Patent US3359306A successfully refreshed from Google Patents.
Patent US4349622A successfully refreshed from Google Patents.
US4349622A
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Photographic silver halide emulsion comprising epitaxial composite silver halide crystals, silver iodobromide emulsion and process for preparing the same
Assignee: Konica Minolta Inc
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Filing: 1980-05-29
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Granted: 1982-09-14
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Expires: 2000-05-29
Abstract
Abstract There are provided a photographic silver halide emulsion which comprises composite silver halide crystals consisting essentially of multi-faceted silver iodobromide crystals containing 15-40 mole % of silver iodide and silver halide crystals containing not more than 10 mole % of silver iodide, said silver halide crystals being combined as epitaxial silver halide crystals with said multi-faceted silver iodobromide crystals, at least half of the facetes of said multi-faceted crystals being substantially free of said epitaxial crystals and the amount of said epitaxial crystals being limited to not more than 75 mole % based on the total silver halide forming said composite crystals, a silver halide emulsion comprising silver halide grains consisting essentially of silver iodobromide containing 15-40 mole % of silver iodide substantially homogeneously distributed therein, and a process for preparing the same.
Inventors
- 👤 Takeo Koitabashi
- 👤 Syozi Matsuzaka
- 👤 Tashifumi Iijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C2001/03552; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37405
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
109 words
A photographic silver halide emulsion which comprises composite silver halide crystals consisting essentially of multi-faceted silver iodobromide crystals containing 15-40 mole % of silver iodide and silver halide crystals containing not more than 10 mole % of silver iodide, said silver halide crystals being combined as epitaxial silver halide crystals with said multi-faceted silver iodobromide crystals through epitaxial junction, at least half of the facetes of said multi-faceted silver iodobromide crystals being substantially free of said epitaxial silver halide crystals, and the amount of said epitaxial silver halide being limited to not more than 75 mole % based on the total silver halide forming said composite silver halide crystals.
Claim 2
Dependent Claim
109 words
A photographic silver halide emulsion which comprises composite silver halide crystals consisting essentially of multi-faceted silver iodobromide crystals containing 15-40 mole % of silver iodide and silver halide crystals containing not more than 10 mole % of silver iodide, said silver halide crystals being combined as epitaxial silver halide crystals with said multi-faceted silver iodobromide crystals through epitaxial junction, at least half of the facetes of said multi-faceted silver iodobromide crystals being substantially free of said epitaxial silver halide crystals, and the amount of said epitaxial silver halide being limited to not more than 75 mole % based on the total silver halide forming said composite silver halide crystals.
Claim 3
Dependent Claim
37 words
A photographic silver halide emulsion as claimed in claim 1 wherein said multi-faceted silver iodobromide contains 20-40 mole % of silver iodide and said epitaxial silver halide contains not more than 8 mole % of silver iodide.
Claim 4
Dependent Claim
38 words
A photographic silver halide emulsion as claimed in claim 1 wherein the amount of said epitaxial silver halide is in the range of 1-50 mole % based on the total silver halide forming said composite silver halide crystals.
Claim 5
Dependent Claim
28 words
A photographic silver halide emulsion as claimed in claim 1, 2 or 3 wherein the mean granular diameter of said multi-faceted silver iodobromide crystals is at least 0.2μ.
Claim 6
Dependent Claim
111 words
A process for preparing a silver halide emulsion comprising silver grains consisting essentially of silver iodobromide containing 15-40 mole % of silver iodide which comprises producing the silver halide by simultaneous addition of (i) a solution comprising a water-soluble bromide and a water-soluble iodide and (ii) a solution containing a water-soluble silver salt, to a solution containing a protective colloid in a simultaneous mixing way and by keeping the pAg of the solution in the range of 1-8 during the period of the production of the silver halide, the amount of the iodide ion in said water-soluble iodide being 15-40 mole percent of the silver ion in said water-soluble silver salt.
Claim 7
Dependent Claim
111 words
A process for preparing a silver halide emulsion comprising silver grains consisting essentially of silver iodobromide containing 15-40 mole % of silver iodide which comprises producing the silver halide by simultaneous addition of (i) a solution comprising a water-soluble bromide and a water-soluble iodide and (ii) a solution containing a water-soluble silver salt, to a solution containing a protective colloid in a simultaneous mixing way and by keeping the pAg of the solution in the range of 1-8 during the period of the production of the silver halide, the amount of the iodide ion in said water-soluble iodide being 15-40 mole percent of the silver ion in said water-soluble silver salt.
Claim 8
Dependent Claim
39 words
A process for preparing a silver halide emulsion as claimed in claim 5 wherein the amount of said protective colloid is in the range of about 0.5-100 g. per one liter of the emulsion containing the formed silver halide.
Claim 9
Dependent Claim
25 words
A process for preparing a silver halide emulsion as claimed in claim 5 wherein said pAg of the solution is in the range of 2-7.
Claim 10
Dependent Claim
26 words
A process for preparing a silver halide emulsion as claimed in claim 5 wherein the pH of the solution is in the range of about 2-9.
Claim 11
Dependent Claim
26 words
A process for preparing a silver halide emulsion as claimed in claim 8 wherein the pH of the solution is in the range of about 2-5.
Claim 12
Dependent Claim
30 words
A process for preparing a silver halide emulsion as claimed in claim 5 wherein the precipitation of the silver halide is carried out at a temperature of around 30°-90° C.
Claim 13
Dependent Claim
30 words
A process for preparing a silver halide emulsion as claimed in claim 10 wherein the production of the silver halide is carried out at a temperature of around 35°-80° C.
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) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |