Patent US2569237A successfully refreshed from Google Patents.
Patent US3578641A successfully refreshed from Google Patents.
US3578641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous esters of polymeric n-hydroxyimides
Assignee: Monsanto Co
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Filing: 1968-04-01
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Granted: 1971-05-11
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Expires: 1988-04-01
Abstract
Abstract ESTERS OF N-HYDROXY-SUBSTITUTED OLEFIN-MALEIMIDE COPOLYMERS AND N-BLOCKED A-AMINO CARBOXYLIC ACIDS OR PEPTIDES; THE METHOD OF PRODUCING SAID ESTERS; AND USE OF SAID ESTERS IN PEPTIDE SYNTHESIS WHICH COMPRISES CONDENSING THE ESTER WITH AN A-AMINO CARBOXYLIC ACID OR A FIRST PEPTIDE OR AN ESTER OR AMIDE OF SAID ACID OR FIRST PEPTIDE TO OBTAIN A SECOND PEPTIDE AND REGENERATED NHYDROXY-SUBSTITUTED OLEFIN-MALEIMIDE COPOLYMER. ALSO DISCLOSED IS THE REMOVAL OF THE N-BLOCKING FROM THE PEPTIDE ESTERS OF SAID N-HYDROXY-SUBSTITUTED COPOLYMERS AND INTRAMOLECULAR CYCLIZATION OF THE UNBLOCKED ESTER TO GIVE CYCLIC PEPTIDES.
Inventors
- 👤 John H Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:51
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |