Patent US3156976A successfully refreshed from Google Patents.
US3004004A
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Hydrophilic polypeptides and their preparation
Assignee: Eastman Kodak Co
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Filing: 1958-03-26
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Granted: 1961-10-10
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Expires: 1978-03-26
Abstract
No abstract record available.
Inventors
- 👤 Charles J Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:50
CPC Classifications
C; C07; C07K; C07K1/00; C07K1/12; C07K1/122; G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
51 words
A PROCESS FOR PREPARING A HYDROPHILIC POLYPEPTIDE WHICH COMPRISES DISSOLVING A HIGH MOLECULAR WEIGHT POLYY-BENZYL-L-GLUTAMIC ACID, HAVING AN INTRINSIC VISCOSITY IN DIOXAN OF AT LEAST 0.42, IN DISCHLORACETIC ACID AND TREATING THE SOLUTION THUS OBTAINED WITH ANHYDROUS HYDROGEN BROMIDE UNDER COOL CONDITIONS UNTIL THE DEBENZYLATED POLYPEPTIDE IS SOLUBLE IN DILUTE ALKALI.
Claim 2
Dependent Claim
51 words
A PROCESS FOR PREPARING A HYDROPHILIC POLYPEPTIDE WHICH COMPRISES DISSOLVING A HIGH MOLECULAR WEIGHT POLYY-BENZYL-L-GLUTAMIC ACID, HAVING AN INTRINSIC VISCOSITY IN DIOXAN OF AT LEAST 0.42, IN DISCHLORACETIC ACID AND TREATING THE SOLUTION THUS OBTAINED WITH ANHYDROUS HYDROGEN BROMIDE UNDER COOL CONDITIONS UNTIL THE DEBENZYLATED POLYPEPTIDE IS SOLUBLE IN DILUTE ALKALI.
References Cited (Backward Citations)
US2630423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |