Patent DE744758C successfully refreshed from Google Patents.
US4686176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multilayer multi-color photographic material
Assignee: Konica Minolta Inc
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Filing: 1985-09-20
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Granted: 1987-08-11
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Expires: 2005-09-20
Abstract
Abstract In a light-sensitive silver halide photographic material having blue-sensitive, green-sensitive and red-sensitive photosensitive layers on a support and being capable of forming a multi-color image, the improvement wherein at least one of said photosensitive layers comprises a high sensitivity layer and a low sensitivity layer; at least one of said high sensitivity layers contains flat plate silver halide grains with an average aspect ratio of 5:1 or higher; and at least one of said low sensitivity layer contains an emulsion comprising silver halide grains which are substantially mono-dispersed.
Inventors
- 👤 Toshihiko Yagi
- 👤 Katsumasa Yamazaki
- 👤 Kenji Michiue
- 👤 Yoshiharu Mochizuki
- 👤 Sohei Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:48
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3022
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
123 words
In a light-sensitive silver halide photographic material having blue-sensitive, green-sensitive and red-sensitive photosensitive layers on a support and being capable of forming a multi-color image, the improvement wherein at least one of said photosensitive layers comprises a high sensitivity layer and a low sensitivity layer; at least one of said high sensitivity layers contains flat plate silver halide grains with an average aspect ratio of 5:1 or higher; and at least one of said low sensitivity layers contains an emulsion comprising silver halide grains which are substantially mono-dispersed, said mono-dispersed grains have a grain size within the range of ±20% of the average grain size in an amount of 60% by weight or more based on the total amount of silver halide grains.
Claim 2
Dependent Claim
123 words
In a light-sensitive silver halide photographic material having blue-sensitive, green-sensitive and red-sensitive photosensitive layers on a support and being capable of forming a multi-color image, the improvement wherein at least one of said photosensitive layers comprises a high sensitivity layer and a low sensitivity layer; at least one of said high sensitivity layers contains flat plate silver halide grains with an average aspect ratio of 5:1 or higher; and at least one of said low sensitivity layers contains an emulsion comprising silver halide grains which are substantially mono-dispersed, said mono-dispersed grains have a grain size within the range of ±20% of the average grain size in an amount of 60% by weight or more based on the total amount of silver halide grains.
Claim 3
Dependent Claim
27 words
The light-sensitive silver halide photographic material according to claim 1, wherein said flat plate silver halide grains have an average aspect ratio of from 5:1 to 100:1.
Claim 4
Dependent Claim
27 words
The light-sensitive silver halide photographic material according to claim 2, wherein said flat plate silver halide grains have an average aspect ratio of from 5:1 to 20:1.
Claim 5
Dependent Claim
27 words
The light-sensitive silver halide photographic material according to claim 1, wherein said flat plate silver halide grains have an average grain size of 0.5 to 15.0 μm.
Claim 6
Dependent Claim
43 words
The light-sensitive silver halide photographic material according to claim 1, wherein said flat plate silver halide grains are contained in an amount of 40% by weight or more based on the total amount of silver halide grains contained in the high sensitivity layer.
Claim 7
Dependent Claim
52 words
The light-sensitive silver halide photographic material according to claim 1, wherein said flat plate silver halide grains are not subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces, and comprise silver iodobromide grains with a content of silver iodide of 0 to 15 mole %.
Claim 8
Dependent Claim
40 words
The light-sensitive silver halide photographic material according to claim 6, wherein said flat plate silver iodobromide grains have a central region and an outer region; the iodide content in the outer region being lower than that in the central region.
Claim 9
Dependent Claim
33 words
The light-sensitive silver halide photographic material according to claim 1, wherein said flat plate silver halide grains are mono-dispersed ones having a fluctuation coefficient of the grain size distribution of 25% or less.
Claim 10
Dependent Claim
46 words
The light-sensitive silver halide photographic material according to claim 1, wherein said flat plate silver halide grains are subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces, and the silver halide used for the epitaxial growth is silver bromide.
Claim 11
Dependent Claim
35 words
The light-sensitive silver halide photographic material according to claim 9, wherein the proportion of the epitaxial crystals obtained by said epitaxial growth is 5 to 30 mol % based on the total silver halide moles.
Claim 12
Dependent Claim
68 words
The light-sensitive silver halide photographic material according to claim 1, wherein the silver halide grains in said low sensitivity layer are core/shell type silver iodobromo grains; the silver iodide contents in the core portion and in the shell portion being 5 to 40 mole % and 5 mole or less, respectively, and the silver iodide content in the shell portion being lower than that in the core portion.
Claim 13
Dependent Claim
28 words
The light-sensitive silver halide photographic material according to claim 11, wherein the proportion of the shell portion in the core/shell type silver halide grains is 10 to 80%.
Claim 14
Dependent Claim
81 words
The light-sensitive silver halide photographic material according to claim 1, wherein the mono-dispersed silver halide grains in said low sensitivity layer are subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces; the silver halide used as the host crystal for the epitaxial growth being silver iodobromide containing 6 to 40 mole % of silver iodide and the silver halide for epitaxial growth being silver iodobromide containing 0 to 5 mole % of silver iodide.
Claim 15
Dependent Claim
36 words
The light-sensitive silver halide photographic material according to claim 13, wherein the proportion of the epitaxial crystal portion obtained by the epitaxial growth is 5 to 30 mole % based on the total silver halide moles.
Claim 16
Dependent Claim
31 words
The light-sensitive silver halide photographic material according to claim 1, wherein the mono-dispersed silver halide grains in said low sensitivity layer have an average grain size of 0.4 μm or more.
Claim 17
Dependent Claim
80 words
The light-sensitive silver halide photographic material according to claim 3, wherein said flat plate silver halide grains have an average grain size of 0.5 to 15.0 μm; said flat plate silver halide grains are contained in an amount of 40% by weight or more based on the total amount of silver halide grains contained in the high sensitivity layer; and the mono-dispersed silver halide grains in said low sensitivity layer have an average grain size of 0.4 μm or more.
Claim 18
Dependent Claim
104 words
The light-sensitive silver halide photographic material according to claim 16 wherein said flat plate silver halide grains are not subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces, and comprise silver iodobromide grains with a content of silver iodide of 0 to 15 mole %; said flat plate silver iodobromide grains have a central region and an outer region; the iodide content in the outer region being lower than that in the central region; and said flat plate silver halide grains are mono-dispersed ones having a fluctuation coefficient of the grain size distribution of 25% or less.
Claim 19
Dependent Claim
166 words
The light-sensitive silver halide photographic material according to claim 16 wherein said flat plate silver halide grains are subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces, and the silver halide used for the epitaxial growth is silver bromide; the proportion of the epitaxial crystals obtained by said epitaxial growth is 5 to 30 mole % based on the total silver halide moles; the mono-dispersed silver halide grains in said low sensitivity layer are subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces; the silver halide used as the host crystal for the epitaxial growth being silver iodobromide containing 6 to 40 mole % of silver iodide and the silver halide for epitaxial growth being silver iodobromide containing 0 to 5 mole % of silver iodide; and the proportion of the epitaxial crystal portion obtained by the epitaxial growth is 5 to 30 mole % based on the total silver halide moles.
Claim 20
Dependent Claim
87 words
The light-sensitive silver halide photographic material according to claim 17 wherein the silver halide grains in said low sensitivity layer are core/shell type silver iodobromo grains; the silver iodide contents in the core portion and in the shell portion being 5 to 40 mole % and 5 mole % or less, respectively, and the silver iodide content in the shell portion being lower than that in the core portion; and the proportion of the shell portion in the core/shell type silver halide grains is 10 to 80%.
Claim 21
Dependent Claim
126 words
The light-sensitive silver halide photographic material according to claim 17 wherein said mono-dispersed grains have a grain size within the range of ±20% of the average grain size in an amount of 70% by weight or more based on the total amount of silver halide grains; said flat plate silver halide grains have an average grain size of 1.0 to 10.0 μm; said flat plate silver halide grains are not subjected to sensitization by epitaxial growth of a different kind of silver salt on their surfaces, and comprise silver iodobromide grains with a content of silver iodide of 4 to 10 mole %; and the mono-dispersed silver halide grains in said low sensitivity layer have an average grain size of 0.6 to 2.0 μm or more.
Claim 22
Dependent Claim
118 words
The light-sensitive silver halide photographic material according to claim 18 wherein said mono-dispersed grains have a grain size within the range of ±20% of the average grain size in an amount of 70% by weight or more based on the total amount of silver halide grains; said flat plate silver halide grains have a average grain size of 1.0 to 10.0 μm; wherein said silver iodobromide used as the host crystal contains from 7 to 20 mole % silver iodide and the silver iodobromide used for epitaxial growth contains 0.4 mole % of silver iodide; and the mono-dispersed silver halide grains in said low sensitivity layer have an average grain size of 0.6 to 2.0 μm or more.
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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) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |