US2578672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Picolinic acid recovery
Assignee: Beazer East Inc
•
Filing: 1945-11-23
•
Granted: 1951-12-18
•
Expires: 1965-11-23
Abstract
No abstract record available.
Inventors
- 👤 Corson Ben Bennett
- 👤 Gordon S Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:28
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN A PROCESS FOR RECOVERING WATER-SOLUBLE PYRIDINE CARBOXYLIC ACID FROM AN AQUEOUS SOLUTION CONTAINING WATER-SOLUBLE INORGANIC CONTAMINANTS, THE STEPS OF SETTING SAID SOLUTION AT THE ISOELECTRIC POINT, DISTILLING OFF THE WATER, SIMULTANEOUSLY EXTRACTING SAID SOLUTION WITH A SOLVENT FOR PYRIDINE CARBOXYLIC ACID WHICH IS SUBSTANTIALLY NONSOLVENT FOR SAID INORGANIC CONTAMINANTS AND HAS A BOILING POINT ABOVE THAT AT WHICH WATER IS DISTILLED, SEPARATING THE SOLUTION THUS OBTAINED FROM THE INORGANIC CONTAMINANTS, AND RECOVERING PYRIDINE CARBOXYLIC ACID FROM THE SOLVENT.
Claim 2
Dependent Claim
79 words
IN A PROCESS FOR RECOVERING WATER-SOLUBLE PYRIDINE CARBOXYLIC ACID FROM AN AQUEOUS SOLUTION CONTAINING WATER-SOLUBLE INORGANIC CONTAMINANTS, THE STEPS OF SETTING SAID SOLUTION AT THE ISOELECTRIC POINT, DISTILLING OFF THE WATER, SIMULTANEOUSLY EXTRACTING SAID SOLUTION WITH A SOLVENT FOR PYRIDINE CARBOXYLIC ACID WHICH IS SUBSTANTIALLY NONSOLVENT FOR SAID INORGANIC CONTAMINANTS AND HAS A BOILING POINT ABOVE THAT AT WHICH WATER IS DISTILLED, SEPARATING THE SOLUTION THUS OBTAINED FROM THE INORGANIC CONTAMINANTS, AND RECOVERING PYRIDINE CARBOXYLIC ACID FROM THE SOLVENT.
References Cited (Backward Citations)
US2288281A
Cited
US2347410A
Cited
US2436660A
Cited
US2476004A
Cited
US2405223A
Cited
US2449906A
Cited
US2517276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |