Patent US3600376A successfully refreshed from Google Patents.
US3600376A
Expired / Lapsed
US
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Method of preparing j-acid urea disazo dyestuffs
Assignee: EIDP Inc
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Filing: 1968-10-03
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Granted: 1971-08-17
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Expires: 1988-10-03
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 SEECTED 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
2026-10-30 23:37
CPC Classifications
C; C09; C09B; C09B33/00; C09B33/02; C09B33/08; C09B33/10; C09B41/00; C09B41/001; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 0
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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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |