US3767412A
Expired / Lapsed
US
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Polymeric colour couplers and their use in colour photography
Assignee: Agfa Gevaert NV
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Filing: 1971-11-09
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Granted: 1973-10-23
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Expires: 1991-11-09
Abstract
Abstract WHEREIN : Z is hydrogen or C1-C4 alkyl, Y is hydrogen or halogen and R is alkoxycarbonyl, alkylcarbamoyl or an aliphatic aromatic or heterocyclic carboxylic acid or sulphonic acid acyl group. These colour couplers have no effect on the viscosity of the emulsions, show no crystallization tendency and yield upon colour development dye images with high stability against heat and humidity. Polymeric colour couplers for use in photographic silver halide colour emulsions are described which comprise recurring units of the formula :
Inventors
- 👤 J Priem
- 👤 M Monbaliu
- 👤 Den Bergh A Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:59
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/327; G03C7/3275
Claims Analysis
Total Claims: 4
Claim 2
Dependent Claim
33 words
An element according to claim 1 wherein in the said formula R stands for -X-R1 wherein X is carbonyl or sulphonyl and R1 is an alkyl group, an aryl group or a heterocycle.
Claim 3
Dependent Claim
33 words
An element according to claim 1 wherein said emulsion layer is the red-sensitized silver halide emulsion layer of a multilayer colour element comprising three silver halide emulsion layers which are differently optically sensitized.
Claim 4
Dependent Claim
91 words
Process for the production of a photographic colour image by development of a photographic element containing imagewise exposed silver halide with the aid of a developing agent, which by reduction of the exposed silver halide is converted into its oxidized form and as such forms a cyan dye by reaction with at least one polymeric compound which is present in a silver halide containing layer or another colloid layer in water-permeable relationship therewith of the said photographic element and which comprises a homo-polymer or co-polymer having recurring units of the formula:
Claim 5
Dependent Claim
32 words
Process according to claim 4, wherein in the said formula R stands for -X-R1 wherein X is carbonyl or sulphonyl and R1 is an alkyl group, an aryl group or a heterocycle.
References Cited (Backward Citations)
US2852381A
Cited
US3551157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |