US2725293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsion compositions and their preparation
Assignee: Eastman Kodak Co
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Filing: 1952-04-01
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Granted: 1955-11-29
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Expires: 1972-04-01
Abstract
No abstract record available.
Inventors
- 👤 Ralph H Talbot
- 👤 Thomas J Mccleary
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:42
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A METHOD OF PRAPARING PHOTGRAPHIC PRODUCTS HAVING A SILVER HALLIDE EMULSION LAYER WHICH INCLUDES THE STEPS OF PREPARING SILVER HALIDE IN A DISPERSING AGENT THEREOF, FORMING THEREFROM A SILVER HALIDE PHOTOGRAPHIC EMULSION IN WHICH THE SILVER HALIDE IS DISPERSED IN AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT SELECTED FROM THE AMMONIUM, ALKALI METAL AND AMINE SALTS OF THE PHTHALIC, SUCCINIC AND MALEIC ACID ESTERS OF ETHYL CELLULOSE HAVING AN ALKOXY CONTENT OF AT LEAS 42% WHICH ESTER HAS A DICARBOXYLIC ACID RADICAL CONTENT OF AT LEAST 5%, COATING THE EMULSION THUS PREPARED ONTO A SUPPORT THEREFOR AND IMMEDIATELY THEREAFTER APPLYING TO THE EMULSION LAYER WARM AIR HAVING A WET BULB TEMPERATURE OF AT LEAST THE SETTING TEMPERATURE OF THE ETHYL CELLULOSE ESTER SALT UNTIL SETTING OF THE EMULSION LAYER IS OBTAINED AND CONTAINING THE APPLICATION OF THE WARM AIR TO THE EMULSION LAYER UNTIL THE LAYER HAS DRIED.
Claim 2
Independent Claim
148 words
A METHOD OF PRAPARING PHOTGRAPHIC PRODUCTS HAVING A SILVER HALLIDE EMULSION LAYER WHICH INCLUDES THE STEPS OF PREPARING SILVER HALIDE IN A DISPERSING AGENT THEREOF, FORMING THEREFROM A SILVER HALIDE PHOTOGRAPHIC EMULSION IN WHICH THE SILVER HALIDE IS DISPERSED IN AN AQUEOUS SOLUTION OF A WATER-SOLUBLE SALT SELECTED FROM THE AMMONIUM, ALKALI METAL AND AMINE SALTS OF THE PHTHALIC, SUCCINIC AND MALEIC ACID ESTERS OF ETHYL CELLULOSE HAVING AN ALKOXY CONTENT OF AT LEAS 42% WHICH ESTER HAS A DICARBOXYLIC ACID RADICAL CONTENT OF AT LEAST 5%, COATING THE EMULSION THUS PREPARED ONTO A SUPPORT THEREFOR AND IMMEDIATELY THEREAFTER APPLYING TO THE EMULSION LAYER WARM AIR HAVING A WET BULB TEMPERATURE OF AT LEAST THE SETTING TEMPERATURE OF THE ETHYL CELLULOSE ESTER SALT UNTIL SETTING OF THE EMULSION LAYER IS OBTAINED AND CONTAINING THE APPLICATION OF THE WARM AIR TO THE EMULSION LAYER UNTIL THE LAYER HAS DRIED.
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) | 1958-11-28 | 1959-05-30 | 1959-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-28 | 1963-05-30 | 1963-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-28 | 1967-05-30 | 1967-11-29 | $7700.00 | Window Closed / Lapsed |