US3701624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyeing cotton and paper with bis(arylazo or sulfoarylazo)-j-acid urea reaction mixture and composition therefor
Assignee: EIDP Inc
•
Filing: 1971-02-01
•
Granted: 1972-10-31
•
Expires: 1991-02-01
Abstract
Abstract DIRECT BIS(ARYLAZO- AND SULFOARYLAZO)-J-ACID UREA DYESTUFFS, USEFUL FOR DYEING CELLULOSIC MATERIALS, THEIR PREPARATION BY A PROCESS WHICH COMPRISES COUPLING AN ARYL OR SULFOARYL DIAZONIUM COMPOUND TO J-ACID UREA IN A NEUTRAL TO ALKALINE AQUEOUS MEDIUM TO WHICH IS ADDED A LITHIUM BASE SELECTED FROM THE HYDROXIDE, BICARBONATE AND CARBONATE, AND STABLE, UNIFORM, AQUEOUS, DYE PASTES OF SAID DYES.
Inventors
- 👤 Richard C Franklin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:13
CPC Classifications
C; C09; C09B; C09B41/00; C09B41/001; C09B33/00; C09B33/02; C09B33/08; C09B33/10; Y; Y10; Y10S; Y10S8/00; Y10S8/937
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |