Patent US3677705A successfully refreshed from Google Patents.
US3677705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the carbonization of a stabilized acrylic fibrous material
Assignee: Celanese Corp
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Filing: 1970-03-09
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Granted: 1972-07-18
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Expires: 1990-03-09
Abstract
Abstract A PROCESS IS PROVIDED FOR THE RAPID CONVERSION OF A CONTINUOUS LENGTH OF AN INHERENTLY HYGROSCOPIC STABILIZED ACRYLONINITRILE HOMOPOLYMER OR COPOLYMER TO A CARBONIZED FORM EXHIBITING IMPROVED PHYSICAL PROPERTIES. THE STABILIZED STARTING MATERIAL IS SUPPLIED IN AN ESSENTIALLY ANHYDROUS FORM IMMEDIATELY PRIOR TO ITS PASSAGE THROUGH A HEATING ZONE CONTAINING AN INERT ATMOSPHERE IN WHICH ITS TEMPERATURE IS RELATIVELY RAPIDLY TO PRODUCE A CARBONIZED FIBROUS MATERIAL. THE RESULTING CONTINUOUS LENGTH OF CARBONIZED FIBROUS MATERIAL MAY BE SUBSEQUENTLY CONVERTED TO A CONTINUOUS LENGTH OF FIBROUS GRAPHITIC CARBON POSSESSING SUPERIOR PROPERTIES.
Inventors
- 👤 Michael J Ram
- 👤 John P Riggs
- 👤 Charles M Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:50
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |