US3607541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing pyrolytic carbon impregnated thermal insulating carbonized felt
Assignee: Mersen SA
•
Filing: 1967-06-30
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Granted: 1971-09-21
•
Expires: 1987-06-30
Abstract
Abstract For high-temperature thermal insulation, e.g., for rockets or missiles, a low density carbon felt assembly of carbonized viscose rayon felt is appropriately shaped and subjected to pyrolysis with a gas-containing chemically combined carbon, e.g., methane, at a reduced pressure and at low or high temperatures, e.g., 1,800* C.
Inventors
- 👤 Francis Tombrel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:26
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/16; C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B35/83; D01F11/00; D01F11/10; D01F11/12; D01F11/125; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24851; Y10T428/24868; Y10T428/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
12 words
A process according to claim 1 wherein the said gas in methane.
Claim 2
Dependent Claim
19 words
A process according to claim 1 wherein said gas is a mixture of nitrogen and methane under reduced pressure.
Claim 3
Dependent Claim
35 words
A process according to claim 3 wherein pyrolytic carbon is deposited within the laminate at the rate of 5 grams/hour at the commencement of pyrolysis decreasing to 0.5 grams/hour at the end of the pyrolysis.
Claim 4
Dependent Claim
14 words
A process according to claim 3 wherein the time of pyrolysis is 10-30 hours.
Claim 5
Dependent Claim
15 words
A process according to claim 3 wherein the carbonized assembly is graphitized at 2,400*-3,000* C.
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |