Patent US4315070A successfully refreshed from Google Patents.
US4315070A
Expired / Lapsed
US
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Color-photographic recording material containing a highly reactive dir-coupler
Assignee: Agfa Gevaert AG
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Filing: 1980-06-12
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Granted: 1982-02-09
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Expires: 2000-06-12
Abstract
Abstract In high sensitivity color photographic recording materials the undesired color fog density is reduced by highly reactive DIR-compounds having an effective reaction velocity constant k eff of more than 20,000 [1 . mole -1 . sec -1 ] (measured at pH 10.2 by the method described hereinafter) in a concentration of from 10 -5 to 10 -3 mole per mole of silver halide, if contained in a light-sensitive silver halide emulsion layer or in a concentration of from 10 -7 to 10 -5 mole per gram of solids if contained in a silver-halide-free binder layer adjacent to a silver halide emulsion layer.
Inventors
- 👤 Erwin Ranz
- 👤 Joachim W. Lohmann
- 👤 Heinz-Dieter Schutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:16
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
In a color photographic recording material comprising at least three differently spectrally sensitized light sensitive silver halide emulsion layer units which have non-diffusing color couplers associated therewith, and non-light-sensitive binder layers, the improvement according to which in at least one of the light-sensitive and light-insensitive layers of the recording material is associated with a DIR coupler compound corresponding to the following formula: ##STR12## said DIR coupler having an effective reaction velocity constant k eff of more than 20,000 (mole -1 .sec -1 .) in a concentration of from 10 -5 to 10 -3 mole per mole of silver halide in the same layer or in a concentration of from 10 -7 to 10 -5 mole per gram of solids in the case of a silver-halide-free binder layer adjacent to a silver halide emulsion layer.
Claim 2
Dependent Claim
134 words
In a color photographic recording material comprising at least three differently spectrally sensitized light sensitive silver halide emulsion layer units which have non-diffusing color couplers associated therewith, and non-light-sensitive binder layers, the improvement according to which in at least one of the light-sensitive and light-insensitive layers of the recording material is associated with a DIR coupler compound corresponding to the following formula: ##STR12## said DIR coupler having an effective reaction velocity constant k eff of more than 20,000 (mole -1 .sec -1 .) in a concentration of from 10 -5 to 10 -3 mole per mole of silver halide in the same layer or in a concentration of from 10 -7 to 10 -5 mole per gram of solids in the case of a silver-halide-free binder layer adjacent to a silver halide emulsion layer.
Claim 3
Dependent Claim
33 words
The recording material as claimed in claim 1, in which the DIR coupler used is a DIR coupler which forms, on coupling with the color developer oxidation products, only substantially colorless reaction products.
Claim 4
Dependent Claim
37 words
The recording material as claimed in claim 1 in which the DIR coupler having the specified effective reaction velocity constant k eff of more than 20,000 l.mole -1 .sec -1 is contained in the yellow filter layer.
References Cited (Backward Citations)
US3958993A
Cited
DE2448063A1
Cited
US4046574A
Cited
US4052213A
Cited
US4088491A
Cited
DE2707489A1
Cited
DE2709688A1
Cited
US4133687A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-02-08 | 1985-08-10 | 1986-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-02-08 | 1989-08-10 | 1990-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-02-08 | 1993-08-10 | 1994-02-09 | $7700.00 | Window Closed / Lapsed |