US3804791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamide spinning dope
Assignee: EIDP Inc
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Filing: 1972-10-27
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Granted: 1974-04-16
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Expires: 1992-10-27
Abstract
Abstract AN ANISOTROPIC DOPE COMPRISING A POLYAMIDE IN CONCENTRATED SULFUR ACID WITHIN THE CONCENTRATION RANGE OF ABOUT 96-104% H2SO4; SAID POLYAMIDE CONSISTING ESSENTIALLY OF RECURRING UNITS OF THE FORMULA: -HN-R1-NHCO-R2-CO- WHEREIN R1 IS DIVALENT ORGANIC RADICAL SELECTED FROM THE GROUP OF 1,4 - PHENYLENE; TRANS-1,4-CYCLOHEXYLENE; 4,4''AZODIPHENYLENE; 4,4''-AZOXYDIPHENYLENE; AND 4,4''-CARBONAMIDODIPHENYLENE; R2 IS A DIVALENT ORGANIC RADICAL SELECTED FROM THE GROUP OF 1,4 - PHENYLENE; TRANS - 1,4CYCLOHEXYLENE; 2,5 - PYRIDYLENE; 4,4'' - AZODIPHENYLENE; BEING A RADICAL SELECTED FROM THE GROUP OF 4,4''-AZODIPHENYLENE AND 4,4''-AZOXYDIPHENYLENE.
Inventors
- 👤 P Morgan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:28
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08K; C08K3/00; C08K3/30; C08J2377/00; C08J2377/10
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |