Patent US2865908A successfully refreshed from Google Patents.
US2865908A
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Stilbene azo dyes
Assignee: Wyeth Holdings LLC
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Filing: 1954-10-25
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Granted: 1958-12-23
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Expires: 1974-10-25
Abstract
No abstract record available.
Inventors
- 👤 Hoff Leon Brian De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:22
CPC Classifications
C; C09; C09B; C09B56/00; C09B56/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A PROCESS OF PREPARING STILBENE AZO DYES WHICH ON THE MUNSELL COLOR SYSTEM HAVE A HUE DESIGNATION OF FROM 8Y TO 10Y WHICH COMPRISES TREATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 4,4''-DINITROSTILBENE-2,2''DISULFONIC ACID AND ALKALI METAL SALTS THEREOF IN AN AQUEOUS ALKALINE MEDIUM WITH A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, ACETALDEHYDE AND GLUCOSE, IN THE PRESENCE OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF THE WATER-SOLUBLE CHLORIDES AND SULFATES OF ALKALI AND ALKALINE EARTH METALS AND AMMONIA, THE QUANTITY OF SAID WATER-SOLUBLE SALT BEIN FROM ABOUT 5% TO ABOUT 15% BY WEIGHT OF THE AQUEOUS SOLVENT PRESENT IN THE REACTION MIXTURE.
Claim 2
Dependent Claim
109 words
A PROCESS OF PREPARING STILBENE AZO DYES WHICH ON THE MUNSELL COLOR SYSTEM HAVE A HUE DESIGNATION OF FROM 8Y TO 10Y WHICH COMPRISES TREATING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF 4,4''-DINITROSTILBENE-2,2''DISULFONIC ACID AND ALKALI METAL SALTS THEREOF IN AN AQUEOUS ALKALINE MEDIUM WITH A REDUCING AGENT SELECTED FROM THE GROUP CONSISTING OF FORMALDEHYDE, ACETALDEHYDE AND GLUCOSE, IN THE PRESENCE OF A WATER-SOLUBLE SALT SELECTED FROM THE GROUP CONSISTING OF THE WATER-SOLUBLE CHLORIDES AND SULFATES OF ALKALI AND ALKALINE EARTH METALS AND AMMONIA, THE QUANTITY OF SAID WATER-SOLUBLE SALT BEIN FROM ABOUT 5% TO ABOUT 15% BY WEIGHT OF THE AQUEOUS SOLVENT PRESENT IN THE REACTION MIXTURE.
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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |