US3003879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonaqueous photographic emulsions
Assignee: Eastman Kodak Co
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Filing: 1959-01-08
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Granted: 1961-10-10
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Expires: 1979-01-08
Abstract
No abstract record available.
Inventors
- 👤 William J Priest
- 👤 Ernest J Perry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:18
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A METHOD OF MAKING NONAQUEOUS PHOTOGRAPHIC EMULSIONS WHICH COMPRISES REACTING SILVER NITRATE AND WATER SOLUBLE HALIDE IN AN AQUEOUS SOLUTION OF A PEPTIZER SELECTED FROM THE GROUP CONSISTING OF THE WATER SOLUBLE SALTS OF CARBOXYLATED POLYVINYL ACETALS CONTAINING 60-87 MOLE PERCENT POLYVINYL ACETAL AND AT LEAST 4 AND NOT MORE THAN 40 MOLE PERCENT OF CARBOXYL, AND THE WATER SOLUBLE SALTS OF CARBOXYLATED POLYVINYL BUTYRALS CONTAINING 50-75 MOLE PRECENT POLYVINYL BUTYRAL, THE MINIMUM CARBOXYL CONTENT BEING WITHIN THE RANGE OF 4-17 MOLE PERCENT AND THE MAXIMUM CARBOXYL CONTENT BEING 100 MOLE PERCENT MINUS THE MOLE PERCENT OF POLYVINYL BUTYRAL CONTAINED THEREIN, COAGULATING THE DISPERSION THUS FORMED BY ADJUSTING THE PH TO A VALUE WITHIN THE RANGE OF 3-4.5, SEPARATING THE SILVER HALIDE COAGULUM AND DRYING, FOLLOWED BY DISPERSING THE COAGULUM IN A SOLUTION OF THE FREE ACID FORM OF THE POLYVINYL COMPOUND IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIOXANE, ISOPROPANOL, DIMETHOXYETHANE AND ACETONE, WHEREBY A SILVER HALIDE PHOTOGRAPHIC EMULSION COMPOSITION IS OBTAINED.
Claim 2
Independent Claim
165 words
A METHOD OF MAKING NONAQUEOUS PHOTOGRAPHIC EMULSIONS WHICH COMPRISES REACTING SILVER NITRATE AND WATER SOLUBLE HALIDE IN AN AQUEOUS SOLUTION OF A PEPTIZER SELECTED FROM THE GROUP CONSISTING OF THE WATER SOLUBLE SALTS OF CARBOXYLATED POLYVINYL ACETALS CONTAINING 60-87 MOLE PERCENT POLYVINYL ACETAL AND AT LEAST 4 AND NOT MORE THAN 40 MOLE PERCENT OF CARBOXYL, AND THE WATER SOLUBLE SALTS OF CARBOXYLATED POLYVINYL BUTYRALS CONTAINING 50-75 MOLE PRECENT POLYVINYL BUTYRAL, THE MINIMUM CARBOXYL CONTENT BEING WITHIN THE RANGE OF 4-17 MOLE PERCENT AND THE MAXIMUM CARBOXYL CONTENT BEING 100 MOLE PERCENT MINUS THE MOLE PERCENT OF POLYVINYL BUTYRAL CONTAINED THEREIN, COAGULATING THE DISPERSION THUS FORMED BY ADJUSTING THE PH TO A VALUE WITHIN THE RANGE OF 3-4.5, SEPARATING THE SILVER HALIDE COAGULUM AND DRYING, FOLLOWED BY DISPERSING THE COAGULUM IN A SOLUTION OF THE FREE ACID FORM OF THE POLYVINYL COMPOUND IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF DIOXANE, ISOPROPANOL, DIMETHOXYETHANE AND ACETONE, WHEREBY A SILVER HALIDE PHOTOGRAPHIC EMULSION COMPOSITION IS OBTAINED.
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) | 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 |