US3955979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flash exposure of supersensitized silver halide photographic light-sensitive material
Assignee: Fujifilm Holdings Corp
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Filing: 1975-03-24
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Granted: 1976-05-11
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Expires: 1995-03-24
Abstract
Abstract A silver halide photographic light-sensitive element suitable for exposure to light for a period of time of less than (preferably) 0.0001 second comprising a support bearing thereon at least one layer of a silver halide photographic emulsion, the silver halide photographic emulsion containing at least one sensitizing dye represented by the following General Formula (I) in combination with at least one sensitizing dye represented by the following General Formula (II):
Inventors
- 👤 Keisuke Shiba
- 👤 Masanao Hinata
- 👤 Hirotetu Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:18
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28; G03C1/29
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
In a method of producing an image comprising exposing a silver halide photographic light sensitive element comprising a support bearing thereon at least one layer of a silver halide photographic emulsion to light for a period of less than 0.0001 seconds, the improvement which comprises incorporating into the emulsion at least one sensitizing dye represented by the following General Formula (I) in combination with at least one sensitizing dye represented by the following General Formula (II): ##SPC9## wherein R 1 and R 2 each represents an alkyl group, at least one of R 1 and R 2 being an alkyl group having a sulfo substituent, ##SPC10## wherein R B represents a methyl group or an ethyl group, R 3 and R 4 have the same meaning as R 1 and R 2 , at least one of R 3 and R 4 being an alkyl group having a sulfo substituent.
Claim 2
Dependent Claim
150 words
In a method of producing an image comprising exposing a silver halide photographic light sensitive element comprising a support bearing thereon at least one layer of a silver halide photographic emulsion to light for a period of less than 0.0001 seconds, the improvement which comprises incorporating into the emulsion at least one sensitizing dye represented by the following General Formula (I) in combination with at least one sensitizing dye represented by the following General Formula (II): ##SPC9## wherein R 1 and R 2 each represents an alkyl group, at least one of R 1 and R 2 being an alkyl group having a sulfo substituent, ##SPC10## wherein R B represents a methyl group or an ethyl group, R 3 and R 4 have the same meaning as R 1 and R 2 , at least one of R 3 and R 4 being an alkyl group having a sulfo substituent.
Claim 3
Dependent Claim
14 words
The image producing method of claim 1, wherein R B represents an ethyl group.
Claim 4
Dependent Claim
102 words
The image producing method of claim 2, wherein the silver halide photographic emulsion further contains at least one sensitizing dye represented by the following General Formula ##SPC11## in which Y is a hydrogen atom, a hydroxy group, a lower alkyl group, an alkoxy group, or a halogen atom; Z 4 is a non-metallic atomic group required for completing a benzothiazole ring, a benzoselenazole ring, or a 2-quinolin ring; R 5 and R 6 have the same meaning as R 1 and R 2 , respectively, at least one of R 5 and R 6 being an alkyl group having a sulfo substituent.
Claim 5
Dependent Claim
39 words
The image producing method of claim 2, wherein the dye of the General Formula (I) is selected from the group consisting of ##SPC12## and the dye of the General Formula (II) is selected from the group consisting of ##SPC13##
Claim 6
Dependent Claim
22 words
The image producing method of claim 2, wherein the silver halide photographic emulsion further contains at least one pseudo cyanine sensitizing dye.
Claim 7
Dependent Claim
23 words
The image producing method of claim 3, wherein the dye represented by General Formula (III) is selected from the group consisting of ##SPC14##
Claim 8
Dependent Claim
42 words
The image producing method of claim 2, wherein the silver halide photographic emulsion further contains at least one member selected from the group consisting of a compound of a metal of group VIII of the Periodic Table and a compound of gold.
References Cited (Backward Citations)
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Cited
US3617293A
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US3660099A
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US3667960A
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US3890154A
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US3808008A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |