Patent FR705570A successfully refreshed from Google Patents.
Patent US2518666A successfully refreshed from Google Patents.
US2518666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing gelatin derivatives
Assignee: Eastman Kodak Co
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Filing: 1947-08-13
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Granted: 1950-08-15
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Expires: 1967-08-13
Abstract
No abstract record available.
Inventors
- 👤 Rudolph E Damschroder
- 👤 Jr John W Gates
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A METHOD OF PREPARING PROTEIN DERIVATIVES WHICH COMPRISES MIXING A PROTEIN AND A REACTANT THEREFOR SELECTED FROM THE GROUP CONSISTING OF ACID ANHYDRIDES OF THE CARBOXYLIC AND SULFONYL ACIDS, ACID CHLORIDES OF THE CARBOXYLIC AND SULFONYL ACIDS, ISOCYANATES, ISOTHIOCYANATES, AND NITRILES OF UNSATURATED HYDROCARBONS IN FORMAMIDE CONTAINING LESS THAN 10% OF WATER AS THE REACTION MEDIUM FOR A TIME SUFFICIENT TO CAUSE REACTION BETWEEN THE PROTEIN AND THE REACTANT.
Claim 2
Independent Claim
69 words
A METHOD OF PREPARING PROTEIN DERIVATIVES WHICH COMPRISES MIXING A PROTEIN AND A REACTANT THEREFOR SELECTED FROM THE GROUP CONSISTING OF ACID ANHYDRIDES OF THE CARBOXYLIC AND SULFONYL ACIDS, ACID CHLORIDES OF THE CARBOXYLIC AND SULFONYL ACIDS, ISOCYANATES, ISOTHIOCYANATES, AND NITRILES OF UNSATURATED HYDROCARBONS IN FORMAMIDE CONTAINING LESS THAN 10% OF WATER AS THE REACTION MEDIUM FOR A TIME SUFFICIENT TO CAUSE REACTION BETWEEN THE PROTEIN AND THE REACTANT.
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) | 1953-08-14 | 1954-02-13 | 1954-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-14 | 1958-02-13 | 1958-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-14 | 1962-02-13 | 1962-08-15 | $7700.00 | Window Closed / Lapsed |