Patent US3116332A successfully refreshed from Google Patents.
US3116332A
Expired / Lapsed
US
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Resolution of racemic aminoisopropanol
Assignee: EIDP Inc
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Filing: 1958-10-17
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Granted: 1963-12-31
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Expires: 1978-10-17
Abstract
No abstract record available.
Inventors
- 👤 Robert H Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:43
CPC Classifications
C; C07; C07C; C07C215/00; C07C215/02; C07C215/04; C07C215/06; C07C215/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A MEHTOD FOR THE RESOLUTION OF RACEMIC ISOPROPANOLAMINE WHICH COMPRISES REACTING L(+)-TARTATIC ACID WITH THE RACEMIC ISOPROPANOLAMINE AND WATER IN AN AQUEOUS SOLUTION CONTAINING AT LEAST TWO MOLES OF WATER PER MOLE OF RACEMATE AT A TEMPERATURE BELOW THE BOILING POINT OF SAID SOLUTION, CRYSTALLIZING L(+)-ISOPROPANOLAMINE HYDROGEN L(+)-TARTRATE DIHYDRATE FROM THE RESULTING AQUEOUS SOLUTION OF THE DIASTEREOISOMERS OF ISOPROPANOLAMINE HYDROGEN TARTRATE DIHYDRATE, SAID AQUEOUS SOLUTION DURING SAID CRYSTALLIZATION BEING AT A TEMPERATURE BELOW THE MELTING POINT OF AND SUPERSATURATED WITH RESPECT TO SAID L(+)-ISOPROPANOLAMINE HYDROGEN L(+)-TARTRATE DIHYDRATE, AND REACTING SAID L(+)-ISOPROPANOLAMINE HYDROGRAN L(+)-TARTRATE DIHYDRATE WITH AN ALKALINE EARTH HYDROXIDE TO YIELD L (+)-ISOPROPANOLAMINE.
Claim 2
Dependent Claim
103 words
A MEHTOD FOR THE RESOLUTION OF RACEMIC ISOPROPANOLAMINE WHICH COMPRISES REACTING L(+)-TARTATIC ACID WITH THE RACEMIC ISOPROPANOLAMINE AND WATER IN AN AQUEOUS SOLUTION CONTAINING AT LEAST TWO MOLES OF WATER PER MOLE OF RACEMATE AT A TEMPERATURE BELOW THE BOILING POINT OF SAID SOLUTION, CRYSTALLIZING L(+)-ISOPROPANOLAMINE HYDROGEN L(+)-TARTRATE DIHYDRATE FROM THE RESULTING AQUEOUS SOLUTION OF THE DIASTEREOISOMERS OF ISOPROPANOLAMINE HYDROGEN TARTRATE DIHYDRATE, SAID AQUEOUS SOLUTION DURING SAID CRYSTALLIZATION BEING AT A TEMPERATURE BELOW THE MELTING POINT OF AND SUPERSATURATED WITH RESPECT TO SAID L(+)-ISOPROPANOLAMINE HYDROGEN L(+)-TARTRATE DIHYDRATE, AND REACTING SAID L(+)-ISOPROPANOLAMINE HYDROGRAN L(+)-TARTRATE DIHYDRATE WITH AN ALKALINE EARTH HYDROXIDE TO YIELD L (+)-ISOPROPANOLAMINE.
References Cited (Backward Citations)
US2646445A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-30 | 1967-07-01 | 1967-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-30 | 1971-07-01 | 1971-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-30 | 1975-07-01 | 1975-12-31 | $7700.00 | Window Closed / Lapsed |