US4788133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic recording material
Assignee: Agfa Gevaert AG
•
Filing: 1987-02-17
•
Granted: 1988-11-29
•
Expires: 2007-02-17
Abstract
Abstract A recording material having improved sharpness and color reproduction contains as uppermost layer a green-sensitive silver chloride emulsion having a layered grain structure, the ratio of diameter to thickness of the silver halide grains being at most 5.
Inventors
- 👤 Wolfgang Sauerteig
- 👤 Gunter Renner
- 👤 Sieghart Klotzer
- 👤 Jens-Peter Grimm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:34
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A color photographic recording material comprising at least two blue-sensitive, at least two green-sensitive and at least two red-sensitive silver halide emulsion layers and associated coupler, wherein the improvement comprises the absence of a blue light absorbing filter layer and a green-sensitive silver halide emulsion layer arranged in such a way that, on exposure, it is closest of all the photosensitive silver halide emulsion layers to the subject to be photographed and contains a silver halide of which at least 50 mole-% consists of silver chloride, have a layered grain structure and show a crystal form in which the ratio of diameter to thickness is at most 5.
Claim 2
Dependent Claim
108 words
A color photographic recording material comprising at least two blue-sensitive, at least two green-sensitive and at least two red-sensitive silver halide emulsion layers and associated coupler, wherein the improvement comprises the absence of a blue light absorbing filter layer and a green-sensitive silver halide emulsion layer arranged in such a way that, on exposure, it is closest of all the photosensitive silver halide emulsion layers to the subject to be photographed and contains a silver halide of which at least 50 mole-% consists of silver chloride, have a layered grain structure and show a crystal form in which the ratio of diameter to thickness is at most 5.
Claim 3
Dependent Claim
97 words
A color photographic recording material as claimed in claim 1, characterized in that the green-sensitive layer contains a color coupler corresponding to the following general formula ##STR35## in which R 1 is a hydrogen atom or a group releasable during the coupling reaction, R 2 is hydrogen or a substituent of the type normally encountered in magenta couplers and A and B are the same or different and represent an optionally substituted methine group or =N-- or --NH--, in addition to which A and B may be part of an optionally fused ring, particularly an aromatic ring.
Claim 4
Dependent Claim
31 words
A color photographic recording material as claimed in claims 1 or 2, characterized in that at least 70% of the silver halide emulsion in the green-sensitive layer consists of silver chloride.
Claim 5
Dependent Claim
78 words
A color photographic recording material as claimed in claims 1 or 2, characterized in that the green-sensitive layer contains a silver halide emulsion of which the grains have a layered grain structure of at least two regions differing in their halide composition, the grains being characterized in that at least 60 mole % of the halide is chloride and at least one region B contains at least 10 mole %, but less than 50 mole % silver bromide.
Claim 6
Dependent Claim
74 words
A color photographic recording material as claimed in claims 1 or 2, characterized in that the silver halide emulsion in the green-sensitive layer consists essentially of grains which comprise a zone Z Br , at least 60 mole % of the halide being chloride, the bromide content in the zone Z Br being at least 50 mole % and no bromide-rich zone Z Br being present at the surface of the silver halide grains.
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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |