US3982950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic emulsion for use in flash exposure
Assignee: Fujifilm Holdings Corp
•
Filing: 1975-02-04
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Granted: 1976-09-28
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Expires: 1995-02-04
Abstract
Abstract A silver halide photographic emulsion for use in flash exposure, which contains a sensitizing amount of a defined simple merocyanine dye.
Inventors
- 👤 Keisuke Shiba
- 👤 Haruo Takei
- 👤 Akira Sato
- 👤 Akira Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:58
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/28; G03C1/29; G03C1/10; G03C1/12; G03C1/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
126 words
A silver halide photographic emulsion having high sensitivity to flash exposure, consisting essentially of grains of silver halide selected from the group consisting of silver chlorobromide and chlorobromoiodide, the grain size ranging from about 0.04 to about 1 micron, said grains being chemically sensitized with a combination of a gold salt and at least one of the group VIII metal salts or a combination of a gold salt and at least one of the group II metal salts, a protective colloid, and a sensitizing amount of a simple merocyanine dye having the following formula (II), ##SPC8## wherein R 1 and R 2 represent an unsubstituted alkyl group, allyl group, sulfoalkyl group or carboxyalkyl group, said sensitizing dye being the only sensitizing dye present in the emulsion.
Claim 2
Dependent Claim
126 words
A silver halide photographic emulsion having high sensitivity to flash exposure, consisting essentially of grains of silver halide selected from the group consisting of silver chlorobromide and chlorobromoiodide, the grain size ranging from about 0.04 to about 1 micron, said grains being chemically sensitized with a combination of a gold salt and at least one of the group VIII metal salts or a combination of a gold salt and at least one of the group II metal salts, a protective colloid, and a sensitizing amount of a simple merocyanine dye having the following formula (II), ##SPC8## wherein R 1 and R 2 represent an unsubstituted alkyl group, allyl group, sulfoalkyl group or carboxyalkyl group, said sensitizing dye being the only sensitizing dye present in the emulsion.
Claim 3
Dependent Claim
28 words
A silver halide photographic emulsion as claimed in claim 1, wherein the mode size of the silver halide grains contained therein is from 0.8 micron to 0.04 micron.
Claim 4
Dependent Claim
25 words
A silver halide photographic emulsion as claimed in claim 1, wherein the maximum sensitivity wavelength of the emulsion is in the region shorter than 520mμ.
Claim 5
Dependent Claim
12 words
The emulsion of claim 1 wherein the silver halide is silver chlorobromide.
References Cited (Backward Citations)
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US3480439A
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US3672897A
Cited
US3703377A
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US3718476A
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US3790390A
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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) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |