US3817700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating acrylic fibers to obtain carbonizable and graphitizable substrates
Assignee: Monsanto Co
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Filing: 1972-04-13
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Granted: 1974-06-18
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Expires: 1992-04-13
Abstract
Abstract A PROCESS IS PROVIDED FOR PRODUCING A HEAT-STABILIZED CHAR OR SUBSTRATE FROM ACRYLIC FIBERS WHICH CAN BE CONVERTED INTO HIGH QUALITY CARBON OR GRAPHITE FIBERS. THE FIBERS ARE FIRST TREATED IN A POLYOL SOLUTION CONTAINING A BASIC NITRILE POLYMERIZATION CATALYST FOLLOWED BY AN AIROXIDATION AT TEMPERATURES OF 270*C. AND ABOVE. THE PREOXIDATION TREATMENT DRASTICALLY REDUCES THE TIME NORMALLY REQUIRED FOR EFFECTING THE NECESSARY OXIDATION. THE CARBONIZABLE OR GRAPHITIZABLE SUBSTRATED OBTAINED YIELD CARBON AND GRAPHITE FIBERS OF IMPROVED PROPERTIES.
Inventors
- 👤 V Menikheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:14
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; D01F9/225; D06; D06M; D06M11/00; D06M11/32; D06M11/34
Claims Analysis
Total Claims: 0
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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) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |