US4828972A
Expired / Lapsed
US
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Method for manufacturing silver halide emulsion
Assignee: Fujifilm Holdings Corp
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Filing: 1987-10-26
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Granted: 1989-05-09
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Expires: 2007-10-26
Abstract
Abstract A method for manufacturing a silver halide emulsion comprising the steps of forming silver halide grains in the presence of a hydrophilic colloid, physical ripening, desalting, and chemical ripening, wherein a photographic spectral sensitizing dye is added to the emulsion after adding at least 85% by weight of a soluble silver salt solution but before the desalting step is described.
Inventors
- 👤 Mikio Ihama
- 👤 Sadanobu Shuto
- 👤 Tadaaki Tani
- 👤 Naoyasu Deguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:36
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/015; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C2200/00; G03C2200/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
79 words
A method for manufacturing a sulfur sensitized, surface latent image-type silver halide emulsion comprising the steps of forming silver halide grains in the presence of a hydrophilic colloid, physical ripening, desalting, and chemical ripening, wherein a photographic spectral sensitizing dye selected from the group consisting of a cyanine dye, merocyanine dye and a hemicyanine dye is added to the emulsion only after adding at least 95% by weight of a soluble silver salt solution but before the desalting step.
Claim 2
Independent Claim
79 words
A method for manufacturing a sulfur sensitized, surface latent image-type silver halide emulsion comprising the steps of forming silver halide grains in the presence of a hydrophilic colloid, physical ripening, desalting, and chemical ripening, wherein a photographic spectral sensitizing dye selected from the group consisting of a cyanine dye, merocyanine dye and a hemicyanine dye is added to the emulsion only after adding at least 95% by weight of a soluble silver salt solution but before the desalting step.
Claim 3
Dependent Claim
33 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein the spectral sensitizing dye is added in an amount of from 0.01 to 10 mmol per mol of silver halide.
Claim 4
Dependent Claim
33 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein the spectral sensitizing dye is added in an amount of from 0.1 to 1 mmol per mol of silver halide.
Claim 5
Dependent Claim
28 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein said spectrally sensitizing dye has a solubility of 0.01 wt % or less in water.
Claim 6
Dependent Claim
35 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein the spectral sensitizing dye is added after completion of the addition of the soluble silver salt solution but before the desalting step.
Claim 7
Dependent Claim
23 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein the silver halide grain is regular in the crystal form.
Claim 8
Dependent Claim
22 words
A method for manufacturing a silver halide emulsion as in claim 6, wherein the silver halide grain is cubic, octahedral, or tetradecahedral.
Claim 9
Dependent Claim
23 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein the silver halide grain is irregular in the crystal form.
Claim 10
Dependent Claim
21 words
A method for manufacturing a silver halide emulsion as in claim 8, wherein the silver halide grain is spherical or tabular.
Claim 11
Dependent Claim
39 words
A method for manufacturing a silver halide emulsion as in claim 1, wherein the spectral sensitizing dye is a monomethine dye or a trimethine cyanine dye having one or two sulfonic grops of sulfoalkyl groups as a substituent group.
Claim 12
Dependent Claim
22 words
A method for manufacturing a silver halide emulsion as in claim 10, wherein the spectral sensitizing dye is oxacarbocyanine, thiacarbocyanine, or benzimidacarbocyanine.
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) | 1992-05-08 | 1992-11-07 | 1993-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-08 | 1996-11-07 | 1997-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-08 | 2000-11-07 | 2001-05-09 | $7700.00 | Window Closed / Lapsed |