Patent US2923691A successfully refreshed from Google Patents.
US2923691A
Expired / Lapsed
US
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Process of reacting protein with isocy-
Assignee: —
•
Filing: —
•
Granted: 1960-02-02
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Expires: 1977-02-02
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08H; C08H1/00; C08H1/06; C08L; C08L89/00; C09; C09J; C09J189/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A PROTEINYL UREA-ALDEHYDE COPOLYMER PREPARED BY REACTING FROM ABOUT .1% TO ABOUT 1.2% OF AN ALDEHYDE, BASED ON THE WEIGHT OF THE PROTEIN SOLIDS, WITH A PROTEINYL UREA AT A PH OF AT LEAST ABOUT 5, SAID PROTEINYL UREA BEING FORMED BY TREATING A PROTEIN WITH ISOCYANIC ACID WHEREBY THE FREE AMINO GROUPS OF SAID PROTEIN ARE CONVERTED TO FREE CARBAMIDO GROUPS.
Claim 2
Dependent Claim
62 words
A PROTEINYL UREA-ALDEHYDE COPOLYMER PREPARED BY REACTING FROM ABOUT .1% TO ABOUT 1.2% OF AN ALDEHYDE, BASED ON THE WEIGHT OF THE PROTEIN SOLIDS, WITH A PROTEINYL UREA AT A PH OF AT LEAST ABOUT 5, SAID PROTEINYL UREA BEING FORMED BY TREATING A PROTEIN WITH ISOCYANIC ACID WHEREBY THE FREE AMINO GROUPS OF SAID PROTEIN ARE CONVERTED TO FREE CARBAMIDO GROUPS.
References Cited (Backward Citations)
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Cited
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Cited
US2332519A
Cited
US2381063A
Cited
US2512672A
Cited
US2606123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-01 | 1963-08-03 | 1964-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-01 | 1967-08-03 | 1968-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-01 | 1971-08-03 | 1972-02-02 | $7700.00 | Window Closed / Lapsed |