US2763683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of salicylanilide
Assignee: Dow Chemical Co
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Filing: 1955-01-05
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Granted: 1956-09-18
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Expires: 1975-01-05
Abstract
No abstract record available.
Inventors
- 👤 Eloyd L Beman
- 👤 Edgar C Britton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:44
CPC Classifications
C; C07; C07C; C07C233/00; C07C233/01; C07C233/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
A METHOD FOR THE PREPARATION OF SALICYLANILIDE WHICH COMPRISES THE STEPS OF ADDING APPROXIMATELY ONE MOLECULAR PROPORTION OF PHOSPHORUS TRICHLORIDE TO A MIXTURE OF APPROXIMATELY THREE MOLECULAR PROPORTIONS OF SALICYLIC ACID AND APPROXIMATELY THREE MOLECULAR PROPORTIONS OF ANILINE IN THE PRESENCE OF AN INERT DILUENT LIQUID, AT A TEMPERATURE BELOW ABOUT 25* C., THEREAFTER RAISING THE TEMPERATURE OF THE REACTION MIXTURE AND BOILING THE REACTION MIXTURE AT TEMPERATURES BETWEEN ABOUT 75* C. AND ABOUT 180* C. UNTIL THE ELIMINATION OF HYDROGEN CHLORIDE FROM THE REACTION MIXTURE IS SUBSTANTIALLY COMPLETE, AND SEPARATING SALICYLANILIDE FROM 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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |