US2512585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic distillation of isopropyl alcohol from diisopropylamine
Assignee: Commercial Solvents Corp
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Filing: 1946-02-25
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Granted: 1950-06-20
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Expires: 1966-02-25
Abstract
No abstract record available.
Inventors
- 👤 Smith Everet Foy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:03
CPC Classifications
C; C07; C07C; C07C29/00; C07C29/74; C07C29/76; C07C29/80; C07C29/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS FOR SEPARATING DISOPROPYLAMINE FROM MIXTURES CONTAINING DIISOPROPYLAMINE AND ISOPROPYL ALCOHOL WHICH COMPRISES ADDING TO THE SAID MIXTURES AN INERT ORGANIC LIQUID CAPABLE OF FORMING AN AXEOTROPE WITH ISOPROPYL ALCOHOL BOILING SUBSTANTIALLY BELOW THE BOILING POINTS OF THE INERT ORGANIC LIQUID, ISOPROPYL ALCOHOL, DISOPROPYLAMINE, ADN THE ISOPROPYL ALCOHOL-DIISOPROPYLAMINE AZEOTROPE, FRACTIONALLY DISTILLING AND SEPARATING AN AZEOTROPE COMPRISING ISOPROPYL ALCOHOL AND THE INERT ORGANIC LIQUID, REMOVING THE RESIDUAL INERT ORGANIC LIQUID, AND FRACTIONALLY DISTILLING THE DIISOPROPYLAMINE.
Claim 2
Dependent Claim
75 words
A PROCESS FOR SEPARATING DISOPROPYLAMINE FROM MIXTURES CONTAINING DIISOPROPYLAMINE AND ISOPROPYL ALCOHOL WHICH COMPRISES ADDING TO THE SAID MIXTURES AN INERT ORGANIC LIQUID CAPABLE OF FORMING AN AXEOTROPE WITH ISOPROPYL ALCOHOL BOILING SUBSTANTIALLY BELOW THE BOILING POINTS OF THE INERT ORGANIC LIQUID, ISOPROPYL ALCOHOL, DISOPROPYLAMINE, ADN THE ISOPROPYL ALCOHOL-DIISOPROPYLAMINE AZEOTROPE, FRACTIONALLY DISTILLING AND SEPARATING AN AZEOTROPE COMPRISING ISOPROPYL ALCOHOL AND THE INERT ORGANIC LIQUID, REMOVING THE RESIDUAL INERT ORGANIC LIQUID, AND FRACTIONALLY DISTILLING THE DIISOPROPYLAMINE.
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) | 1953-06-19 | 1953-12-19 | 1954-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-19 | 1957-12-19 | 1958-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-19 | 1961-12-19 | 1962-06-20 | $7700.00 | Window Closed / Lapsed |