US4825049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon film coated refractory fiber cloth
Assignee: Northrop Grumman Corp
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Filing: 1987-03-19
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Granted: 1989-04-25
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Expires: 2007-03-19
Abstract
Abstract A flexible electrically conducting cloth comprising a plurality of intermingled or interwoven fibers of a refractory material having a sheet resistance above 1000 ohms per square. A conducting coating having at least about 70 atomic percent carbon encapsulates a majority of the fibers. The coating is applied in sufficient quantity to render the cloth electrically conducting with a sheet resistance of about 0.1 to about 1000 ohms per square, the coating having been formed by chemical vapor deposition at 800° C. to 1200° C. A flexible electrically conducting cloth having a length and a breadth is also provided comprising a plurality of intermingled or interwoven fibers of a refractory material having a sheet resistance above 1000 ohms per square. A conductive coating including at least about 70 atomic percent carbon encapsulates a majority of the coating. The coating is in sufficient quantity to render the cloth conducting with a sheet resistance between 0.1 and 1000 ohms per square. The cloth has a resistance across its breadth uniform to within about ±10% and a controllable resistance along its length.
Inventors
- 👤 Steven F. Rickborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:33
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/20; H05B3/34; H05B3/36; C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5001; D; D04; D04H; D04H1/00; D04H1/40; D04H1/42; D04H1/4209; D06; D06M; D06M11/00; D06M11/73; D06M11/74; H01; H01B; H01B1/00; H01B1/04; H01B1/20; H01B1/24; H01J; H01J29/00; H01J29/86; H01J29/867; H01J29/868; H01Q; H01Q17/00; H01Q17/005; H01J2229/00; H01J2229/863; H01J2229/8633; H05B2203/00; H05B2203/013; H05B2203/017; H05B2203/034
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
107 words
A flexible electrically conducting cloth, comprising: a plurality of intermingled or interwoven fibers of a refractory ceramic or of a refractory vitreous material, the sheet resistance of which exceeds 1,000 ohms per square; and a conducting coating encapsulating a majority of the fibers, said coating including at least about 70 atomic percent carbon, said coating being applied in sufficient quantity to render the cloth electrically conducting with a sheet resistance which lies between about 0.1 ohm per square and about 1,000 ohms per square, said coating having been formed by chemical vapor deposition at a temperature in a range from about 800° C. to about 1200° C.
Claim 2
Dependent Claim
107 words
A flexible electrically conducting cloth, comprising: a plurality of intermingled or interwoven fibers of a refractory ceramic or of a refractory vitreous material, the sheet resistance of which exceeds 1,000 ohms per square; and a conducting coating encapsulating a majority of the fibers, said coating including at least about 70 atomic percent carbon, said coating being applied in sufficient quantity to render the cloth electrically conducting with a sheet resistance which lies between about 0.1 ohm per square and about 1,000 ohms per square, said coating having been formed by chemical vapor deposition at a temperature in a range from about 800° C. to about 1200° C.
Claim 3
Dependent Claim
145 words
A cloth as set forth in claim 1, wherein said coating is formed by directly applying an organic precursor to the fibers, the applying being at a temperature below the sublimation, boiling or decomposition temperature of the organic precursor and subjecting the fibers to chemical vapor deposition conditions including a temperature which falls within a range from about 800° C. to about 1200° C., in the absence of oxygen, the organic precursor being selected to be substantially completely converted, by sublimation, boiling and/or decomposition, to one or more vaporous species in said deposition zone and further being selected to either (1) sublime or boil at a temperature in excess of about 400° C. or (2) to not decompose at a temperature of below about 300° C. if said organic precursor decomposes at a temperature below its sublimation or boiling temperature, to form said vaporous species.
Claim 4
Dependent Claim
32 words
A cloth as set forth in claim 1, wherein said coating comprises at least about 0.001 weight percent of said cloth and no more than about 17 weight percent of said cloth.
Claim 5
Dependent Claim
110 words
A flexible electrically conducting cloth, having a length and a breath, comprising: a plurality of intermingled or interwoven fibers of a refractory ceramic or of a refractory vitreous material the sheet resistance of which exceeds 1,000 ohms per square; and a conducting coating encapsulating a majority of the fibers, said coating including at least about 70 atomic percent carbon, said coating being applied in sufficient quantity to render the cloth electrically conducting with a sheet resistance which lies between about 0.1 ohm per square and about 1,000 ohms per square, said cloth having a resistance across its breadth uniform to within about ±10% and a controllable resistance along its length.
Claim 6
Dependent Claim
110 words
A flexible electrically conducting cloth, having a length and a breath, comprising: a plurality of intermingled or interwoven fibers of a refractory ceramic or of a refractory vitreous material the sheet resistance of which exceeds 1,000 ohms per square; and a conducting coating encapsulating a majority of the fibers, said coating including at least about 70 atomic percent carbon, said coating being applied in sufficient quantity to render the cloth electrically conducting with a sheet resistance which lies between about 0.1 ohm per square and about 1,000 ohms per square, said cloth having a resistance across its breadth uniform to within about ±10% and a controllable resistance along its length.
Claim 7
Dependent Claim
19 words
A cloth as set forth in claim 4, wherein said resistance is uniform along its length within about ±10%.
Claim 8
Dependent Claim
32 words
A cloth as set forth in claim 4, wherein said coating comprises at least about 0.001 weight percent of said cloth and no more than about 17 weight percent of said cloth.
Claim 9
Dependent Claim
31 words
A cloth as set forth in claim 4, wherein said coating is formed by chemical vapor deposition at a temperature in a range from about 800° C. to about 1200° C.
Claim 10
Dependent Claim
132 words
A cloth as set forth in claim 7, wherein said coating is formed by directly applying an organic precursor to the fibers, the applying being at a temperature below the sublimation, boiling or decomposition temperature of the organic precursor and subjecting the fibers to chemical vapor deposition conditions in said temperature range, in the absence of oxygen, the organic precursor being selected to be substantially completely converted, by sublimation, boiling and/or decomposition, to one or more vaper species in said decomposition zone and further being selected to either (1) sublime or boil at a temperature in excess of about 400° C. or (2) to not decompose at a temperature below about 300° C. if said organic precursor decomposes at a temperature below its sublimation or boiling temperature, to form said vapor species.
References Cited (Backward Citations)
US3349359A
Cited
US4477707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |