US3621089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for spinning dye-resistant copolyamide filaments
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1966-09-13
•
Granted: 1971-11-16
•
Expires: 1986-09-13
Abstract
Abstract A terpolyamide, formed from reactants polymerized in the presence of the equivalent of at least 3.0 mole percent of a monofunctional acid or basic stabilizer, is melt spun into filaments which are subsequently cold drawn.
Inventors
- 👤 Owen Burchell Edgar
- 👤 Michael Richard Yates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:24
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; G; G21; G21C; G21C3/00; G21C3/30; G21C3/36; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
A process according to claim 1 wherein the stabilizer is adipic acid or terephthalic acid.
Claim 2
Dependent Claim
12 words
A process according to claim 1 wherein the stabilizer is hexamethylene diamine.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein the third polyamide forming member is present in amounts of 5 to 10 percent by weight of said mixture.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |