US2824123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of dicarboxylic acids
Assignee: CP Hall Co
•
Filing: 1956-02-17
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Granted: 1958-02-18
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Expires: 1976-02-17
Abstract
No abstract record available.
Inventors
- 👤 Vincent P Kuceski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:12
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
THE PROCESS OF OBTAINING AN ALPHA, OMEGA-ALKANEDIOIC ACID ESTER OF HIGH PURITY FROM A MIXTURE CONTAINING ADJACENT HOMOLOGS OF SUCH ACIDS EACH CONTAINING 2 TO 10 CARBON ATOMS, WHICH PROCESS COMPRISES ESTERIFYING THE MIXTURE WITH METHANOL, DISTILLING THE RESULTING DIETERS AND COLLECTING A FRACTION WHICH IS ESSENTIALLY A BINARY MIXTURE OF TWO ADJACENT ESTER HOMOLOGS, AND THEN CRYSTALLIZING ONE OF THE TWO ESTER HOMOLOGS FROM A LIQUID SYSTEM CONTAINING THIS BINARY MIXTURE BY COOLING THE SYSTEM TO A TEMPERATURE JUST ABOVE THE TEMPERATURE AT WHICH A EUTECTIC MIXTURE OF THE TWO ESTER HOMOLOGS CRYSTALLIZES FROM THE SYSTEM, AND THEREBY OBTAINING ONE OF THE ESTERS.
Claim 2
Dependent Claim
104 words
THE PROCESS OF OBTAINING AN ALPHA, OMEGA-ALKANEDIOIC ACID ESTER OF HIGH PURITY FROM A MIXTURE CONTAINING ADJACENT HOMOLOGS OF SUCH ACIDS EACH CONTAINING 2 TO 10 CARBON ATOMS, WHICH PROCESS COMPRISES ESTERIFYING THE MIXTURE WITH METHANOL, DISTILLING THE RESULTING DIETERS AND COLLECTING A FRACTION WHICH IS ESSENTIALLY A BINARY MIXTURE OF TWO ADJACENT ESTER HOMOLOGS, AND THEN CRYSTALLIZING ONE OF THE TWO ESTER HOMOLOGS FROM A LIQUID SYSTEM CONTAINING THIS BINARY MIXTURE BY COOLING THE SYSTEM TO A TEMPERATURE JUST ABOVE THE TEMPERATURE AT WHICH A EUTECTIC MIXTURE OF THE TWO ESTER HOMOLOGS CRYSTALLIZES FROM THE SYSTEM, AND THEREBY OBTAINING ONE OF THE ESTERS.
References Cited (Backward Citations)
US2269998A
Cited
US2560156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-17 | 1961-08-19 | 1962-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-17 | 1965-08-19 | 1966-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-17 | 1969-08-19 | 1970-02-18 | $7700.00 | Window Closed / Lapsed |