US4614711A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsion
Assignee: Fujifilm Holdings Corp
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Filing: 1984-08-08
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Granted: 1986-09-30
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Expires: 2004-08-08
Abstract
Abstract A silver halide emulsion containing negative working silver halide grains each comprising a core of silver bromide or silver bromoiodide, a first coating layer exterior the core of silver iodide or silver bromoiodide, and a second coating layer exterior the first coating layer composed of silver bromide or silver bromoiodide different from that of the first coating layer in halide composition, and having a projected area diameter-to-thickness ratio of less than 5, in which: (1) the first coating layer contains more iodide than the core by 10 mol % or more; and (2) silver in the first coating layer accounts for 0.01 to 30 mol % of the total silver in the grain.
Inventors
- 👤 Tadao Sugimoto
- 👤 Toshiaki Hayakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:06
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/0051; G03C1/035; G03C1/015; G03C2001/0156; G03C2001/03535; G03C2001/03558; G03C2200/00; G03C2200/43
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
118 words
A silver halide emulsion containing negative working silver halide grains, having surface sensitivity the same as or more than grain internal sensitivity, each comprising a core of silver bromide or silver bromoiodide, a first layer exterior said core composed of silver iodide or silver bromoiodide, and a second layer exterior said first layer composed of silver bromide or silver bromoiodide different from that of the first layer in halide composition, and having a projected area diameter-to-thickness ratio of less than 5, in which: (1) said first layer contains more iodide than said core by 10 mol% or more; and (2) silver in the first layer accounts for 0.01 to 30 mol% of the total silver in the grain.
Claim 2
Dependent Claim
118 words
A silver halide emulsion containing negative working silver halide grains, having surface sensitivity the same as or more than grain internal sensitivity, each comprising a core of silver bromide or silver bromoiodide, a first layer exterior said core composed of silver iodide or silver bromoiodide, and a second layer exterior said first layer composed of silver bromide or silver bromoiodide different from that of the first layer in halide composition, and having a projected area diameter-to-thickness ratio of less than 5, in which: (1) said first layer contains more iodide than said core by 10 mol% or more; and (2) silver in the first layer accounts for 0.01 to 30 mol% of the total silver in the grain.
Claim 3
Dependent Claim
20 words
The silver halide emulsion of claim 1, wherein the content of iodide in said core is 0 to 10 mol%.
Claim 4
Dependent Claim
13 words
The silver halide emulsion of claim 1, wherein said core is silver bromide.
Claim 5
Dependent Claim
25 words
The silver halide emulsion of claim 1, wherein the silver of said core accounts for 5 mol% or more of that of the total grains.
Claim 6
Dependent Claim
26 words
The silver halide emulsion of claim 1, wherein the silver of said first layer accounts for 0.01 to 10 mol% of that of the total grains.
Claim 7
Dependent Claim
21 words
The silver halide emulsion of claim 1, wherein the content of iodide in the first layer is 10 to 100 mol%.
Claim 8
Dependent Claim
14 words
The silver halide emulsion of claim 1, wherein said first layer is silver iodide.
Claim 9
Dependent Claim
21 words
The silver halide emulsion of claim 1, wherein the content of iodide in said second layer is 0 to 10 mol%.
Claim 10
Dependent Claim
14 words
The silver halide emulsion of claim 1, wherein said second layer is silver bromide.
Claim 11
Dependent Claim
26 words
The silver halide emulsion of claim 1, wherein the silver amount of said second layer is 5 to 90 mol% of that of the total grains.
Claim 12
Dependent Claim
20 words
The silver halide emulsion of claim 1, wherein the halide composition of said core or said second layer is homogeneous.
Claim 13
Dependent Claim
18 words
The silver halide emulsion of claim 1, wherein the sizes of the grains range from 0.5 to 5.0μ.
Claim 14
Dependent Claim
32 words
The silver halide emulsion of claim 1, wherein said silver halide grains account for 40 or more (in terms of the silver amount) of the total silver halide grains in the emulsion.
Claim 15
Dependent Claim
126 words
A process for preparing three-layered negative working silver halide grains having surface sensitivity the same as or more than grain internal sensitivity, which comprises forming cores of silver bromide or silver bromoiodide containing 10 mol% or less iodide, forming a first layer of silver bromoiodide or silver iodide on said cores by a halide substitution method or a coating method, and providing a second layer of silver bromoiodide different from that of the first layer in halide composition or silver bromide on said first layer, said first layer containing iodide in an amount greater than that of said cores by at least 10 mol% and the silver amount of said first layer accounting for 0.01 to 30 mol% of that of the total silver halide grains.
Claim 16
Dependent Claim
126 words
A process for preparing three-layered negative working silver halide grains having surface sensitivity the same as or more than grain internal sensitivity, which comprises forming cores of silver bromide or silver bromoiodide containing 10 mol% or less iodide, forming a first layer of silver bromoiodide or silver iodide on said cores by a halide substitution method or a coating method, and providing a second layer of silver bromoiodide different from that of the first layer in halide composition or silver bromide on said first layer, said first layer containing iodide in an amount greater than that of said cores by at least 10 mol% and the silver amount of said first layer accounting for 0.01 to 30 mol% of that of the total silver halide grains.
Claim 17
Dependent Claim
12 words
The process of claim 14, wherein said first layer is silver iodide.
Claim 18
Dependent Claim
18 words
The process of claim 14, wherein said first layer is silver bromoiodide containing 20 mol% or more iodide.
Claim 19
Dependent Claim
25 words
The process of claim 14, wherein the silver of the first layer accounts for 0.01 to 10 mol% of the silver of the total grains.
Claim 20
Dependent Claim
17 words
the process of claim 14, wherein the pAg during formation of the cores is 7.0 to 11.0.
Claim 21
Dependent Claim
19 words
The process of claim 14, wherein a silver halide solvent is present upon and/or after formation of the cores.
Claim 22
Dependent Claim
25 words
The process of claim 14, wherein the first layer is formed on the cores by a double jet-mixing method or a controlled double jet method.
References Cited (Backward Citations)
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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) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |