Patent US4705747A successfully refreshed from Google Patents.
US4705747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic recording material containing a silver halide emulsion and a process for its production
Assignee: Agfa Gevaert AG
•
Filing: 1986-02-24
•
Granted: 1987-11-10
•
Expires: 2006-02-24
Abstract
Abstract Improved silver halide emulsions are obtained by the combined use of an iridium compound and an imidazole before termination of crystal growth.
Inventors
- 👤 Sieghart Klotzer
- 👤 Bruno Mucke
- 👤 Gunther Mahlberg
- 👤 Manfred Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:52
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/015; G03C2200/00; G03C2200/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A color photographic recording material containing color couplers and comprising at least one photosensitive silver halide emulsion layer and, optionally, other layers on a layer support, characterized in that the silver halide emulsion contains silver halide crystals with at least 20 mole-% of silver chloride and at most 80 mole-% of silver bromide of which the crystal formation and/or crystal growth were carried out in the presence of an iridium compound and an imidazole corresponding to the following formula ##STR2## in which R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen and/or an optionally substituted alkyl, alkenyl, aryl or aralkyl group.
Claim 2
Dependent Claim
112 words
A color photographic recording material containing color couplers and comprising at least one photosensitive silver halide emulsion layer and, optionally, other layers on a layer support, characterized in that the silver halide emulsion contains silver halide crystals with at least 20 mole-% of silver chloride and at most 80 mole-% of silver bromide of which the crystal formation and/or crystal growth were carried out in the presence of an iridium compound and an imidazole corresponding to the following formula ##STR2## in which R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen and/or an optionally substituted alkyl, alkenyl, aryl or aralkyl group.
Claim 3
Dependent Claim
23 words
A color photographic recording material as claimed in claim 1, characterized in that the iridium compound and the imidazole were used during precipitation.
Claim 4
Dependent Claim
20 words
A color photographic recording material as claimed in claim 1, characterized in that the iridium compound is a water-soluble compound.
Claim 5
Dependent Claim
19 words
A color photographic recording material as claimed in claim 1, characterized in that the iridium compound is a hexachloroiridate.
Claim 6
Dependent Claim
39 words
A color photographic recording material as claimed in claim 1, characterized in that the imidazole is selected from the following group: imidazole, 1-methyl imidazole, 2-methyl imidazole, 1,2-dimethyl imidazole, 1-allyl imidazole, 1-methoxymethyl imidazole, 1-(2-carboxyethyl)-imidazole, 4-(or 5-) methyl imidazole, 2-ethyl-4-methyl imidazole.
Claim 7
Dependent Claim
111 words
A color photographic paper containing color couplers and comprisng at least one photosensitive silver halide emulsion layer and, optionally, other layers on a layer support, characterized in that the silver halide emulsion contains silver halide crystals with at least 20 mole-% of silver chloride and at most 80 mole-% of silver bromide of which the crystal formation and/or crystal growth were carried out in the presence of an iridium compound and an imidazole corresponding to the following formula: ##STR3## in which R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen and/or an optionally substituted alkyl, alkenyl, aryl or aralkyl group.
Claim 8
Dependent Claim
111 words
A color photographic paper containing color couplers and comprisng at least one photosensitive silver halide emulsion layer and, optionally, other layers on a layer support, characterized in that the silver halide emulsion contains silver halide crystals with at least 20 mole-% of silver chloride and at most 80 mole-% of silver bromide of which the crystal formation and/or crystal growth were carried out in the presence of an iridium compound and an imidazole corresponding to the following formula: ##STR3## in which R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen and/or an optionally substituted alkyl, alkenyl, aryl or aralkyl group.
Claim 9
Dependent Claim
90 words
A process for the preparation of a photographic silver halide emulsion, characterized in that the silver halide crystals with at least 20 mole-% of silver chloride and at most 80 mole-% of silver bromide were prepared in the presence of an iridium compound and an imidazole corresponding to the following formula ##STR4## in which R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen and/or an optionally substituted alkyl, alkenyl, aryl or aralkyl group before the termination of crystal growth.
Claim 10
Dependent Claim
90 words
A process for the preparation of a photographic silver halide emulsion, characterized in that the silver halide crystals with at least 20 mole-% of silver chloride and at most 80 mole-% of silver bromide were prepared in the presence of an iridium compound and an imidazole corresponding to the following formula ##STR4## in which R 1 , R 2 , R 3 and R 4 may be the same or different and represent hydrogen and/or an optionally substituted alkyl, alkenyl, aryl or aralkyl group before the termination of crystal growth.
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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |