US3844877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbonaceous fabric laminate
Assignee: BP Corp North America Inc
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Filing: 1971-12-06
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Granted: 1974-10-29
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Expires: 1991-12-06
Abstract
Abstract A lightweight refractory thermal insulator is provided. Superposed layers of carbonaceous fabric are cemented together to form a laminate which, because of its low weight, structural integrity, and excellent thermal resistance, is useful as thermal insulation in a variety of applications. If desired, a thin uniform film or coating of carbon black may be interspersed between the layers of carbonaceous fabric in order to impart improved thermal properties to the laminate.
Inventors
- 👤 T Wessendorf
- 👤 J Criscione
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/02; B32B5/022; B32B17/00; B32B17/02; D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H27/00; D21H27/30; D21H27/32; B32B2262/00; B32B2262/10; B32B2262/106; D21H13/00; D21H13/36; D21H13/46; D21H13/50; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/33; D21H17/46; D21H17/47; D21H17/48; D21H17/52; D21H17/61; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T442/00; Y10T442/50; Y10T442/59
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
A LAMINATE STRUCTURE HAVING A THERMAL CONDUCTIVITY NO GREATER THAN 0.077 BTU-FT./FT,2-HR.-*F. AND A THERMAL DIFFUSIVITY NO GREATER THAN 0.0024CM,2/SECOND AT ROOM TEMPERATURE, AS MEASURED BY THE LASER PULSE TECHNIQUE, COMPRISING A PLURALITY OF SUPERPOSED LAYERS OF NON-WOVEN PAPER-THIN FELT MADE FROM CARBON FIBERS, WHEREIN EACH LAYER OF PAPER-THIN FELT IS FROM 0.001 TO 0.003 INCHES THICK, BONDED TOGETHER WITH A CARBONIZED BINDER.
Claim 2
Dependent Claim
63 words
A LAMINATE STRUCTURE HAVING A THERMAL CONDUCTIVITY NO GREATER THAN 0.077 BTU-FT./FT,2-HR.-*F. AND A THERMAL DIFFUSIVITY NO GREATER THAN 0.0024CM,2/SECOND AT ROOM TEMPERATURE, AS MEASURED BY THE LASER PULSE TECHNIQUE, COMPRISING A PLURALITY OF SUPERPOSED LAYERS OF NON-WOVEN PAPER-THIN FELT MADE FROM CARBON FIBERS, WHEREIN EACH LAYER OF PAPER-THIN FELT IS FROM 0.001 TO 0.003 INCHES THICK, BONDED TOGETHER WITH A CARBONIZED BINDER.
Claim 3
Dependent Claim
23 words
A laminate structure as in claim 1 in which the carbon fibers of the paper-thin felt layers are about one-fourth inch in length.
Claim 4
Dependent Claim
16 words
A laminate structure as in claim 1 having from five to 15 layers of paper-thin felt.
Claim 5
Dependent Claim
23 words
A laminate structure as in claim 3 in which the carbon fibers of the paper-thin felt layers are about 1/4 inch in length.
Claim 6
Dependent Claim
86 words
A laminate structure having a thermal conductivity no greater than 0.077 BTU-ft./ft.2-hr.-*F. and a thermal diffusivity no greater than 0.0024 cm.2/second at room temperature, as measured by the laser pulse technique, comprising a plurality of superposed layers of non-woven paper-thin felt made from carbon fibers, wherein each layer of paper-thin felt is from 0.001 to 0.003 inches thick and is interspersed with thin uniform layers of carbon black, each layer of carbon black being less than 0.001 inches thick, and bonded together with a carbonizable binder.
Claim 7
Dependent Claim
86 words
A laminate structure having a thermal conductivity no greater than 0.077 BTU-ft./ft.2-hr.-*F. and a thermal diffusivity no greater than 0.0024 cm.2/second at room temperature, as measured by the laser pulse technique, comprising a plurality of superposed layers of non-woven paper-thin felt made from carbon fibers, wherein each layer of paper-thin felt is from 0.001 to 0.003 inches thick and is interspersed with thin uniform layers of carbon black, each layer of carbon black being less than 0.001 inches thick, and bonded together with a carbonizable binder.
Claim 8
Dependent Claim
23 words
A laminate structure as in claim 5 in which the carbon fibers of the paper-thin felt layers are about 1/4 inch in length.
Claim 9
Dependent Claim
16 words
A laminate structure as in claim 5 having from five to 15 layers of paper-thin felt.
Claim 10
Dependent Claim
23 words
A laminate structure as in claim 7 in which the carbon fibers of the paper-thin felt layers are about one-fourth inch in length.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |