US3687904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1970-12-04
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Granted: 1972-08-29
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Expires: 1990-12-04
Abstract
Abstract Deep dye polyamides prepared from thermally stable polymers, e.g., 6 or 6.8 nylon, using excess base stabilizer in the presence of a chain branching agent.
Inventors
- 👤 Ronald David Middleton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:05
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
Polyamide according to claim 1 wherein the chain-branching agent is bis-hexamethylene triamine and sebacic acid is included in the polymerization system in amounts sufficient to increase the melt viscosity of the modified polyamide.
Claim 2
Dependent Claim
25 words
The modified polyamide according to claim 1 wherein said polymer is selected from the group consisting of poly-epsilon-caprolactam, polyhexamethylene suberamide, polyhexamethylene sebacamide, and polyamino-undecanOic acid.
Claim 3
Dependent Claim
33 words
A modified polyamide according to claim 1 wherein the polymer is selected from the class consisting of co-polymers of hexamethylene diammonium adipate and epsilon-caprolactam in proportions of 75/25 to 25/75 parts by weight.
Claim 4
Dependent Claim
9 words
Filament or fiber of the polyamide of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |