US2708196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclic process for the preparation of isocinchomeronic acid and niacin and recovery of niacin
Assignee: Aries SAS
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Filing: 1951-12-27
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Granted: 1955-05-10
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Expires: 1971-12-27
Abstract
No abstract record available.
Inventors
- 👤 Robert S Aries
- 👤 Albert P Sachs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:11
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
116 words
IN THE MANUFACTURE OF NIACIN FROM 2-METHYL-5-ETHYLPYRIDINE, THE CONTINUOUS PROCESS WHICH COMPRISES THE STEPS OF CONDUCTING A MIXTURE OF 2-MERHYL-5-ETHYL-PYRIDINE, ISOCINCHOMERONIC ACID AND NITRIC ACID TO A REACTION ZONE, MAINTAINING THEREIN A TEMPERATURE NOT SUBSTANTIALLY ABOVE THE RANGE OF 180-185* C. AT WHICH SAID 2-METHYL5-ETHYL-PYRIDINE IS CONVERTED AT LEAST IN PART OF ISOCINCHOMERONIC ACID AND SAID ISOCINOCHOERONIC ACID IS PARTIALLY DECARBOXYLATED TO NIACIN, CONDUCTING A STREAM OF LIQUID REACTION PRODUCTS AWAY FROM SAID ZONE, SEPARATING FROM SAID STREAM A PRODUCTS BY FRACTIONAL CRYSTALLIZATION ISOCINCHOMERONIC ACID AND NIACIN CONTAINED THEREIN AND RETURNING SAID ISOCINCHOMERONIC ACID TO SAID REACTION ZONE AND MAINTAINING THEREIN A SUBSTANTIALLY CONSTANT INVENTORY OF ISOCINCHOMERONIC ACID AND ADDING THERETO FRESH QUANTITIES OF NITRIC ACID.
Claim 2
Dependent Claim
116 words
IN THE MANUFACTURE OF NIACIN FROM 2-METHYL-5-ETHYLPYRIDINE, THE CONTINUOUS PROCESS WHICH COMPRISES THE STEPS OF CONDUCTING A MIXTURE OF 2-MERHYL-5-ETHYL-PYRIDINE, ISOCINCHOMERONIC ACID AND NITRIC ACID TO A REACTION ZONE, MAINTAINING THEREIN A TEMPERATURE NOT SUBSTANTIALLY ABOVE THE RANGE OF 180-185* C. AT WHICH SAID 2-METHYL5-ETHYL-PYRIDINE IS CONVERTED AT LEAST IN PART OF ISOCINCHOMERONIC ACID AND SAID ISOCINOCHOERONIC ACID IS PARTIALLY DECARBOXYLATED TO NIACIN, CONDUCTING A STREAM OF LIQUID REACTION PRODUCTS AWAY FROM SAID ZONE, SEPARATING FROM SAID STREAM A PRODUCTS BY FRACTIONAL CRYSTALLIZATION ISOCINCHOMERONIC ACID AND NIACIN CONTAINED THEREIN AND RETURNING SAID ISOCINCHOMERONIC ACID TO SAID REACTION ZONE AND MAINTAINING THEREIN A SUBSTANTIALLY CONSTANT INVENTORY OF ISOCINCHOMERONIC ACID AND ADDING THERETO FRESH QUANTITIES OF NITRIC ACID.
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) | 1958-05-09 | 1958-11-08 | 1959-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-09 | 1962-11-08 | 1963-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-09 | 1966-11-08 | 1967-05-10 | $7700.00 | Window Closed / Lapsed |