US3000741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silver halide emulsions
Assignee: Gevaert Photo Producten NV
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Filing: 1959-05-27
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Granted: 1961-09-19
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Expires: 1979-05-27
Abstract
No abstract record available.
Inventors
- 👤 Pauw Alfons Jozef De
- 👤 Hart Rene Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:45
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A METHOD OF FORMING A PHOTOGRAPHIC SILVER HALIDE EMULSION, WHICH COMPRISES MIXING TOGETHER A WATERSOULBLE SILVER SALT AND A WATER-SOULBLE INORGANIC HALIDE IN A DILUTE AQUEOUS SOLUTION OF A MONO-ESTER RESULTING FROM THE ESTERIFICATION OF POLYVINYL ALCOHOL AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC DICARBOXYLIC ACID, A HYDROXY-SUBSTITUTED ALIPHATIC DICARBOXYLIC ACID, AN AROMATIC DICARBOXYLIC ACID AND A TRIBASIC CARBOXYLIC ACID, THE HYDROXYL GROUPS OF POLYVINYL ALCOHOL BEING ESTERFIED FOR 0.5% TO 15% OF THE TOTAL AMOUNT OF THE HEDROXYL GROUPS PRESENT, RIPENING THE SILVER HALIDE DISPERSION IN SAID AQUEOUS SOLUTION, FREEING THE SILVER HALIDE DISPERSION FROM THE WATER-SOLUBLE BY-PRODUCT SALTS, AND ADDING TO THE SILVER HALIDE DEPERSION A LAYER-FORMING DINDING AGENT THEREOF, SAID LAYER-FORMING BINDING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF GELATIN POLYVINYL ALCOHOL AND SAID MONO-ESTER.
Claim 2
Independent Claim
133 words
A METHOD OF FORMING A PHOTOGRAPHIC SILVER HALIDE EMULSION, WHICH COMPRISES MIXING TOGETHER A WATERSOULBLE SILVER SALT AND A WATER-SOULBLE INORGANIC HALIDE IN A DILUTE AQUEOUS SOLUTION OF A MONO-ESTER RESULTING FROM THE ESTERIFICATION OF POLYVINYL ALCOHOL AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF AN ALIPHATIC DICARBOXYLIC ACID, A HYDROXY-SUBSTITUTED ALIPHATIC DICARBOXYLIC ACID, AN AROMATIC DICARBOXYLIC ACID AND A TRIBASIC CARBOXYLIC ACID, THE HYDROXYL GROUPS OF POLYVINYL ALCOHOL BEING ESTERFIED FOR 0.5% TO 15% OF THE TOTAL AMOUNT OF THE HEDROXYL GROUPS PRESENT, RIPENING THE SILVER HALIDE DISPERSION IN SAID AQUEOUS SOLUTION, FREEING THE SILVER HALIDE DISPERSION FROM THE WATER-SOLUBLE BY-PRODUCT SALTS, AND ADDING TO THE SILVER HALIDE DEPERSION A LAYER-FORMING DINDING AGENT THEREOF, SAID LAYER-FORMING BINDING AGENT BEING SELECTED FROM THE GROUP CONSISTING OF GELATIN POLYVINYL ALCOHOL AND SAID MONO-ESTER.
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) | 1964-09-18 | 1965-03-20 | 1965-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-09-18 | 1969-03-20 | 1969-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-09-18 | 1973-03-20 | 1973-09-19 | $7700.00 | Window Closed / Lapsed |