US2563354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acylation of amino stilbene sulfonic acids
Assignee: Wyeth Holdings LLC
•
Filing: 1949-07-07
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Granted: 1951-08-07
•
Expires: 1969-07-07
Abstract
No abstract record available.
Inventors
- 👤 Munro Wendell Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:13
CPC Classifications
C; C07; C07C; C07C39/00; C07C39/205; C07C39/21; C07C39/215; C07C303/00; C07C303/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
IN A PROCESS OF REACTING, IN AQUEOUS MEDIUM, 4,4''-DIAMINO-STILBENE-2,2''-DISULFONIC ACID WITH A CARBOXYLIC ACID CHLORIDE OF THE BENZENE SERIES, WHEREBY HYDROCHLORIC ACID IS LIBERATED, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION AT A TEMPERATURE OF FROM -5* C. TO 40* C. IN THE PRESENCE OF POTASSIUM CARBONATE TO ACT AS ACID BINDER FOR THE LIBERATED HYDROCHLORIC ACID.
Claim 2
Dependent Claim
58 words
IN A PROCESS OF REACTING, IN AQUEOUS MEDIUM, 4,4''-DIAMINO-STILBENE-2,2''-DISULFONIC ACID WITH A CARBOXYLIC ACID CHLORIDE OF THE BENZENE SERIES, WHEREBY HYDROCHLORIC ACID IS LIBERATED, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION AT A TEMPERATURE OF FROM -5* C. TO 40* C. IN THE PRESENCE OF POTASSIUM CARBONATE TO ACT AS ACID BINDER FOR THE LIBERATED HYDROCHLORIC ACID.
References Cited (Backward Citations)
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Cited
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GB442530A
Cited
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Cited
US2308640A
Cited
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Cited
US2468431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |