Patent US3793204A successfully refreshed from Google Patents.
US3793204A
Expired / Lapsed
US
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Thermal insulation
Assignee: United States Atomic Energy Commission
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Filing: 1972-07-28
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Granted: 1974-02-19
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Expires: 1992-07-28
Abstract
Abstract The thermal insulating properties of fibrous thermal insulation are improved for high temperature applications by incorporating graphite flakes in the insulation to substantially reduce radiant heat transfer in fibrous insulation which comprises randomly oriented fibers joined primarily at their nexus by a binder of carbonized starch and graphite flakes oriented in the insulation with the greatest surface area of the flakes being disposed normal to the direction of radiant heat transfer.
Inventors
- 👤 Z Ardary
- 👤 D Sturgis
- 👤 C Reynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; C04B35/00; C04B35/515; C04B35/52; C04B35/71; C04B35/78; C04B35/80; C04B35/83; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/268; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/298; Y10T428/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
64 words
The improved thermal insulating composite claimed in claim 1, wherein the graphite flakes have a thickness in the range of about 0.005 to 0.010 inch and a surface area in the range of 15 to 25 square meters per gram, and wherein the starch:fiber: graphite flake weight ratio in the composite prior to carbonizing the starch is in the range of 1.0:1.0:0.5 to 1.0:1.0:2.0.
Claim 2
Dependent Claim
38 words
The improved thermal insulating composite claimed in claim 2, wherein the fibers consist essentially of carbon, are of a diameter of about 2 microns, and are of a length in the range of about 10 to 30 mils.
Claim 3
Independent Claim
160 words
A method for manufacturing a thermal insulating composite consisting of randomly oriented fibers joined together by a carbonized binder and graphite flakes dispersed within the composite in substantially parallel planes, comprising the steps of mixing together graphite flakes with a plurality of fibers of a carbonaceous or refractory material, particulate vegetable starch having a particle size of about 10 microns, and water for forming a slurry of the flakes, fibers and starch, forming the slurry into a desired configuration by contacting a perforated mold with the slurry, subjecting the slurry through the perforated mold to a pressure less than atmospheric to form and maintain the slurry in a contacting relationship with the mold and to position the flakes in said substantially parallel planes, maintaining said pressure for removing excess water from the slurry, heating the formed slurry to a temperature adequate to at least gelatinize the starch, and thereafter heating the composite in an inert atmosphere to carbonize the starch.
Claim 4
Dependent Claim
67 words
The method for manufacturing a thermal insulating composite as claimed in claim 4, wherein the graphite flakes have a thickness in the range of about 0.005 to 0.010 inch and a surface area in the range of 15 to 25 square meters per gram, and wherein the starch:fiber:graphite flake weight ratio in the composite prior to carbonizing the starch is in the range of 1.0:1.0:0.5 to 1.0:1.0:2.0.
Claim 5
Dependent Claim
42 words
The method for manufacturing a thermal insulating composite as claimed in claim 4, wherein the fibers consist essentially of carbon. are of a diameter of about 2 microns, and are of a length in the range of about 10 to 30 mils.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |