US3557544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions and yarn made therefrom
Assignee: Celanese Corp
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Filing: 1967-03-09
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Granted: 1971-01-26
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Expires: 1987-03-09
Abstract
Abstract The copolymer of polyhexamethylene adipamide (nylon 66) and polycaprolactam (nylon 6) is produced by heating a blend of chips of the two polymers at a temperature less than the molting point of either of the polymeric materials while passing an inert gas over the chips. the water content in the chips is reduced to such an extend that the polymeric materials are no longer in equilibrium with their water of condensation. Upon melting the polymeric materials react with one another to form a copolymer and equilibrate rapidly to form a copolymer having a higher relative viscosity (RV).
Inventors
- 👤 Frank Holmes Simons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:15
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/04; C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; C08G63/80; C08G69/00; C08G69/02; C08G69/04; C08G69/06; D01F; D01F6/00; D01F6/78; D01F6/80; Y; Y10; Y10S; Y10S57/00; Y10S57/902
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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |