US4945035A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions containing internally modified silver halide grains
Assignee: Eastman Kodak Co
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Filing: 1988-04-08
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Granted: 1990-07-31
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Expires: 2008-04-08
Abstract
Abstract Photographic silver halide emulsions are disclosed comprised of radiation sensitive silver halide grains containing greater than 50 mole percent chloride and less than 5 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands. The emulsions exhibit increased sensitivity.
Inventors
- 👤 John E. Keevert, Jr.
- 👤 Woodrow G. McDugle
- 👤 Raymond S. Eachus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:27
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/015
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
65 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains containing greater than 50 mole percent chloride and less than 5 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands.
Claim 2
Dependent Claim
65 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains containing greater than 50 mole percent chloride and less than 5 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence of a hexacoordination complex of rhenium, ruthenium, or osmium with at least four cyanide ligands.
Claim 3
Dependent Claim
26 words
A photographic emulsion according to claim 1 further characterized in that said silver halide grains contain greater than 70 mole percent chloride, based on total silver.
Claim 4
Dependent Claim
26 words
A photographic emulsion according to claim 1 further characterized in that said silver halide grains contain less than 2 mole percent iodide, based on total silver.
Claim 5
Dependent Claim
19 words
A photographic emulsion according to claim 1 further characterized in that said silver halide grains exhibit gold surface sensitization.
Claim 6
Dependent Claim
20 words
A photographic emulsion according to claim 1 further characterized in that said silver halide grains additionally exhibit sulfur surface sensitization.
Claim 7
Dependent Claim
35 words
A photographic emulsion according to claim 1 further characterized in that said rhenium, ruthenium, or osmium is present in said emulsion in a concentration of from 1×10 -6 to 5×10 -4 mole per silver mole.
Claim 8
Dependent Claim
47 words
A photographic emulsion according to claim 1 further characterized in that said hexacoordination complex satisfies the formula: [M(CN).sub.6-y L.sub.y ].sup.n where M is rhenium, ruthenium, or osmium, L is a bridging ligand, y is the integer zero, 1, or 2. and n is -2, -3, or -4.
Claim 9
Dependent Claim
16 words
A photographic emulsion according to claim 7 further characterized in that L is a halide ligand.
Claim 10
Dependent Claim
18 words
A photographic emulsion according to claim 7 further characterized in that y is zero and n is -4.
Claim 11
Dependent Claim
100 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains surface sensitized with at least one of gold and sulfur, said grains containing greater than 70 mole percent chloride and less than 2 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence from 1×10 -6 to 5×10 -4 mole per silver mole of a hexacoordination complex of the formula: [M(CN).sub.6-y L.sub.y ].sup.-4 where M is ruthenium or osmium, L is halide, and y is the integer zero, 1, or 2.
Claim 12
Dependent Claim
100 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains surface sensitized with at least one of gold and sulfur, said grains containing greater than 70 mole percent chloride and less than 2 mole percent iodide, based on total silver, with any residual halide being bromide, said grains exhibiting a face centered cubic crystal lattice structure formed in the presence from 1×10 -6 to 5×10 -4 mole per silver mole of a hexacoordination complex of the formula: [M(CN).sub.6-y L.sub.y ].sup.-4 where M is ruthenium or osmium, L is halide, and y is the integer zero, 1, or 2.
Claim 13
Dependent Claim
30 words
A photographic emulsion according to claim 10 further characterized in that said hexacoordination complex is present in a concentration of from 10 -5 to 10 -4 mole per silver mole.
Claim 14
Dependent Claim
21 words
A photographic emulsion according to claim 10 further characterized in that said silver halide grains are sulfur and gold surface sensitized.
Claim 15
Dependent Claim
25 words
A photographic emulsion according to claim 10 further characterized in that said silver halide grains contain greater than 85 mole percent chloride, based on silver.
Claim 16
Dependent Claim
19 words
A photographic emulsion according to claim 13 further characterized in that said silver halide grains are silver chloride grains.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |