US3720744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for treating elastomeric fibers
Assignee: Celanese Corp
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Filing: 1971-03-23
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Granted: 1973-03-13
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Expires: 1991-03-23
Abstract
Abstract AN IMPROVED SPANDEX TYPE FIBER OF LOW PEMANENT SET AND A METHOD FOR PRODUCING SUCH FIBERS WHICH METHOD COMPRISES REACTING THE POLYMER WITH A PEROXIDE CROSSLINKING AGENT AND SUBSEQUENTLY HEAT TREATING A FIBER SPUN FROM SAID POLYMER AT A TEMPERATURE OF ABOUT 50 TO 200 DEGREES CENTRIGRADE TO EFFECT A CROSS-LINKING OF THE POLYMER.
Inventors
- 👤 J Santangelo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:21
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/86; D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; D01F6/00; D01F6/58; D01F6/70
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |