US3755255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides having improved dyeability prepared from aromatic carboxylic disulfonated compounds
Assignee: Individual
•
Filing: 1971-06-09
•
Granted: 1973-08-28
•
Expires: 1991-06-09
Abstract
Abstract Basic dye affinity for polyamides is improved by interpolymerizing defined aromatic carboxylic disulphonated compounds with conventional polyamide monomer.
Inventors
- 👤 J Lodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:00
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/42; C07; C07C; C07C309/00; C07C309/01; C07C309/28; C07C309/57; C07C309/58; C07C309/60
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The product of claim 1 wherein the said disulfonated salt is 4,4''-di(carboxymethylene)diphenyl-ether-2,2''- disulfonate salt.
Claim 2
Dependent Claim
11 words
The product of claim 1 wherein M is sodium or potassium.
Claim 3
Dependent Claim
11 words
The product of claim 1 in the form of a filament.
Claim 4
Dependent Claim
11 words
The product of claim 1 wherein said polyamide is polyhexamethylene adipamide.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |