US4039335A
Expired / Lapsed
US
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Photographic silver halide emulsions
Assignee: Fujifilm Holdings Corp
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Filing: 1976-10-29
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Granted: 1977-08-02
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Expires: 1996-10-29
Abstract
Abstract A silver halide photographic emulsion spectrally sensitized with a combination of sensitizing dyes consisting essentially of at least one sensitizing dye represented by the following general formula [I] and at least one sensitizing dye represented by the following general formula [II] in supersensitizing amounts: ##STR1## wherein R 1 and R 2 each is an alkyl group, R 3 is an alkyl group, X 1 is an acidic anion, m is 1 or 2, and m is 1 when the dye forms an intramolecular salt (betaine-like structure). ##STR2## WHEREIN Z 1 is a sulfur atom or a selenium atom, Z 2 is an atomic group necessary to form a benzothiazole ring, a benzoselenazole ring, a naphtho[1,2-d]thiazole ring or a naphtho[1,2-d]selenazole ring, R 4 and R 5 is an alkyl group, R 6 is an alkyl group, a phenyl group, an aralkyl group, a furyl group or a thienyl group, X 2 is an acidic anion, n is 1 or 2, and n is 1 when the dye forms an intramolecular salt (betaine-like structure).
Inventors
- 👤 Masanao Hinata
- 👤 Haruo Takei
- 👤 Akira Sato
- 👤 Atsuo Iwamoto
- 👤 Jun Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:03
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28; G03C1/29
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
173 words
A silver halide photograhic emulsion spectrally sensitized with a combination of sensitizing dyes consisting essentially of at least one sensitizing dye represented by the following general formula [I] and at least one sensitizing dye represented by the following general formula [II] in supersensitizing amounts: ##STR10## wherein R 1 and R 2 each is an alkyl group, R 3 is an alkyl group, X 1 is an acidic anion, m is 1 or 2, and m is 1 when the dye forms an intramolecular salt (betaine-like structure). ##STR11## wherein Z 1 is a sulfur atom or a selenium atom, Z 2 is an atomic group necessary to form a benzothiazole ring, a benzoselenazole ring, a naphtho[1,2-d]thiazole ring or a naphtho[1,2-d]selenazole ring, R 4 and R 5 each is an alkyl group, R 6 is an alkyl group, a phenyl group, an aralkyl group, a furyl group or a thienyl group, X 2 is an acidic anion, n is 1 or 2, and n is 1 when the dye forms an intramolecular salt (betaine-like structure).
Claim 2
Dependent Claim
173 words
A silver halide photograhic emulsion spectrally sensitized with a combination of sensitizing dyes consisting essentially of at least one sensitizing dye represented by the following general formula [I] and at least one sensitizing dye represented by the following general formula [II] in supersensitizing amounts: ##STR10## wherein R 1 and R 2 each is an alkyl group, R 3 is an alkyl group, X 1 is an acidic anion, m is 1 or 2, and m is 1 when the dye forms an intramolecular salt (betaine-like structure). ##STR11## wherein Z 1 is a sulfur atom or a selenium atom, Z 2 is an atomic group necessary to form a benzothiazole ring, a benzoselenazole ring, a naphtho[1,2-d]thiazole ring or a naphtho[1,2-d]selenazole ring, R 4 and R 5 each is an alkyl group, R 6 is an alkyl group, a phenyl group, an aralkyl group, a furyl group or a thienyl group, X 2 is an acidic anion, n is 1 or 2, and n is 1 when the dye forms an intramolecular salt (betaine-like structure).
Claim 3
Dependent Claim
196 words
The supersensitized silver halide photographic emulsion of claim 1 wherein the dye represented by the general formula [I] is represented by the general formula [I'] and the dye represented by the general formula [II] is represented by the general formula [II']: ##STR12## wherein R 3 is an alkyl group, R 11 and R 21 each is an alkyl group and at least one of these is a substituted alkyl group having a sulfo group, a carboxyalkyl group or a hydroxyalkyl group, X 1 is an acidic anion, m is 1 or 2, and m is 1 when the dye forms an intramolecular salt (betaine-like structure). ##STR13## wherein Z 1 is a sulfur atom or a selenium atom, Z 2 is a benzothiazole ring, a benzoselenazole ring or a naphtho[1,2-d]thiazole ring, R 6 has the same meaning as in formula (II), R 41 and R 51 each is an alkyl group and at least one of these is a substituted alkyl group having a sulfo group, a carboxyalkyl group or a hydroxyalkyl group, X 2 is an acidic anion, n is 1 or 2, and n is 1 when the dye forms an intramolecular salt (betaine-like structure).
Claim 4
Dependent Claim
41 words
The supersensitized silver halide photographic emulsion of claim 2 wherein Z 1 in general formula [II'] is a sulfur atom, the ring completed by Z 2 is a naphtho[1,2-d]-thiazole ring and R 6 is a methyl group or an ethyl group.
Claim 5
Dependent Claim
62 words
The supersensitized silver halide photographic emulsion of claim 2 wherein the ring completed by Z 2 in general formula [II'] is a naphtho[1,2-d]thiazole ring, a benzothiazole ring substituted at the 5-position with a methyl group, an ethyl group, a hydroxy group, a methoxy group or an ethoxy group, a benzothiazole ring or a benzoselenazole ring and R 6 is a phenyl group.
Claim 6
Dependent Claim
35 words
The supersensitized silver halide photographic emulsion of claim 2 wherein Z 1 in general formula [II'] is a sulfur atom, a naphtho[1,2-d]thiazole ring is completed by Z 2 and R 6 is a phenyl group.
Claim 7
Dependent Claim
36 words
The supersensitized silver halide photographic emulsion of claim 2 wherein the molar ratio of the sensitizing dye(s) represented by general formula [I'] to the sensitizing dye(s) represented by general formula [II'] is from 10/1 to 1/1.
References Cited (Backward Citations)
US3922170A
Cited
US3932186A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |