one surface of the fluoropolymer coating includes an electrically conductive coating of carbon.
Claim 9
Dependent Claim
27 words
The film of claim 6 wherein the electrically conductive coating includes graphite and mica and exhibits a surface conductivity of from 10 -2 to 10 -17 mho/square.
Claim 10
Dependent Claim
27 words
The film of claim 7 wherein the electrically conductive coating includes graphite and mica and exhibits a surface conductivity of from 10 -2 to 10 -17 mho/square.
Claim 11
Dependent Claim
114 words
An endless belt comprising a base loop having at least one layer of a film of thermoplastic comprising: (a) a pyrolyzable thermoplastic matrix material having a volume electrical conductivity less than 10 -12 mho/cm; and (b) a multitude of electrically conductive paths randomly located throughout the matrix wherein the paths comprise channels with walls of carbon from one matrix surface to the other matrix surface and wherein the channels are 20-130 micrometers in diameter at the surface of the article and the apparent volume electrical conductivity through the base loop is more than 10 -5 mho/cm; and an outer sleeve of dielectric thermoplastic film with a volume electrical conductivity less than 10 -12 mho/cm.
Claim 12
Dependent Claim
114 words
An endless belt comprising a base loop having at least one layer of a film of thermoplastic comprising: (a) a pyrolyzable thermoplastic matrix material having a volume electrical conductivity less than 10 -12 mho/cm; and (b) a multitude of electrically conductive paths randomly located throughout the matrix wherein the paths comprise channels with walls of carbon from one matrix surface to the other matrix surface and wherein the channels are 20-130 micrometers in diameter at the surface of the article and the apparent volume electrical conductivity through the base loop is more than 10 -5 mho/cm; and an outer sleeve of dielectric thermoplastic film with a volume electrical conductivity less than 10 -12 mho/cm.
Claim 13
Dependent Claim
53 words
The endless belt of claim 10 wherein the film of the base loop has a fluoropolymer coating and the fluoropolymer coating has, homogeneously dispersed throughout, an amount of electrically conductive finely-divided particulate additive sufficient that the fluoropolymer coating has a greater electrical conductivity than the film of the base loop without the coating.
Claim 14
Dependent Claim
22 words
The endless belt of claim 11 wherein at least one surface of the fluorocarbon coating includes an electrically conductive coating of carbon.
Claim 15
Dependent Claim
28 words
The endless belt of claim 12 wherein the electrically conductive coating includes graphite and mica and exhibits a surface conductivity of from 10 -2 to 10 -17 mho/square.
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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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |