US3810876A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of increasing the molecular weight of molten polyamides with diaryl esters
Assignee: Imperial Chemical Industries Ltd
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Filing: 1972-02-04
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Granted: 1974-05-14
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Expires: 1992-02-04
Abstract
Abstract A PROCESS FOR INCREASING THE CHAIN LENGHT AND HENCE THE VISCOSITY OF SYNTHETIC LINEAR POLYAMIDES, WHILST PRESERVING THE LINERITY BY MEANS OF ADDITION OF A DEFINED CLASS OF DIARYL ESTERS. ALSO INCLUDED IN THE INVENTION ARE THE POLYMERS WITH INCREASED VISCOSITY AND SHAPED PRODUCTS MADE THEREFROM.
Inventors
- 👤 C Cowell
- 👤 J Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:18
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/10; C; C08; C08G; C08G69/00; C08G69/48; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; D01F6/00; D01F6/58; D01F6/60; D01F6/78; D01F6/80
Claims Analysis
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References Cited (Backward Citations)
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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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |