US2766286A
Expired / Lapsed
US
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Process for the resolution of racemic threo-1-phenyl-2-amino-1. 3-propanediol
Assignee: Gruppo Lepetit SpA
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Filing: 1954-07-13
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Granted: 1956-10-09
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Expires: 1974-07-13
Abstract
No abstract record available.
Inventors
- 👤 D Amato Vitangelo
- 👤 Pagani Renzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
44 words
A PROCESS FOR PREPARING LAEVOROTATORY THREO-1-PHENYL-2-AMINO-1,3-PROPANEDIOL, WHICH COMPRISES DISSOLVING RACEMIC THREO-1-PHENYL-2-AMINO-1,3-PROPANEDIOL IN ETHYL ALCOHOL, ADDING TO THE SOLUTION ONE EQUIVALENT OF D-GLUTAMIC ACID, SEPARATING THE INSOLUBLE MATERIAL, EVAPORATING THE FILTERED ETHYL ALCOHOL SOLUTION TO DRYNESS IN VACUO, AND RECRYSTALLIZING THE OBTAINED RESIDUE FROM CHLOROFORM.
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) | 1959-10-09 | 1960-04-09 | 1960-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-09 | 1964-04-09 | 1964-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-09 | 1968-04-09 | 1968-10-09 | $7700.00 | Window Closed / Lapsed |