US5151346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing a silver halide emulsion
Assignee: Fujifilm Holdings Corp
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Filing: 1990-10-31
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Granted: 1992-09-29
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Expires: 2010-10-31
Abstract
Abstract A process for preparing a silver halide emulsion is disclosed, which comprises dissolving one or more substantially water-insoluble photographic additives in a solution of an organic solvent containing a surface active agent having a hydrophilic -SO 3 or --OSO 3 group wherein said organic solvent is an alcohol, and then adding the resulting solution to a silver halide emulsion. A small amount of a base, or small amounts of a base and an acid may optionally be present in the mixed solution of the organic solvent and the surface active agent prior to adding the one or more substantially water-insoluble photographic additives.
Inventors
- 👤 Fumitaka Terai
- 👤 Hiroyuki Yamagami
- 👤 Nobuhiko Uchino
- 👤 Masaki Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; Y; Y10; Y10S; Y10S430/00; Y10S430/136
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A process for preparing a silver halide emulsion, comprising the steps of: dissolving a surface active agent having a hydrophilic --SO 3 or --OSO 3 group in an alcohol, said alcohol being an aromatic primary alcohol or a halogenated alcohol, to make a solution of the surface active agent consisting essentially of the alcohol and the surface active agent; dissolving one or more substantially water-insoluble photographic additives in said solution of the surface active agent to make a solution of the surface active agent and the one or more substantially water-insoluble photographic additives, and then adding the resulting solution to a silver halide emulsion.
Claim 2
Dependent Claim
104 words
A process for preparing a silver halide emulsion, comprising the steps of: dissolving a surface active agent having a hydrophilic --SO 3 or --OSO 3 group in an alcohol, said alcohol being an aromatic primary alcohol or a halogenated alcohol, to make a solution of the surface active agent consisting essentially of the alcohol and the surface active agent; dissolving one or more substantially water-insoluble photographic additives in said solution of the surface active agent to make a solution of the surface active agent and the one or more substantially water-insoluble photographic additives, and then adding the resulting solution to a silver halide emulsion.
Claim 3
Dependent Claim
19 words
A process as in claim 1, wherein said substantially water-insoluble photographic additive is a photographic spectral sensitizing cyanine dye.
Claim 4
Dependent Claim
35 words
A process as in claim 1, wherein the amount of said surface active agent present in the resulting solution is 25 to 100 wt% based on the amount of the one or more photographic additives.
Claim 5
Dependent Claim
39 words
A process as in claim 1, wherein the alcohol is present in the solution in an amount of from 1/3 to 1/2 the amount required to dissolve the one or more substantially water-insoluble photographic additives in the alcohol alone.
Claim 6
Dependent Claim
27 words
A process in claim 1, wherein the surface active agent is an anionic surface active agent selected from the group consisting of alkylsulfates, alkylsulfonates, alkylarylsulfonates and sulfosuccinates.
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) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |