US3579401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing thermal insulating carbonized felt laminated assemblies
Assignee: Mersen SA
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Filing: 1967-06-30
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Granted: 1971-05-18
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Expires: 1987-06-30
Abstract
Abstract A LOW DENSITY CARBON FELT ASSEMBLY FOR THERMAL INSULATION IS MADE BY ARRANGING A NUMBER OF LAYERS OF VISCOSE RAYON FELT COATED WITH A RELATIVELY SMALL AMOUNT OF FURANE RESIN, APPLYING A VERY LIGHT PRESSURE, E.G. ABOUT 5 G./CM.2, POLYMERISING AT ATMOSPHERIC CONDITIONS, AND CARBONISING AT A TEMPERATURE OF 900* TO 1200*C. THE LAYERS MAY BE STACKED ONE UPON ANOTHER, OR WOUND IN APPROXIMATELY CYLINDRICAL LAYERS ONE AROUND THE OTHER. THE CARBONISED PRODUCT MAY BE GRAPHITISED AT 2400* TO 3000*C. THUS, A THERMAL INSULATING CARBONIZED OR GRAPHITIZED VISCOSE RAYON HAVING A DENSITY OF LESS THAN 0.485 GM./CM.3 IS PRODUCED.
Inventors
- 👤 Roland Cauville
- 👤 Andre Pernollet
- 👤 Gilberte Moutaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:08
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; Y; Y10; Y10S; Y10S264/00; Y10S264/19; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31953; Y10T428/31971; Y10T442/00; Y10T442/50; Y10T442/56
Claims Analysis
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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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |