Patent US2774648A successfully refreshed from Google Patents.
US2774648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing of polyacrylonitrile with vat dyes
Assignee: Wyeth Holdings LLC
•
Filing: 1952-05-17
•
Granted: 1956-12-18
•
Expires: 1972-05-17
Abstract
No abstract record available.
Inventors
- 👤 Jerry M Mecco
- 👤 Joseph W Creely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:01
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/225
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A METHOD OF DYEING WITH VAT DYES POLYACRYLONITRILE FIBERS WHICH ARE COPOLYMERS OF ACRYLONITRILE AND A SMALL AMOUNT OF METHYL ACRYLATE AND SPUN FROM A CONCENTRATED AQUEOUS THIOCYANATE SOLUTION, WHICH COMPRISES HEATING AT A TEMPERATURE BETWEEN 160*-325* F. THE SAID FIBERS IN AN AQUEOUS DYEBATH CONTAINING AN UNESTERIFIED LEUCO VAT DYESTUFF, A REDUCING AGENT AND A SUFFICIENT AMOUNT OF ZIRCONIUM OXYCHLORIDE TO SUBSTANTIALLY REDUCE HEAT YELLOWING OF SAID FIBER, THE DYEBATH HAVING A PH BETWEEN 6 AND 8, MAINTAINING THE PH OF SAID AQUEOUS DYEBATH BETWEEN 6 AND 8 DURING SAID HEATING UNTIL THE DYEING IS COMPLETE AND OXIDIZING THE DYESTUFF ON THE FIBER.
Claim 2
Independent Claim
104 words
A METHOD OF DYEING WITH VAT DYES POLYACRYLONITRILE FIBERS WHICH ARE COPOLYMERS OF ACRYLONITRILE AND A SMALL AMOUNT OF METHYL ACRYLATE AND SPUN FROM A CONCENTRATED AQUEOUS THIOCYANATE SOLUTION, WHICH COMPRISES HEATING AT A TEMPERATURE BETWEEN 160*-325* F. THE SAID FIBERS IN AN AQUEOUS DYEBATH CONTAINING AN UNESTERIFIED LEUCO VAT DYESTUFF, A REDUCING AGENT AND A SUFFICIENT AMOUNT OF ZIRCONIUM OXYCHLORIDE TO SUBSTANTIALLY REDUCE HEAT YELLOWING OF SAID FIBER, THE DYEBATH HAVING A PH BETWEEN 6 AND 8, MAINTAINING THE PH OF SAID AQUEOUS DYEBATH BETWEEN 6 AND 8 DURING SAID HEATING UNTIL THE DYEING IS COMPLETE AND OXIDIZING THE DYESTUFF ON THE FIBER.
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) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |