Patent US2852519A successfully refreshed from Google Patents.
US2852519A
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Method for producing esters of heterocyclic nitrogen carboxylic acids
Assignee: Phillips Petroleum Co
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Filing: 1954-12-27
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Granted: 1958-09-16
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Expires: 1974-12-27
Abstract
No abstract record available.
Inventors
- 👤 Carl W Kruse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:10
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/79; C07D213/803; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
THE IMPROVEMENT IN THE PROCESS OF PRODUCING ESTERS OF ORGANIC HETEROCYCLIC NITROGEN CONTAINING ACIDS SELECTED FROM THE GROUP CONSISTING OF PYRIDINE AND QUINOLINE CAR BOXYLIC ACIDS BY REACTING A HETEROCYCLIC NITROGEN CONTAINING ACID HAVING AT LEAST ONE ALPHA-CARBOXY GROUP WITH AN ALCOHOL IN THE PRESENCE OF A MINERAL ACID, SAID IMPROVEMENT COMPRISING RECOVERING THE FREE ESTER OF THE ORGANIC ACID BY MIXING THE RESULTING REACTION PRODUCT IN AN EXCESS OF A MEDIUM CONSISTING ESSENTIALLY OF WATER.
Claim 2
Dependent Claim
76 words
THE IMPROVEMENT IN THE PROCESS OF PRODUCING ESTERS OF ORGANIC HETEROCYCLIC NITROGEN CONTAINING ACIDS SELECTED FROM THE GROUP CONSISTING OF PYRIDINE AND QUINOLINE CAR BOXYLIC ACIDS BY REACTING A HETEROCYCLIC NITROGEN CONTAINING ACID HAVING AT LEAST ONE ALPHA-CARBOXY GROUP WITH AN ALCOHOL IN THE PRESENCE OF A MINERAL ACID, SAID IMPROVEMENT COMPRISING RECOVERING THE FREE ESTER OF THE ORGANIC ACID BY MIXING THE RESULTING REACTION PRODUCT IN AN EXCESS OF A MEDIUM CONSISTING ESSENTIALLY OF WATER.
References Cited (Backward Citations)
US2738352A
Cited
GB563171A
Cited
US2505948A
Cited
US2431463A
Cited
US2485152A
Cited
US2758999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |