US4728602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive silver halide emulsions
Assignee: Fujifilm Holdings Corp
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Filing: 1986-10-07
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Granted: 1988-03-01
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Expires: 2006-10-07
Abstract
Abstract A light-sensitive silver iodobromide emulsion containing core/shell silver iodobromide grains having a core substantially comprising silver iodobromide containing at least about 5 mol % of silver iodide and a shell selected from the group consisting of (a) a shell comprising silver iodobromide having a lower silver iodide content than that of the silver iodobromide of the core and (b) a shell comprising silver bromide, wherein the relative standard deviation of the silver iodide content of the individual grains of said silver halide emulsion is lower than about 20%.
Inventors
- 👤 Yoshihiko Shibahara
- 👤 Shingo Ishimaru
- 👤 Jun Okuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C2001/03535; G03C2001/0357
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
109 words
A light-sensitive silver iodobromide emulsion containing core/shell silver iodobromide grains having a core substantially comprising silver iodobromide containing at least about 5 mol% of silver iodide and a shell selected from the group consisting of (a) a shell comprising silver iodobromide having a lower silver iodide content than that of the silver iodobromide of the core and (b) a shell comprising silver bromide, wherein the relative standard deviation of the silver iodide content of the individual grains of said silver halide emulsion is lower than about 20%, and wherein at least about 95% (by number) of the grains have a size within about ±40% of the mean grain size.
Claim 2
Dependent Claim
109 words
A light-sensitive silver iodobromide emulsion containing core/shell silver iodobromide grains having a core substantially comprising silver iodobromide containing at least about 5 mol% of silver iodide and a shell selected from the group consisting of (a) a shell comprising silver iodobromide having a lower silver iodide content than that of the silver iodobromide of the core and (b) a shell comprising silver bromide, wherein the relative standard deviation of the silver iodide content of the individual grains of said silver halide emulsion is lower than about 20%, and wherein at least about 95% (by number) of the grains have a size within about ±40% of the mean grain size.
Claim 3
Dependent Claim
24 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the silver iodide content of the core is from about 5 to 45 mol%.
Claim 4
Dependent Claim
24 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the silver iodide content of the core is from about 10 to 45 mol%.
Claim 5
Dependent Claim
22 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the silver iodide content of the shell is less than 5 mol%.
Claim 6
Dependent Claim
16 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the shell comprises of silver bromide.
Claim 7
Dependent Claim
85 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the core of said silver iodobromide grains comprises an inner portion substantially comprising silver iodobromide having a silver iodide content of less than about 5 mol%, and at least one outer layer comprising silver iodobromide having a silver iodide content of from about 5 to 45 mol% formed on the inner portion, and said shell comprises silver iodobromide having a silver iodide content of less than about 5 mol% or said shell comprises silver bromide.
Claim 8
Dependent Claim
32 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the core is formed by a double jet method at a constant pAg controlled in the range of about 7.0 to 10.0.
Claim 9
Dependent Claim
32 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the core is formed by a double jet method at a constant pAg controlled in the range of about 8.0 to 9.0.
Claim 10
Dependent Claim
53 words
The light-sensitive silver halide emulsion claimed in claim 7, wherein the core is formed by adding an aqueous silver nitrate solution and an aqueous halide solution such that the growing rate of the core is from about 30 to 100% of the critical growing rate of the silver halide crystal forming the core.
Claim 11
Dependent Claim
23 words
The light-sensitive silver halide emulsion claimed in claim 7, wherein the core grain is formed in the presence of a silver halide solvent.
Claim 12
Dependent Claim
51 words
The light-sensitive silver halide emulsion claimed in claim 7, wherein the shell is formed by simultaneously adding an aqueous silver nitrate solution and an aqueous halide solution to the silver halide emulsion containing core grains while controlling the pAg at a constant value in the range of about 6.0 to 10.0.
Claim 13
Dependent Claim
53 words
The light-sensitive silver halide emulsion claimed in claim 11, wherein the shell is formed by adding an aqueous silver nitrate solution and an aqueous halide solution such that the growing rate of the shell is from about 30 to 100% of the critical growing rate of the silver halide crystal forming the shell.
Claim 14
Dependent Claim
26 words
The light-sensitive silver halide emulsion claimed in claim 1, wherein the relative standard deviation of the iodide content of individual grains is less than about 12%.
Claim 15
Dependent Claim
34 words
The light-sensitive silver halide emulsion claimed in claim 9, wherein the addition rates of the aqueous silver nitrate solution and the aqueous halide solution are increased with the growth of the silver halide crystals.
Claim 16
Dependent Claim
33 words
The light-sensitive silver halide emulsion claimed in claim 9, wherein the concentrations of the aqueous silver nitrate solution and the aqueous halide solution are increased with the growth of the silver halide crystals.
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) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |