US3868256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fogged, direct-positive silver halide emulsion containing a cyanine dye having a pyrazole{8 5,1b quinazolone nucleus
Assignee: Fujifilm Holdings Corp
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Filing: 1973-07-16
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Granted: 1975-02-25
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Expires: 1993-07-16
Abstract
Abstract A photographic silver halide emulsion for direct positive use characterized by containing as a novel sensitizing agent at least one cyanine dye in which the 3-position carbon atom of the pyrazolo (5,1-b) quinazolone nucleus and the 1-, 2-, 3- or 4position of the cyanine heterocyclic nucleus thereof are linked with a methine chain (with the proviso that the linking is at the 4-position only when the cyanine heterocyclic nucleus is a quinoline or pyridine nucleus, and the linking is at the 1- or 3positions only when the cyanine heterocyclic nucleus is an isoquinoline). The photographic emulsion containing the above specific dye exhibits high light-sensitivity with less color retention defects.
Inventors
- 👤 Akira Sato
- 👤 Akira Ogawa
- 👤 Keisuke Shiba
- 👤 Masanao Hinata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:37
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/10; C09B23/105; C09B23/107; G; G03; G03C; G03C1/00; G03C1/005; G03C1/485; G03C1/48515; G03C1/48523; G03C1/4853
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A SILVER HALIDE EMULSION FOR DIRECT POSITIVE USE COMPRISING FOGGED SILVER HALIDE GRAINS AND CONTANING AT LEAST ONE CYANINE DYE IN WHICH THE 3-POSITON CARBON ATOM IN THE PYRAZOLE (5, 1-B) QUINAZOLONE NUCLEUS THEREOF AND THE 1-, 2-, 3-, ,OR 4-POSITION OF THE CYANNINE HETEROCYCLIC NUCLEUS THEREOF IS DIRECTLY LINKED BY WAY OF A METHINE CHAIN WITH 2 OR 4 METHANE GROUPS, WITH THE PROVISO THAT THE LINKING AT THE 4POSITION BEING ONLY WHEN THE CYANINE HETEROCYCLIC NUCLEUS IS A QUINOLINE OR A PYRIDINE NUCLEUS, AND THE LINKING AT THE 1- AND A POSITION BEING ONLY WHEN THE CYANINE HETEROCYLIC NUCLEUS IS AN ISOQUINOLINE NUCLEUS.
Claim 2
Dependent Claim
105 words
A SILVER HALIDE EMULSION FOR DIRECT POSITIVE USE COMPRISING FOGGED SILVER HALIDE GRAINS AND CONTANING AT LEAST ONE CYANINE DYE IN WHICH THE 3-POSITON CARBON ATOM IN THE PYRAZOLE (5, 1-B) QUINAZOLONE NUCLEUS THEREOF AND THE 1-, 2-, 3-, ,OR 4-POSITION OF THE CYANNINE HETEROCYCLIC NUCLEUS THEREOF IS DIRECTLY LINKED BY WAY OF A METHINE CHAIN WITH 2 OR 4 METHANE GROUPS, WITH THE PROVISO THAT THE LINKING AT THE 4POSITION BEING ONLY WHEN THE CYANINE HETEROCYCLIC NUCLEUS IS A QUINOLINE OR A PYRIDINE NUCLEUS, AND THE LINKING AT THE 1- AND A POSITION BEING ONLY WHEN THE CYANINE HETEROCYLIC NUCLEUS IS AN ISOQUINOLINE NUCLEUS.
Claim 3
Dependent Claim
24 words
The silver halide emulsion of claim 1, in which pyrazolo(5,1-b) quinazolone nucleus of the dye contains an alkyl group at the 1-or 4-position thereof.
Claim 4
Dependent Claim
35 words
The silver halide emulsion of claim 1, in which the cyanine heterocyclic nucleus is a benzoxalzole nucleus, a benzothiazole nucleus, a benzoselenazole nucleus, an indolenine nucleus, a thiazoline nucleus or an imidazo (4,5-b) quinoxaline nucleus.
Claim 5
Dependent Claim
18 words
The silver halide emulsion of claim 1, in which the silver halide in the emulsion is chemically fogged.
Claim 6
Dependent Claim
22 words
The silver halide emulsion of claim 4, in which the silver halide is fogged with a reducing agent and a gold compound.
Claim 7
Dependent Claim
46 words
The silver halide emulsion of claim 1, in which the silver halide comprises fogged silver halide grains and in which 95% by weight of the silver halide grains have a particle size which is within 40% of the average particle size of the silver halide grain.
Claim 8
Dependent Claim
16 words
The silver halide emulsion of claim 1, in which the emulsion additionally contains an organic densensitizer.
Claim 9
Dependent Claim
21 words
The silver halide emulsion of claim 7, in which the organic desensitizer is a compound represented by the general formula (X):
Claim 10
Dependent Claim
16 words
The silver halide emulsion of claim 1 in which the emulsion additionally contains a photographic coupler.
Claim 11
Dependent Claim
31 words
The silver halide emulsion of claim 1 in which the cyanine dye is selected from at least one of the group those represented by the general formulae (I), (II) and (III):
Claim 12
Dependent Claim
21 words
A silver halide photographic material for direct positive use comprising a support having thereon the silver halide emulsion of claim 1.
References Cited (Backward Citations)
US3758309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |