US2913802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal modification of acrylonitrile yarns
Assignee: Johns Manville Corp
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Filing: 1953-07-16
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Granted: 1959-11-24
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Expires: 1973-07-16
Abstract
No abstract record available.
Inventors
- 👤 Barnett Irvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:32
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; D01F9/225; D06C; D06C29/00; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
109 words
IN THE METHOD OF THERMALLY MODIFYING YARNS COM POSED OF A POLYMER CONTAINING ACRYLONITRILE WHICH COMPRISES SUBJECTING SAID YARNS TO AIR AT A TEMPERATURE WITHIN THE RANGE FROM APPROXIMATELY 300*F. TO THE DEPOLYMERIZATION TEMPERATURE OF THE POLYMER FOR AT LEAST APPROXIMATELY ONE-HALF HOUR WHEREBY SAID YARNS COMPOSED OF A POLYMER CONTAINING ACRYLONITRILE ARE EXPOSED TO SAID MODIFYING TEMPERATURES FOR A PERIOD OF TIME SUFFICIENT TO RESULT IN A NEW FILAMENTARY MATERIAL WHICH CONTAINS AT LEAST APPROXIMATELY 60% BY WEIGHT OF A THERMOSTABLE, NON-IGNITIBLE, THERMALLY MODIFIED MATERIAL, THE IMPROVEMENT WHICH COMPRISES IMPARTING TO SAID YARNS, PRIOR TO THERMAL MODIFICATION, A TWIST DETERMINED BY EMPLOYING A TWIST CONSTANT OF APPROXIMATELY 70-250.
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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) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |