US4806461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsion and photographic light-sensitive material using tabular grains having ten or more dislocations per grain
Assignee: Fujifilm Holdings Corp
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Filing: 1988-03-07
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Granted: 1989-02-21
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Expires: 2008-03-07
Abstract
Abstract A silver halide emulsion comprises a dispersion medium and silver halide grains, the silver halide emulsion containing tabular silver halide grains having a thickness of less than 0.5 μm, a diameter of 0.3 μm or more, and a mean diameter-to-thickness ratio of 2 or more. The tabular grains occupy at least 50% of a projected area of all the silver halide grains, and 50% or more (number) of the tabular grains include 10 or more dislocations per grain. A photographic light-sensitive material comprises the aforementioned silver halide emulsion.
Inventors
- 👤 Hideo Ikeda
- 👤 Munehisa Fujita
- 👤 Shingo Ishimaru
- 👤 Hiroshi Ayato
- 👤 Shigeharu Urabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:11
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/0051; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
A silver halide emulsion comprising a dispersion medium and silver halide grains, the silver halide emulsion containing tabular silver halide grains having a thickness of 0.5 μm or less, a diameter of 0.3 μm or more, and a mean diameter-to-thickness ratio of 2 or more, wherein said tabular grains occupy at least 50% of a projected area of all the silver halide grains, and 50% (number) or more of said tabular grains include 10 or more dislocations per grain.
Claim 2
Dependent Claim
79 words
A silver halide emulsion comprising a dispersion medium and silver halide grains, the silver halide emulsion containing tabular silver halide grains having a thickness of 0.5 μm or less, a diameter of 0.3 μm or more, and a mean diameter-to-thickness ratio of 2 or more, wherein said tabular grains occupy at least 50% of a projected area of all the silver halide grains, and 50% (number) or more of said tabular grains include 10 or more dislocations per grain.
Claim 3
Dependent Claim
31 words
The emulsion as in claim 1, wherein the tabular grain has an inner region portion having a higher silver iodide content than that of a surface region of the tabular grain.
Claim 4
Dependent Claim
102 words
A photographic light-sensitive material comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide emulsion layer contains a silver halide emulsion comprising a dispersion medium and silver halide grains, the silver halide emulsion containing tabular silver halide grains having a thickness of 0.5 μm or less, a diameter of 0.3 μm or more, and a mean diameter-to-thickness ratio of 2 or more, wherein said tabular grains occupy at least 50% of a projected area of all the silver halide grains, and 50% (number) or more of said tabular grains include 10 or more dislocations per grain.
Claim 5
Dependent Claim
102 words
A photographic light-sensitive material comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide emulsion layer contains a silver halide emulsion comprising a dispersion medium and silver halide grains, the silver halide emulsion containing tabular silver halide grains having a thickness of 0.5 μm or less, a diameter of 0.3 μm or more, and a mean diameter-to-thickness ratio of 2 or more, wherein said tabular grains occupy at least 50% of a projected area of all the silver halide grains, and 50% (number) or more of said tabular grains include 10 or more dislocations per grain.
Claim 6
Dependent Claim
31 words
The material as in claim 3, wherein the tabular grain has an inner region portion having a higher silver iodide content than that of a surface region of the tabular grain.
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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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |