US2515593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pyridine-carboxylic acids
Assignee: Shell Development Co
•
Filing: 1948-01-30
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Granted: 1950-07-18
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Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Engel Willem Frederik
- 👤 Hoog Han
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:39
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
101 words
THE PROCESS FOR THE PRODUCTION OF NICOTINIC ACID WHICH COMPRISES HEATING AN ADMIXTURE OF 3-ETHYLPYRIDINE HYDROCHLORIDE, CHLORINE AND WATER AT A TEMPERATURE OF ABOUT 115*C., THEREBY CONVERTING SAID ADMIXTURE TO REACTION PRODUCTS COMPRISING NICOTINIC AND UNCONVERTED 3-METHYLPYRIDINE HYDROCHLORIDE, CONTINUING SAID HEATING UNTIL A CONVERSION OF 3-METHYLPYRIDINE HYDROCHLORIDE TO NICOTINIC ACID OF ABOUT 14% HAS BEEN OBTAINED, THEREAFTER SEPARATING NICOTINIC ACID FROM SAID REACTION PRODUCTS, AND FURTHER HEATING SAID REMAINING REACTION PRODUCTS IN THE PRESENCE OF ADDED CHLORINE AT A TEMPERATURE OF ABOUT 115*C., THEREBY EFFECTING THE FURTHER CONVERSION OF AT LEAST SUBSTANTIAL AMOUNT OF SAID UNCONVERTED 3-METHYLPYRIDINE HYDROCHLORIDE TO NICOTINE ACID.
Claim 2
Dependent Claim
101 words
THE PROCESS FOR THE PRODUCTION OF NICOTINIC ACID WHICH COMPRISES HEATING AN ADMIXTURE OF 3-ETHYLPYRIDINE HYDROCHLORIDE, CHLORINE AND WATER AT A TEMPERATURE OF ABOUT 115*C., THEREBY CONVERTING SAID ADMIXTURE TO REACTION PRODUCTS COMPRISING NICOTINIC AND UNCONVERTED 3-METHYLPYRIDINE HYDROCHLORIDE, CONTINUING SAID HEATING UNTIL A CONVERSION OF 3-METHYLPYRIDINE HYDROCHLORIDE TO NICOTINIC ACID OF ABOUT 14% HAS BEEN OBTAINED, THEREAFTER SEPARATING NICOTINIC ACID FROM SAID REACTION PRODUCTS, AND FURTHER HEATING SAID REMAINING REACTION PRODUCTS IN THE PRESENCE OF ADDED CHLORINE AT A TEMPERATURE OF ABOUT 115*C., THEREBY EFFECTING THE FURTHER CONVERSION OF AT LEAST SUBSTANTIAL AMOUNT OF SAID UNCONVERTED 3-METHYLPYRIDINE HYDROCHLORIDE TO NICOTINE ACID.
References Cited (Backward Citations)
US2437938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |