Patent US2991307A successfully refreshed from Google Patents.
US2991307A
Expired / Lapsed
US
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Process of resolving nu, nu-dibenzyl-dl-alpha-amino acids and products
Assignee: Sanofi Aventis France
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Filing: 1955-11-30
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Granted: 1961-07-04
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Expires: 1975-11-30
Abstract
No abstract record available.
Inventors
- 👤 Amiard Gaston
- 👤 Heymes Rene
- 👤 Velluz Leon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:30
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/487; C07B; C07B57/00; C07C227/00; C07C227/30; C07C227/34; C07C229/00; C07C229/02; C07C229/04; C07C229/06; C07C229/08; C07C229/34; C07C229/36; C07B2200/00; C07B2200/07
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
27 words
IN A PROCESS OF RESOLVING N,N-DIBENZYL-DL-A-AMINO ACIDS, THE STEPS COMPRISING ADDING AN OPTICALLY ACTIVE THREO-1-P-NITRO PHENYL-2-AMINO PROPANE-1,3-DIOL TO A SOLUTION OF THE N,N-DIBENZYL-DL-A-AMINO ACID OF THE FORMULA
Claim 2
Dependent Claim
27 words
IN A PROCESS OF RESOLVING N,N-DIBENZYL-DL-A-AMINO ACIDS, THE STEPS COMPRISING ADDING AN OPTICALLY ACTIVE THREO-1-P-NITRO PHENYL-2-AMINO PROPANE-1,3-DIOL TO A SOLUTION OF THE N,N-DIBENZYL-DL-A-AMINO ACID OF THE FORMULA
Claim 3
Dependent Claim
19 words
THE SALTSS OF AN OPTICALLY ACTIVE THREO-1-P-NITRO PHENYL-2-AMINNO PROPANE -1,3-DIOL AND AN OPTICALLY ACTIVE N,N-DIBENZYL-A-AMINO ACID OF THE FORMULA
Claim 4
Dependent Claim
19 words
THE SALTSS OF AN OPTICALLY ACTIVE THREO-1-P-NITRO PHENYL-2-AMINNO PROPANE -1,3-DIOL AND AN OPTICALLY ACTIVE N,N-DIBENZYL-A-AMINO ACID OF THE FORMULA
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |