US3671192A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of stabilizing acrylic polymer fibers prior to graphitization
Assignee: United States Department of the Air Force
•
Filing: 1968-05-28
•
Granted: 1972-06-20
•
Expires: 1988-05-28
Abstract
Abstract A METHOD OF STABILIZING ACRYLONITRILE POLYNER FIBERS PRIOR TO CARBONIZATION OR DIRECT GRAPHITIZATION IS DESCRIBED. THE METHOD COMPRISES THE STEP OF HEATING THE FIBERS AT 365-290*C., PERFERABLY AT 275*C., IN AN OXIDIZING ATMOSPHERE FOR, FOR EXAMPLE, ABOUT 3-7 HOURS, IN A MANNER SUCH AS TO DISSIPATE THE HEAT OF REACTION AND ALLOW CONTROLLED OXIDATION. THE STABILIZATION STEP WHEN FOLLOWED BY GRAPHITIZATION OF A POLYMER FIBER OR YARN AT A TEMPERATURE WITHIN THE RANGE OF 1800-3200*C. LEADS TO A GRAPHITE FIBER OF HIGH TENSILE STRENGTH, HIGH MODULUS OF ELASTICITY, AND A FIBER OF IMPROVED GRAPHITIC CHARACTER.
Inventors
- 👤 Herbert M Ezekiel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 00:04
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/32; D06M11/34; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; D01F9/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |