Patent US2802869A successfully refreshed from Google Patents.
US2802869A
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Method of making cinnamic acid and salts thereof
Assignee: Dow Chemical Co
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Filing: 1952-12-08
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Granted: 1957-08-13
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Expires: 1972-12-08
Abstract
No abstract record available.
Inventors
- 👤 Robert S Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:52
CPC Classifications
C; C07; C07C; C07C57/00; C07C57/30; C07C57/42; C07C57/44; C07C51/00; C07C51/08; C07C51/347; C07C51/377
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A METHOD WHICH COMPRISES HEATING ONE MOLECULAR EQUIVALENT OF BETA-HYDROXY-BETA-PHENYL-PROPIONITRILE TO-ULE TO GETHER WITH FROM 1.25 TO 2 MOLECULAR EQUIVALENTS OFF SODIUM HYDROXIDE, IN THE FORM OF A FROM 5 TO 15 PERCENT BY WEIGHT AQUEOUS SOLUTION THEREOF, TO APPROXIMATELY THE BOILING TEMPERATURE OF THE MIXTURE AT ABOUT ATMOS-PHERIC PRESSURE FOR FROM 8 TO 10 HOURS, PRECIPITATING TARRY METERIAL FROM THE REACTION LIQUOR BY TREATING THE LATTER WITH AN ACID IN AMOUNT RENDERING THE LIQUOR ONLY SLIGHTLYLY ALKALINE AND REMOVING THE PRECIPITATE, THEREAFTER ACIDI-FYING THE LIQUOR TO PRECIPITATE CINNAMIC ACID THEREFROM AND SEPARATING CINNAMIC ACID FROM THE 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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |