Patent US4571378A successfully refreshed from Google Patents.
US4571378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic recording material and development process
Assignee: Agfa Gevaert AG
•
Filing: 1984-12-10
•
Granted: 1986-02-18
•
Expires: 2004-12-10
Abstract
Abstract Improved photographic recording materials containing at least one silver halide emulsion layer with comparatively high sensitivity and at least one silver halide emulsion layer with comparatively low sensitivity. Color couplers and DIR compounds of differing reactivities are associated with these layers.
Inventors
- 👤 Wolfgang Sauerteig
- 👤 Erwin Ranz
- 👤 Heinz Schutz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:47
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/32; G03C7/3225; G03C7/3003; G03C1/00; G03C1/005; G03C1/035; G03C2001/03511; G03C2001/03517; G03C7/305; G03C7/30541; Y; Y10; Y10S; Y10S430/00; Y10S430/156; Y10S430/158
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
179 words
Photographic recording material having at least one more sensitive silver halide emulsion layer (I) and one comparatively less sensitive silver halide emulsion layer (II), both being sensitive to the same spectral region, layers (I) and (II) having DIR compounds of differing reactivities and colour couplers associated therewith, wherein the ratio of the effective reaction velocity constant of the colour coupler to the effective reaction velocity constant of the DIR compound is higher in layer (I) than in layer (II) and wherein the sensitive silver halide emulsion layer (I) contains at least one DIR compound corresponding to the following general formula: ##STR11## wherein R 1 represents an unsubstituted or substituted hydrocarbyl group; Y represents S or NR 2 wherein R 2 represents hydrogen, an unsubstituted or substituted hydrocarbyl group, a heterocyclic group attached through a ring carbon atom or an electron-attracting substituent; and X represents an aliphatic group, an aromatic group or a heterocyclic group which, when split off with the sulphur atom of the thioether bridge, forms a diffusible mercapto compound which inhibits the development of the silver halide.
Claim 2
Dependent Claim
179 words
Photographic recording material having at least one more sensitive silver halide emulsion layer (I) and one comparatively less sensitive silver halide emulsion layer (II), both being sensitive to the same spectral region, layers (I) and (II) having DIR compounds of differing reactivities and colour couplers associated therewith, wherein the ratio of the effective reaction velocity constant of the colour coupler to the effective reaction velocity constant of the DIR compound is higher in layer (I) than in layer (II) and wherein the sensitive silver halide emulsion layer (I) contains at least one DIR compound corresponding to the following general formula: ##STR11## wherein R 1 represents an unsubstituted or substituted hydrocarbyl group; Y represents S or NR 2 wherein R 2 represents hydrogen, an unsubstituted or substituted hydrocarbyl group, a heterocyclic group attached through a ring carbon atom or an electron-attracting substituent; and X represents an aliphatic group, an aromatic group or a heterocyclic group which, when split off with the sulphur atom of the thioether bridge, forms a diffusible mercapto compound which inhibits the development of the silver halide.
Claim 3
Dependent Claim
25 words
Photographic recording material according to claim 1, characterised in that the ratio of effective reaction velocity constants in layer (I) is from 2:1 to 20:1.
Claim 4
Dependent Claim
26 words
Photographic colour recording material according to claim 1, characterised in that the ratio of effective reaction velocity constants in layer (II) is from 0.03:1 to 6:1.
Claim 5
Dependent Claim
29 words
Photographic colour recording material according to claim 1, characterised in that the coupler and DIR compound are contained in the silver halide emulsion layer with which they are associated.
Claim 6
Dependent Claim
103 words
Process for the production of a photographic image by development of an exposed recording material having at least one comparatively sensitive silver halide emulsion layer (I) and a comparatively less sensitive silver halide emulsion layer (II), both being sensitive in the same region of the spectrum, characterised in that colour couplers and DIR compounds are associated with layers (I) and (II) in the process of development, the ratio of the effective reaction velocity constants of the colour coupler and of the DIR compound in association with layer (I) is greater than that of the colour coupler and DIR compound associated with layer (II).
Claim 7
Dependent Claim
103 words
Process for the production of a photographic image by development of an exposed recording material having at least one comparatively sensitive silver halide emulsion layer (I) and a comparatively less sensitive silver halide emulsion layer (II), both being sensitive in the same region of the spectrum, characterised in that colour couplers and DIR compounds are associated with layers (I) and (II) in the process of development, the ratio of the effective reaction velocity constants of the colour coupler and of the DIR compound in association with layer (I) is greater than that of the colour coupler and DIR compound associated with layer (II).
Claim 8
Dependent Claim
22 words
Process according to claim 5, characterised in that at least one colour coupler is contained in the colour developer used for development.
Claim 9
Dependent Claim
49 words
Process according to claim 5, characterised in that the ratio of the effective reaction velocity constants of colour coupler and DIR compound associated with layer (I) is from 2:1 to 20:1 and that of the colour coupler and DIR compound associated with layer (II) is from 0.03:1 to 6:1.
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) | 1989-02-17 | 1989-08-19 | 1990-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-17 | 1993-08-19 | 1994-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-17 | 1997-08-19 | 1998-02-18 | $7700.00 | Window Closed / Lapsed |