Patent US3814577A successfully refreshed from Google Patents.
US3814577A
Expired / Lapsed
US
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Method for producing graphitizable substrates from acrylic fibers
Assignee: Monsanto Co
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Filing: 1972-07-27
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Granted: 1974-06-04
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Expires: 1992-07-27
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 PROCESS INVOLVES FIRST TREATING THE FIBERS IN A DIETHANOLAMINE OR TRIETHANOLAMINE SOLUTION FOLLOWED BY AN OXIDATION AT ELEVATED TEMPERATURES IN AN OXYGEN CONTAINING ATMOSPHERE. THE PRE-OXIDATION TREATMENT DRASTICALLY REDUCES THE TIME REQUIRED TO EFFECT THE NECESSARY OXIDATION, AND THE HEAT-STABILIZED SUBSTRATE OBTAINED YIELDS CARBON AND/OR GRAPHITE FIBERS OF IMPROVED QUALITY.
Inventors
- 👤 V Menikheim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:01
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/368; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22; D01F9/225
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |