Patent US3765897A successfully refreshed from Google Patents.
US3765897A
Expired / Lapsed
US
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Process of incorporating additives into photographic emulsions
Assignee: Agfa Gevaert AG
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Filing: 1971-10-07
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Granted: 1973-10-16
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Expires: 1991-10-07
Abstract
Abstract The emulsification of additives into a photographic emulsion is stabilized by combining the additive with mono aryl esters or mono cycloalkyl esters of a succinic acid that has a long chained aliphatic substituent.
Inventors
- 👤 F Nittel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:54
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/388; G03C7/3885; G03C1/00; G03C1/005; G03C1/06; G03C1/38
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
The combination of claim 1 in which the binder is gelatin and the material to be emulsified is first dissolved in a volatile water-immisicible short chain aliphatic solvent along with the oil former, and the solution thus formed is emulsified into the gelatin emulsion.
Claim 2
Dependent Claim
13 words
The combination of claim 2 in which the organic solvent is methylene chloride.
Claim 3
Dependent Claim
13 words
The combination of claim 2 in which the organic solvent is diethyl carbonate.
Claim 4
Dependent Claim
43 words
The combination of claim 1 in which the binder is gelatin, the material to be emulsified is soluble in aqueous alkali, and is dissolved in an aqueous alkaline solution along with the oil former and the resulting solution emulsified into the gelatin emulsion.
Claim 5
Dependent Claim
29 words
In a photographic gelatin emulsion containing emulsified photographic additive particles and an oil former that stabilizes the emulsion, the improvement according to which the oil former has the formula:
Claim 6
Dependent Claim
16 words
The combination of claim 6 in which R'' is substituted with another radical of the formula:
Claim 7
Dependent Claim
14 words
The combination of claim 6 in which the photographic additive is a color coupler.
Claim 8
Dependent Claim
14 words
The combination of claim 6 in which the photographic additive is a UV absorber.
Claim 9
Dependent Claim
14 words
The combination of claim 6 in which the photographic additive is a white toner.
References Cited (Backward Citations)
US3689271A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |