US3829543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melt spinning of polymers
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1972-07-14
•
Granted: 1974-08-13
•
Expires: 1992-07-14
Abstract
Abstract Manufacture of at least two filaments or groups of filaments by melt-spinning thermoplastic polymer with incorporation of different colouring material wherein molecular weight is adjusted additively to reduction caused by colouring material to give same molecular weight of polymer in filaments.
Inventors
- 👤 W Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 05:58
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/06; D01F6/00; D01F6/58; D01F6/62
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
A process according to either of claim 1 wherein said coloring material is an azo compound which is a disperse dye as listed in the Color Index.
Claim 2
Dependent Claim
70 words
A process according to either of claim 2 wherein said coloring material is C1 Disperse Red 72, C1 Disperse Orange 30, C1 Disperse Red 54, C1 Disperse Red 74, C1 Disperse Red 167, C1 Disperse Blue 79, C1 Disperse Yellow 42, C1 Disperse Brown 4, C1 Disperse Blue 219, C1 Disperse Red 131, C1 Disperse Orange 13, C1 Disperse Violet 33, C1 Disperse Red 65 or C1 Disperse Blue 122.
Claim 3
Dependent Claim
70 words
A process according to claim 1 wherein the non-colored additive is a glycol, a monohydric alcohol, a glycol, a monocarboxylic acid, a dicarboxylic acid, the dialkyl ester of a dicarboxylic acid wherein alkyl is of from one to four carbon atoms, a diphenyl ester of a mono or a dicarboxylic acid, a diglycol ester of a dicarboxylic acid or an oligomer of a polyester of up to four structural units.
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) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |