Patent US4758713A successfully refreshed from Google Patents.
Patent US5268262A successfully refreshed from Google Patents.
US5268262A
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Silver halide photographic material
Assignee: Fujifilm Holdings Corp
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Filing: 1992-10-01
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Granted: 1993-12-07
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Expires: 2012-10-01
Abstract
Abstract A silver halide photographic material containing a support having provided thereon blue-sensitive, green-sensitive, and red-sensitive layers, in which at least the blue-sensitive layer is composed of at least two layers including a more sensitive layer and a less sensitive layer. The most sensitive layer of the blue-sensitive layer is a blue-sensitive layer containing an emulsion of substantially monodispersed grains, and at least one layer other than the most sensitive layer contains an emulsion containing tabular silver halide grains of about 5:1 or more in average aspect ratio. The material has superior sharpness and graininess, and is useful for color photography.
Inventors
- 👤 Yoshihiko Shibahara
- 👤 Shinpei Ikenoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:06
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3022; G03C1/00; G03C1/005; G03C1/0051; G03C7/3029; G03C2007/3037; G03C2200/00; G03C2200/19
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
131 words
A silver halide photographic material comprising a support having thereon a layer structure: BH/BM/BL/GH/GM/GL/RH/RM/RL/S wherein B represents a blue-sensitive layer, G represents a green-sensitive layer, R represents a red-sensitive layer, H represents the most sensitive layer, M represents a medium sensitivity layer, L represents a low sensitivity layer, and S represents a support, said BH containing a silver halide emulsion comprising substantially monodispersed silver halide grains, in which about 60% or more of all silver halide grains by weight have a size falling within the range of about +20% of the average grain size r, at least said BL containing a silver halide emulsion comprising tabular silver halide grains having an average aspect ratio of at least about 5:1, and wherein tabular silver grains are not used in RH and RL.
Claim 2
Dependent Claim
131 words
A silver halide photographic material comprising a support having thereon a layer structure: BH/BM/BL/GH/GM/GL/RH/RM/RL/S wherein B represents a blue-sensitive layer, G represents a green-sensitive layer, R represents a red-sensitive layer, H represents the most sensitive layer, M represents a medium sensitivity layer, L represents a low sensitivity layer, and S represents a support, said BH containing a silver halide emulsion comprising substantially monodispersed silver halide grains, in which about 60% or more of all silver halide grains by weight have a size falling within the range of about +20% of the average grain size r, at least said BL containing a silver halide emulsion comprising tabular silver halide grains having an average aspect ratio of at least about 5:1, and wherein tabular silver grains are not used in RH and RL.
Claim 3
Dependent Claim
21 words
The silver halide photographic material of claim 1, wherein said tabular silver halide grains are also used in GH and/or GL.
Claim 4
Dependent Claim
20 words
The silver halide photographic material of claim 1, wherein said GH contains tabular grains and said RH contains monodispersed grains.
Claim 5
Dependent Claim
23 words
The silver halide photographic material of claim 1, wherein the average grain size of said monodispersed silver halide grains exceeds about 0.8 μm.
Claim 6
Dependent Claim
45 words
The silver halide photographic material of claim 1, wherein said monodispersed silver halide grains comprise an emulsion in which about 70% or more of all silver halide grains by weight have a size falling within the range of about ±20% of the average grain size.
Claim 7
Dependent Claim
18 words
The silver halide photographic material of claim 1, wherein said monodispersed silver halide grains are core/shell type grains.
Claim 8
Dependent Claim
51 words
The silver halide photographic material of claim 6, wherein said core/shell type grains are those which have a grain structure containing two or more layers different from each other in silver iodide content, with the outermost layer (shell portion) having a lower silver iodide content than the inner layers (core portion).
Claim 9
Dependent Claim
25 words
The silver halide photographic material of claim 7, wherein the silver iodide content in the core portion ranges from about 15 to 40 mol %.
Claim 10
Dependent Claim
25 words
The silver halide photographic material of claim 7, wherein the silver iodide content in the shell portion ranges from about 0.5 to 4.0 mol %.
Claim 11
Dependent Claim
23 words
The silver halide photographic material of claim 1, wherein said tabular silver halide grains have an aspect ratio of about 5 to 100.
Claim 12
Dependent Claim
23 words
The silver halide photographic material of claim 1, wherein said tabular silver halide grains have a diameter of about 1.0 to 10.0 μm.
Claim 13
Dependent Claim
27 words
The silver halide photographic material of claim 1, wherein said tabular silver halide grains have a silver iodide content of from about 4 to 10 mol %.
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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) | 1996-12-06 | 1997-06-07 | 1997-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-06 | 2001-06-07 | 2001-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-06 | 2005-06-07 | 2005-12-07 | $7700.00 | Window Closed / Lapsed |