Patent EP0273589A1 successfully refreshed from Google Patents.
Patent US2921959A successfully refreshed from Google Patents.
US2921959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of resolving dl-serine
Assignee: Sanofi Aventis France
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Filing: 1955-05-03
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Granted: 1960-01-19
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Expires: 1975-05-03
Abstract
No abstract record available.
Inventors
- 👤 Amiard Gaston
- 👤 Velluz Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:25
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07C227/00; C07C227/30; C07C227/34; C07B; C07B2200/00; C07B2200/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
IN A PROCESS OF RESOLVING DL-SERINE, THE STEP COMPRISING ADDING A SUBSTANTIALLY SEMIMOLECULAR AMOUNT OF L(+)-THREO-1-(P-NITRO PHENY)-2-AMINO PROPANE-1,3-DIOL AT ELEVATED TEMPERATURE NOT SUBSTANTIALLY EXCEEDING ABOUT 100*C. TO A SOLUTION OF N-3,5-DINITRO BENZOYL-DL-SERINE IN A SOLVENT WHEREIN THE SALT OF N-3,5-DINITRO BENZOYL-LSERINE WITH SAID L(+)-THREO-L-(P-NITRO PHENYL)-2-AMINO PROPANE-1,3-DIOL IS SUBSTANTIALLY INSOLUBLE, COOLING THE RESULTING SOLUTION TO CRYSTALLIZATION TEMPERATURE, SEPARATING THE PRECIPITATED SALT OF N-3,5-DINITRO BENZOYL-L-SERINE WITH SAID L(+)-THREO-U-(P-NITRO PHENYL)-2-AMINO PROPANE-1,3DIOL FROM THE MOTHER LIQUOR, CONVERTIONG SAID PRECIPITATED SALT BY REACTION WITH AN ALKALINE AGENT INTO THE ALKALI METAL SALT OF SAID N-3,5-DINITRO BENZOYL-L-SERINE, ACIDIFYING SAID ALKALI METAL SALT, AND HYDROLYZING THE RESULTING N-3,5-DINITRO BENZOYL-L-SERINE TO THE CORRESPONDING LSERINE.
Claim 2
Dependent Claim
106 words
IN A PROCESS OF RESOLVING DL-SERINE, THE STEP COMPRISING ADDING A SUBSTANTIALLY SEMIMOLECULAR AMOUNT OF L(+)-THREO-1-(P-NITRO PHENY)-2-AMINO PROPANE-1,3-DIOL AT ELEVATED TEMPERATURE NOT SUBSTANTIALLY EXCEEDING ABOUT 100*C. TO A SOLUTION OF N-3,5-DINITRO BENZOYL-DL-SERINE IN A SOLVENT WHEREIN THE SALT OF N-3,5-DINITRO BENZOYL-LSERINE WITH SAID L(+)-THREO-L-(P-NITRO PHENYL)-2-AMINO PROPANE-1,3-DIOL IS SUBSTANTIALLY INSOLUBLE, COOLING THE RESULTING SOLUTION TO CRYSTALLIZATION TEMPERATURE, SEPARATING THE PRECIPITATED SALT OF N-3,5-DINITRO BENZOYL-L-SERINE WITH SAID L(+)-THREO-U-(P-NITRO PHENYL)-2-AMINO PROPANE-1,3DIOL FROM THE MOTHER LIQUOR, CONVERTIONG SAID PRECIPITATED SALT BY REACTION WITH AN ALKALINE AGENT INTO THE ALKALI METAL SALT OF SAID N-3,5-DINITRO BENZOYL-L-SERINE, ACIDIFYING SAID ALKALI METAL SALT, AND HYDROLYZING THE RESULTING N-3,5-DINITRO BENZOYL-L-SERINE TO THE CORRESPONDING LSERINE.
References Cited (Backward Citations)
US2514377A
Cited
GB707903A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |