Patent US2768079A successfully refreshed from Google Patents.
US2768079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing washed photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1954-01-25
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Granted: 1956-10-23
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Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:42
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
IN A PROCESS OF PREPARING A WASHED WILVER HALIDE DISPERSION THE STEPS WHICH COMPRISE PREPARING A DISPERSION OF SILVER HALIDE IN AN AQUEOUS SOLUTION OF A GELATIN DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF THE AROMATIC SULFONYL CHLORIDE DERIVATIVES OF GELATIN, THE CARBOXYLIC ACID CHLORIDE DERIVATIVES OF GELATIN, THE CARBOXYLIC ACID ANHYDRIDE DERIVATIVES OF GELATIN AND THE AROMATIC ISOCYANATE DERIVATIVES OF GELATIN, COAGULATING THAT DISPERSION WHILE AT A PH OF 4.5-10 BY ADDING THERETO 1/2-20 GRAMS, PER MOLE OF SILVER HALIDE, OF A WATER SOLUBLE SALT SELECTED FROM THE WATER SOLUBLE SALTS OF CADMIUM, ZINC, ALUMINUN, IRON, NICKEL, CHROMIUM AND LANTHANUM WHEREBY SILVER HALIDE-GELATIN GRANULES FORM AND SEPARATING THOSE GRANULES FROM THE LIQUID PORTION OF THE MASS.
Claim 2
Dependent Claim
117 words
IN A PROCESS OF PREPARING A WASHED WILVER HALIDE DISPERSION THE STEPS WHICH COMPRISE PREPARING A DISPERSION OF SILVER HALIDE IN AN AQUEOUS SOLUTION OF A GELATIN DERIVATIVE SELECTED FROM THE GROUP CONSISTING OF THE AROMATIC SULFONYL CHLORIDE DERIVATIVES OF GELATIN, THE CARBOXYLIC ACID CHLORIDE DERIVATIVES OF GELATIN, THE CARBOXYLIC ACID ANHYDRIDE DERIVATIVES OF GELATIN AND THE AROMATIC ISOCYANATE DERIVATIVES OF GELATIN, COAGULATING THAT DISPERSION WHILE AT A PH OF 4.5-10 BY ADDING THERETO 1/2-20 GRAMS, PER MOLE OF SILVER HALIDE, OF A WATER SOLUBLE SALT SELECTED FROM THE WATER SOLUBLE SALTS OF CADMIUM, ZINC, ALUMINUN, IRON, NICKEL, CHROMIUM AND LANTHANUM WHEREBY SILVER HALIDE-GELATIN GRANULES FORM AND SEPARATING THOSE GRANULES FROM THE LIQUID PORTION OF THE MASS.
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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |