US3122529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of stilbene azo dyes
Assignee: GAF Chemicals Corp
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Filing: 1959-11-16
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Granted: 1964-02-25
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Expires: 1979-11-16
Abstract
No abstract record available.
Inventors
- 👤 William G Huey
- 👤 Salvatore L Cannone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:19
CPC Classifications
C; C09; C09B; C09B56/00; C09B56/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
86 words
THE PROCESS OF PRODUCING STILBENE AZO DYES WHICH COMPRISES TREATING 4,4''-DINITRO-2,2''-STILBENE DISULFONIC ACID IN AN AQUEOUS MEDIUM WITH AT LEAST 2 MOLAR PROPORTIONS THEREOF OF AN ALKYLOLAMINE, THE ALKYLOL GROUPS OF WHICH CONTAIN 2-3 CARBN ATOMS EACH IN THE PRESENCE OF 5 TO 20% BASED ON THE AMOUNT OF WATER PRESENT OF A WATERSOLUBLE NEUTRAL SALT OF A MEMBER OF THE GROUP CONSISTING OF ALKALI METALS, AND AMMONIA, THEREAFTER ACIDIFYING THE REACTION MIXTURE TO A PH NOT GREATER THAN 4 AND RECOVERING THE THUS PRODUCED DYESTUFF.
Claim 2
Dependent Claim
86 words
THE PROCESS OF PRODUCING STILBENE AZO DYES WHICH COMPRISES TREATING 4,4''-DINITRO-2,2''-STILBENE DISULFONIC ACID IN AN AQUEOUS MEDIUM WITH AT LEAST 2 MOLAR PROPORTIONS THEREOF OF AN ALKYLOLAMINE, THE ALKYLOL GROUPS OF WHICH CONTAIN 2-3 CARBN ATOMS EACH IN THE PRESENCE OF 5 TO 20% BASED ON THE AMOUNT OF WATER PRESENT OF A WATERSOLUBLE NEUTRAL SALT OF A MEMBER OF THE GROUP CONSISTING OF ALKALI METALS, AND AMMONIA, THEREAFTER ACIDIFYING THE REACTION MIXTURE TO A PH NOT GREATER THAN 4 AND RECOVERING THE THUS PRODUCED DYESTUFF.
References Cited (Backward Citations)
US1878501A
Cited
US2865908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-02-24 | 1967-08-26 | 1968-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-24 | 1971-08-26 | 1972-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-24 | 1975-08-26 | 1976-02-25 | $7700.00 | Window Closed / Lapsed |