Patent US2429673A successfully refreshed from Google Patents.
Patent US2904538A successfully refreshed from Google Patents.
US2904538A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polypeptides
Assignee: Monsanto Chemicals Ltd
•
Filing: 1958-06-02
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Granted: 1959-09-15
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Expires: 1978-06-02
Abstract
No abstract record available.
Inventors
- 👤 Van R Gaertner
- 👤 George A Richardson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:43
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/08; C08G69/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF PREPARING POLYPEPTIDES, WHICH METHOD COMPRISES HEATING AN N-(S-ARYLDITHIOCARBOXY) AMINO ACID IN WHICH THE AMINO GROUP IS ATTACHED TO A CARBON ATOM WHICH IS (1) ADJACENT TO A CARBONYL GROUP AND (2) SELECTED FROM THE GROUP CONSISTING OF ASYNMETRIC CARBON ATOMS AND TERTIARY CARBON ATOMS IN THE PRESENCE OF AN ORGANIC TERTIARY NITROGEEN BASE CATALYST.
Claim 2
Independent Claim
57 words
THE METHOD OF PREPARING POLYPEPTIDES, WHICH METHOD COMPRISES HEATING AN N-(S-ARYLDITHIOCARBOXY) AMINO ACID IN WHICH THE AMINO GROUP IS ATTACHED TO A CARBON ATOM WHICH IS (1) ADJACENT TO A CARBONYL GROUP AND (2) SELECTED FROM THE GROUP CONSISTING OF ASYNMETRIC CARBON ATOMS AND TERTIARY CARBON ATOMS IN THE PRESENCE OF AN ORGANIC TERTIARY NITROGEEN BASE CATALYST.
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |