Patent US2702802A successfully refreshed from Google Patents.
US2702802A
Expired / Lapsed
US
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Process of making isocinchomeronic acid and decarboxylation of same to niacin
Assignee: Individual
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Filing: 1951-12-27
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Granted: 1955-02-22
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Expires: 1971-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert S Aries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:17
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
72 words
THE METHOD OF MAKING NIACIN FROM ISOCINCHOMERONIC ACID BY THE DECARBOXYLATION THEREOF BY HEAT WITH RECOVERY OF THE NIACIN PRODUCED, CHARACTERIZED BY MIXING ISOCINCHOMERONIC ACID IN THE NON-REACTIVE, SUBSTANTIALLY NON-CORROSIVE LIQUID VEHICLE SELECTED FROM THE GROUP CONSISTING OF WATER, HIGH TEMPERATURE HEAT TRANSFER OIL, CONCENTRATED SULFURIC ACID AND CYCLOHEXANONE, AND HEATING THE MIXTURE OF A DECARBOXYLATING TEMPERATURE RANGE ABOVE 180* C. AND MAINTAINING SUCH TEMPERATURE RANGE UNTIL THE DECARBOXYLATION IS SUBSTANTIALLY COMPLETE.
Claim 2
Independent Claim
72 words
THE METHOD OF MAKING NIACIN FROM ISOCINCHOMERONIC ACID BY THE DECARBOXYLATION THEREOF BY HEAT WITH RECOVERY OF THE NIACIN PRODUCED, CHARACTERIZED BY MIXING ISOCINCHOMERONIC ACID IN THE NON-REACTIVE, SUBSTANTIALLY NON-CORROSIVE LIQUID VEHICLE SELECTED FROM THE GROUP CONSISTING OF WATER, HIGH TEMPERATURE HEAT TRANSFER OIL, CONCENTRATED SULFURIC ACID AND CYCLOHEXANONE, AND HEATING THE MIXTURE OF A DECARBOXYLATING TEMPERATURE RANGE ABOVE 180* C. AND MAINTAINING SUCH TEMPERATURE RANGE UNTIL THE DECARBOXYLATION IS SUBSTANTIALLY COMPLETE.
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) | 1958-02-21 | 1958-08-23 | 1959-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-21 | 1962-08-23 | 1963-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-21 | 1966-08-23 | 1967-02-22 | $7700.00 | Window Closed / Lapsed |