US5024931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic emulsions sensitized by the introduction of oligomers
Assignee: Eastman Kodak Co
•
Filing: 1990-01-05
•
Granted: 1991-06-18
•
Expires: 2010-01-05
Abstract
Abstract A photographic silver halide emulsion is disclosed in which the face centered cubic crystal lattice structure of the grains contain at adjacent cation sites metal ions chosen from group VIII, periods 5 and 6. The metal ions are placed at adjacent cation lattice sites by sensitizing the grains with oligomers each containing at least two of the group VIII metal ions.
Inventors
- 👤 Francis J. Evans
- 👤 Ralph W. Jones, Jr.
- 👤 Robert D. Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/09; G03C1/035
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
46 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing, on average, at least one pair of metal ions chosen from group VIII, periods 5 and 6, at adjacent cation sites of the crystal lattice.
Claim 2
Dependent Claim
46 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing, on average, at least one pair of metal ions chosen from group VIII, periods 5 and 6, at adjacent cation sites of the crystal lattice.
Claim 3
Dependent Claim
63 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing at cation sites of the crystal lattice metal ions chosen from group VIII, periods 5 and 6 characterized in that, on average, at least five pairs of adjacent cation sites of said crystal lattice are occupied by said group VIII metal ions.
Claim 4
Dependent Claim
63 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing at cation sites of the crystal lattice metal ions chosen from group VIII, periods 5 and 6 characterized in that, on average, at least five pairs of adjacent cation sites of said crystal lattice are occupied by said group VIII metal ions.
Claim 5
Dependent Claim
63 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing at cation sites of the crystal lattice metal ions chosen from group VIII, periods 5 and 6 characterized in that, on average, at least ten pairs of adjacent cation sites of said crystal lattice are occupied by said group VIII metal ions.
Claim 6
Dependent Claim
63 words
A photographic silver halide emulsion comprised of radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing at cation sites of the crystal lattice metal ions chosen from group VIII, periods 5 and 6 characterized in that, on average, at least ten pairs of adjacent cation sites of said crystal lattice are occupied by said group VIII metal ions.
Claim 7
Dependent Claim
33 words
A photographic silver halide emulsion according to claim 1 further characterized in that said grains contain from 2 to 20 of said group VIII metal ions linked to each other by bridging ligands.
Claim 8
Dependent Claim
34 words
A photographic silver halide emulsion according to claim 1 further characterized in that said grains contain from 6 to 10 of said said group VIII metal ions linked to each other by bridging ligands.
Claim 9
Dependent Claim
42 words
A photographic silver halide emulsion according to claim 1 further characterized in that said face centered cubic lattice structure contains anions between said adjacent cation site group VIII metal ions differing from remaining anions in said face centered cubic crystal lattice structure.
Claim 10
Dependent Claim
27 words
A photographic silver halide emulsion according to claim 6 further characterized in that said anions between said adjacent cation site group VIII metal ions are halide ions.
Claim 11
Dependent Claim
40 words
A photographic silver halide emulsion according to claim 6 further characterized in that said anions between said adjacent cation site group VIII metal ions are pseudohalide ions chosen from the group consisting of cyanide, cyanate, thiocyanate, selenocyanate, and tellurocyanate anions.
Claim 12
Dependent Claim
27 words
A photographic silver halide emulsion according to any one of claims 1 to 8 inclusive further characterized in that said group VIII metal ions are iridium ions.
Claim 13
Independent Claim
59 words
A method of preparing a photographic emulsion comprising forming radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing metal ions chosen from group VIII, periods 5 and 6, characterized in that the group VIII metal ions are supplied in the form of oligomers each providing at least two of the group VIII metal ions.
Claim 14
Independent Claim
59 words
A method of preparing a photographic emulsion comprising forming radiation sensitive silver halide grains exhibiting a face centered cubic crystal lattice structure containing metal ions chosen from group VIII, periods 5 and 6, characterized in that the group VIII metal ions are supplied in the form of oligomers each providing at least two of the group VIII metal ions.
Claim 15
Dependent Claim
29 words
A method of preparing a photographic emulsion according to claim 10 further characterized in that said oligomers each provide from 2 to 20 of the group VIII metal ions.
Claim 16
Dependent Claim
29 words
A method of preparing a photographic emulsion according to claim 11 further characterized in that said oligomers each provide from 6 to 10 of the group VIII metal ions.
Claim 17
Dependent Claim
41 words
A method of preparing a photographic emulsion according to claim 10 further characterized that the oligomers are introduced into the face centered cubic crystal lattice structure as anionic hexacoordination complexes consisting essentially of the group VIII metal ions and bridging ligands.
Claim 18
Dependent Claim
21 words
A method of preparing a photographic emulsion according to claim 13 further characterized in that the bridging ligands are halide ions.
Claim 19
Dependent Claim
34 words
A method of preparing a photographic emulsion according to claim 13 further characterized in that the bridging ligands are pseudohalide ions chosen from the class consisting of cyanide, cyanate, thiocyanate, selenocyanate, and tellurocyanate ions.
Claim 20
Dependent Claim
52 words
A method of preparing a photographic emulsion according to claim 10 further characterized in that the anionic oligomers are selected from among those satisfying the formulae: M.sub.2 L.sub.10 M.sub.6 L.sub.24 M.sub.8 L.sub.32 and M.sub.10 L.sub.38 where M represents a group VIII, period 5 or 6, element and L represents a bridging ligand.
Claim 21
Dependent Claim
24 words
A method of preparing a photographic emulsion according to claim 16 further characterized in that L is chosen from among halide and pseudohalide ions.
Claim 22
Dependent Claim
18 words
A method of preparing a photographic emulsion according to claim 17 further characterized in that M is iridium.
Claim 23
Dependent Claim
26 words
A method of preparing a photographic emulsion according to claim 10 further characterized in that at least five group VIII metal ions are introduced per grain.
Claim 24
Dependent Claim
26 words
A method of preparing a photographic emulsion according to claim 19 further characterized in that at least ten group VIII metal ions are introduced per grain.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |