Patent US1762306A successfully refreshed from Google Patents.
Patent US5268264A successfully refreshed from Google Patents.
US5268264A
Expired / Lapsed
US
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Spectrally sensitized octahedral emulsions with buried shell sensitization
Assignee: Eastman Kodak Co
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Filing: 1991-04-10
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Granted: 1993-12-07
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Expires: 2011-04-10
Abstract
Abstract A photographic emulsion is disclosed in which a spectral sensitizing dye is adsorbed to the surface of octahedral silver bromide grains optionally containing iodide. The grains each contain a buried shell formed in the presence of a hexacoordination complex of iron and at least three cyanide ligands.
Inventors
- 👤 Alfred P. Marchetti
- 👤 Myra T. Olm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/035
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
107 words
A photographic emulsion comprised of radiation-sensitive silver bromide grains optionally containing iodide exhibiting a face centered crystal structure and having {111} crystal faces and a spectral sensitizing dye adsorbed to the surface of the grains, characterized in that said grains each contain a buried shell formed in the presence of a hexacoordination complex of iron and at least three cyanide ligands, said buried shell being located on a core grain portion having a diameter equal to at least half of the grain diameter and beneath a surface shell surrounding said buried shell, said surface shell having a thickness in the range of from 20 to 350 Å.
Claim 2
Dependent Claim
107 words
A photographic emulsion comprised of radiation-sensitive silver bromide grains optionally containing iodide exhibiting a face centered crystal structure and having {111} crystal faces and a spectral sensitizing dye adsorbed to the surface of the grains, characterized in that said grains each contain a buried shell formed in the presence of a hexacoordination complex of iron and at least three cyanide ligands, said buried shell being located on a core grain portion having a diameter equal to at least half of the grain diameter and beneath a surface shell surrounding said buried shell, said surface shell having a thickness in the range of from 20 to 350 Å.
Claim 3
Dependent Claim
26 words
A photographic emulsion according to claim 1 further characterized in that said grains contain from about 0.1 to 20 mole percent iodide, based on total silver.
Claim 4
Dependent Claim
26 words
A photographic emulsion according to claim 2 further characterized in that said grains contain from about 1 to 10 mole percent iodide, based on total silver.
Claim 5
Dependent Claim
21 words
A photographic emulsion according to claim 1 further characterized in that silver halide forming said grains consists essentially of silver bromide.
Claim 6
Dependent Claim
25 words
A photographic emulsion according to claim 1 further characterized in that said silver halide grains exhibit at least one of sulfur and gold surface sensitization.
Claim 7
Dependent Claim
41 words
A photographic emulsion according to claim 1 further characterized in that said hexacoordination complex satisfies the formula: [Fe(CN).sub.6-y L.sub.y ].sup.n where L is a bridging ligand, y is the integer zero, 1, 2 or 3 and n is -3, or -4.
Claim 8
Dependent Claim
16 words
A photographic emulsion according to claim 6 further characterized in that L is a halide ligand.
Claim 9
Dependent Claim
19 words
A photographic emulsion according to claim 6 further characterized in that said hexacoordination complex satisfies the formula [Fe(CN).sub.6 ].sup.-4.
Claim 10
Dependent Claim
28 words
A photographic emulsion according to claim 6 further characterized in that said emulsion contains from 10 -4 to 0.1 mole percent of the hexacoordination complex, based on silver.
Claim 11
Dependent Claim
29 words
A photographic emulsion according to claim 9 further characterized in that said emulsion contains from 5×10 -4 to 10 -2 mole percent of the hexacoordination complex, based on silver.
Claim 12
Dependent Claim
29 words
A photographic emulsion according to claim 1 further characterized in that said core grain portion has a diameter which is at least 70 percent of the overall grain diameter.
Claim 13
Dependent Claim
27 words
A photographic emulsion according to claim 1 further characterized in that said surface shell portion has a thickness in the range of from 25 to 100 Å.
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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 |