US3579587A
Expired / Lapsed
US
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Process for the preparation of the dextrorotatory 2,2' - (ethylene-di-imino)-di-1-butanol
Assignee: LABORATORIO CHIMICO FARMACEUTICO GIORGIO ZOJA SpA
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Filing: 1968-11-13
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Granted: 1971-05-18
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Expires: 1988-11-13
Abstract
Abstract A PROCESS FOR THE PRODUCTION OF PURE (+)2,2''-(ETHYLENEDIIMINO)-DI-1-BUTANOL DIHYDROCHLORIDE FORMED BY REACTING A SOLUTION OF (+)2-AMINO-1-BUTANOL AND (-)2AMINO-1-BUTANOL WITH (+)TARTARIC ACID, SEPARATING THE DIASTEREOSOMERS BY FRACTIONAL CRYSTALLIZATION USING BOILING METHYL ALCOHOL AND REACTIING THE HIGHLY PURE (+)2-AMINO1-BUTANOL(+)HYDROGEN TARTARATE WITH ETHYLENE DICHLORIDE IN THE PRESENCE OF AN INERT ORGANIC SOLVENT AND A CALCIUM COMPOUND, CONCENTRATING THE REACTION SOLUTION, REMOVING INSOLUBLE CALCIUM SLATS AND SATURATING WITH GASEOUS HC1 TO PRECIPITATE (+)2,2''-(ETHYLENEDIIMINO)-DI-1-BUTANOL DIHYDROCHLORIDE.
Inventors
- 👤 Giorgio Zoja
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:00
CPC Classifications
C; C07; C07C; C07C215/00; C07C215/02; C07C215/04; C07C215/06; C07C215/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |