Patent US4689286A successfully refreshed from Google Patents.
US4689286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic recording material developable by heat treatment
Assignee: Agfa Gevaert AG
•
Filing: 1986-04-07
•
Granted: 1987-08-25
•
Expires: 2006-04-07
Abstract
Abstract A color photographic recording material developable by heat treatment and comprising at least one binder layer, which contains photosensitive silver halide, optionally a substantially non-photosensitive silver salt and a color providing compound (dye releaser), can be improved in regard to the Dmin/max relation and in regard to sensitivity by addition of a compound corresponding to formula I R.sup.1 --S--CO--O--R.sup.2 in which R 1 and R 2 independently of one another represent alkyl, alkenyl, cycloalkyl, aralkyl or aryl.
Inventors
- 👤 Karl-Wilhelm Schranz
- 👤 Gunther Schenk
- 👤 Hans hlschlager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:25
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/40; G03C8/4013; G03C8/408
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
96 words
A color photographic recording material developable by heat treatment and comprising at least one binder layer which is applied to a layer support and which contains photosensitive silver halide, optionally a substantially non-photosensitive silver salt, at least one non-diffusing color-providing compound which is capable of releasing a diffusible dye in consequence of development by heat treatment and a fog-reducing compound, wherein the fog-reducing compound corresponds to the following formula R.sup.1 --S--CO--O--R.sup.2 I in which R 1 and R 2 may be the same or different and each represent an alkyl, alkenyl, cycloalkyl, aralkyl or aryl group.
Claim 2
Dependent Claim
96 words
A color photographic recording material developable by heat treatment and comprising at least one binder layer which is applied to a layer support and which contains photosensitive silver halide, optionally a substantially non-photosensitive silver salt, at least one non-diffusing color-providing compound which is capable of releasing a diffusible dye in consequence of development by heat treatment and a fog-reducing compound, wherein the fog-reducing compound corresponds to the following formula R.sup.1 --S--CO--O--R.sup.2 I in which R 1 and R 2 may be the same or different and each represent an alkyl, alkenyl, cycloalkyl, aralkyl or aryl group.
Claim 3
Dependent Claim
27 words
A recording material as claimed in claim 1 wherein R 1 in formula I represents an aryl group substituted by halogen, alkyl, alkoxy, acylamino, alkoxycarbonyl and/or sulfamoyl.
Claim 4
Dependent Claim
27 words
A recording material as claimed in claim 1 or claim 2 wherein R 2 represents an alkyl, cycloalkyl or aryl group containing up to 10 carbon atoms.
Claim 5
Dependent Claim
31 words
A recording material as claimed in claim 1 wherein the fog-reducing compound of formula I is present in a quantity of from 0.01 to 0.5 mole per mole of silver salt.
Claim 6
Dependent Claim
28 words
A recording material as claimed in claim 1 wherein the color-providing compound is an oxidizable color-providing compound capable of releasing a diffusible dye as a result of oxidation.
Claim 7
Dependent Claim
42 words
A recording material as claimed in claim 1 wherein the color-providing compound is a reducible color-providing compound capable of releasing a diffusible dye as a result of reduction, and the reducible color-providing compound is used in combination with an electron donor compound.
Claim 8
Dependent Claim
75 words
A recording material as claimed in claim 1 containing three combinations of a photosensitive silver salt and a non-diffusing color-providing compound which is capable of releasing a diffusible dye, the silver halide in each of the three combinations having a different spectral sensitivity and the color-providing compound associated with the silver halide being capable of releasing a dye of which the absorption range substantially coincides with the spectral sensitivity range of the associated silver halide.
Claim 9
Dependent Claim
27 words
A recording material as claimed in claim 7 containing the three combinations in three binder layers arranged one above the other and optionally separated by separating layers.
Claim 10
Dependent Claim
24 words
A recording material as claimed in claim 7 containing the three combinations in the form of separate, complex coacervates in a common binder layer.
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) | 1990-08-24 | 1991-02-23 | 1991-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-24 | 1995-02-23 | 1995-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-24 | 1999-02-23 | 1999-08-25 | $7700.00 | Window Closed / Lapsed |