US4683193A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing silver halide photographic emulsion
Assignee: Fujifilm Holdings Corp
•
Filing: 1985-03-21
•
Granted: 1987-07-28
•
Expires: 2005-03-21
Abstract
Abstract A process for producing a spectrally sensitized silver halide photographic emulsion is described, comprising adding a substantially water-insoluble spectral sensitizing dye in an aqueous carrier to an emulsion before completion of the formation of silver halide grains without using an organic solvent.
Inventors
- 👤 Mikio Ihama
- 👤 Tadaaki Tani
- 👤 Hiroshi Ohnishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
59 words
A process for producing a spectrally sensitized silver halide photographic emulsion comprising adding a substantially water-insoluble organic spectral sensitizing dye in an aqueous medium to an emulsion before completion of the formation of silver halide grains without using an organic solvent, wherein said substantially water-insoluble organic spectral sensitizing dye has a water solubility of 0.01% by weight or less.
Claim 2
Dependent Claim
59 words
A process for producing a spectrally sensitized silver halide photographic emulsion comprising adding a substantially water-insoluble organic spectral sensitizing dye in an aqueous medium to an emulsion before completion of the formation of silver halide grains without using an organic solvent, wherein said substantially water-insoluble organic spectral sensitizing dye has a water solubility of 0.01% by weight or less.
Claim 3
Dependent Claim
40 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic spectral sensitizing dye is used in the form of particles having a mean grain size of 1 μm or less.
Claim 4
Dependent Claim
41 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic spectral sensitizing dye is used in the form of particles having a mean grain size of from 1 to 0.1 μm.
Claim 5
Dependent Claim
40 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye is dispersed in water with the aid of dispersing agent, and the resulting dispersion is added to the emulsion.
Claim 6
Dependent Claim
29 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 4, wherein the dispersion is dried to a powder form before addition to the emulsion.
Claim 7
Dependent Claim
39 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye and a dispersing agent are homogenized with a binder, and the resulting homogenate is added to the emulsion.
Claim 8
Dependent Claim
46 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye is pulverized in water without the aid of a dispersing agent into fine particles of 1 μm or less, and added directly to the emulsion.
Claim 9
Dependent Claim
34 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein the substantially water-insoluble organic dye is an anionic dye containing at least one sulfo group or sulfoalkyl group.
Claim 10
Dependent Claim
31 words
A process for producing a spectrally sensitized silver halide photographic emulsion as in claim 1, wherein said substantially water-insoluble organic spectral sensitizing dye is a cyanine dye or a merocyanine dye.
Claim 11
Dependent Claim
98 words
A process for producing a spectrally sensizited silver halide photographic emulsion as in claim 1, wherein said substantially water-insoluble organic spectral sensitizing dye is a cyanine dye represented by the formula (I): ##STR6## wherein Z 1 and Z 2 each represents a heterocyclic mucleus; L 1 and L 2 each represents a methine group or a substituted methine group; R 1 and R 2 each represents an alkyl group, a substituted alkyl group or an allyl group; m 1 represents 1, 2 or 3; X 1 represents an acid anion group; and N 1 represents 1 or 2.
References Cited (Backward Citations)
US3656962A
Cited
US4006025A
Cited
US4060419A
Cited
US4140530A
Cited
US4183756A
Cited
US4225666A
Cited
US4474872A
Cited
US4476220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-27 | 1991-01-26 | 1991-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-27 | 1995-01-26 | 1995-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-27 | 1999-01-26 | 1999-07-28 | $7700.00 | Window Closed / Lapsed |