Patent US4681838A successfully refreshed from Google Patents.
US4681838A
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US
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Silver halide photographic emulsion and process for production thereof
Assignee: Fujifilm Holdings Corp
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Filing: 1985-06-14
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Granted: 1987-07-21
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Expires: 2005-06-14
Abstract
Abstract A silver halide emulsion and a process for producing the same are disclosed. In the process, at least one compound selected from hydrogen peroxide or an adduct or precursor thereof, a peroxy acid salt, and ozone is added to an emulsion in the step prior to the end of chemical ripening. The emulsion exhibits reduced fog, improved stability with time, and improved sensitivity.
Inventors
- 👤 Hiroyuki Mifune
- 👤 Tadao Shishido
- 👤 Yoshiaki Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:12
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/0051; G03C1/34; G03C1/10; G03C1/12; G03C1/14; G03C1/16; G03C1/18; G03C1/22; G03C1/26; Y; Y10; Y10S; Y10S430/00; Y10S430/144
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
57 words
A process for producing a substantially surface latent image type silver halide photographic emulsion, comprising the steps of precipitation, physical ripening, washing, and chemical ripening wherein at least one compound selected from hydrogen peroxide or an adduct or precursor thereof is added to an emulsion in the step prior to the end of the chemical ripening step.
Claim 2
Dependent Claim
57 words
A process for producing a substantially surface latent image type silver halide photographic emulsion, comprising the steps of precipitation, physical ripening, washing, and chemical ripening wherein at least one compound selected from hydrogen peroxide or an adduct or precursor thereof is added to an emulsion in the step prior to the end of the chemical ripening step.
Claim 3
Dependent Claim
20 words
A process as in claim 1, wherein said compound is added during the precipitation, physical ripening, or chemical ripening step.
Claim 4
Dependent Claim
26 words
A process as in claim 1, wherein said compound is added in an amount of from 10 -6 to 10 moles per mole of silver halide.
Claim 5
Dependent Claim
26 words
A process as in claim 3, wherein said compound is added in an amount of from 10 -4 to 1 mole per mole of silver halide.
Claim 6
Dependent Claim
26 words
A process as in claim 4, wherein said compound is added in an amount of from 10 -3 to 1 mole per mole of silver halide.
Claim 7
Dependent Claim
86 words
A process for producing a substantially surface latent image type silver halide photographic emulsion, comprising the steps of precipitation, physical ripening, washing, and chemical ripening steps, wherein at least one compound selected from hydrogen peroxide or an adduct or precursor thereof, a peroxy acid salt, and ozone is added to an emulsion in the step prior to the end of the chemical ripening step, and wherein silver halide grains contained in said emulsion are silver halide tabular grains having an aspect ratio of 3 or more.
Claim 8
Dependent Claim
86 words
A process for producing a substantially surface latent image type silver halide photographic emulsion, comprising the steps of precipitation, physical ripening, washing, and chemical ripening steps, wherein at least one compound selected from hydrogen peroxide or an adduct or precursor thereof, a peroxy acid salt, and ozone is added to an emulsion in the step prior to the end of the chemical ripening step, and wherein silver halide grains contained in said emulsion are silver halide tabular grains having an aspect ratio of 3 or more.
Claim 9
Dependent Claim
24 words
A process as in claim 6, wherein said silver halide tabular grains have an aspect ratio in the range of from 3 to 50.
Claim 10
Dependent Claim
38 words
A process as in claim 6, wherein said silver halide tabular grains having an aspect ratio of 3 or more is present in a proportion of at least 40% by weight based on the total silver halide grains.
Claim 11
Dependent Claim
17 words
A process as in claim 1, wherein a chemical sensitizer is used during the chemical ripening step.
Claim 12
Dependent Claim
18 words
A process as in claim 9, wherein said chemical sensitizer is a sulfur sensitizer or a gold sensitizer.
Claim 13
Dependent Claim
16 words
A process as in claim 9, wherein an auxiliary agent for a gold sensitizer is used.
Claim 14
Dependent Claim
17 words
A process as in claim 6, wherein a chemical sensitizer is used during the chemical ripening step.
Claim 15
Dependent Claim
18 words
A process as in claim 12, wherein said chemical sensitizer is a sulfur sensitizer or a gold sensitizer.
Claim 16
Dependent Claim
16 words
A process as in claim 12, wherein an auxiliary agent for a gold sensitizer is used.
Claim 17
Dependent Claim
18 words
A process as in claim 6, wherein said silver halide emulsion is spectrally sensitized with a sensitizing dye.
Claim 18
Dependent Claim
18 words
A process as in claim 1, wherein said silver halide emulsion is spectrally sensitized with a sensitizing dye.
Claim 19
Dependent Claim
22 words
A process as in claim 16, wherein said sensitizing dye is a cyanine dye, a merocyanine dye or a complex cyanine dye.
Claim 20
Dependent Claim
17 words
A process as in claim 16, wherein said sensitizing dye is used after addition of hydrogen peroxide.
Claim 21
Dependent Claim
86 words
A substantially latent image type silver halide photographic emulsion, which is produced by a process comprising the steps of precipitation, physical ripening, washing, and chemical ripening, wherein at least one compound selected from hydrogen peroxide or an adduct or precursor thereof, a peroxy acid salt, and ozone is added to an emulsion in the step prior to the end of the chemical ripening step, and wherein silver halide grains contained in said emulsion are silver halide tabular grains having an aspect ratio of 3 or more.
Claim 22
Dependent Claim
86 words
A substantially latent image type silver halide photographic emulsion, which is produced by a process comprising the steps of precipitation, physical ripening, washing, and chemical ripening, wherein at least one compound selected from hydrogen peroxide or an adduct or precursor thereof, a peroxy acid salt, and ozone is added to an emulsion in the step prior to the end of the chemical ripening step, and wherein silver halide grains contained in said emulsion are silver halide tabular grains having an aspect ratio of 3 or more.
Claim 23
Dependent Claim
24 words
An emulsion as in claim 19, wherein said silver halide tabular grains have an aspect ratio in the range of from 3 to 50.
Claim 24
Dependent Claim
38 words
An emulsion as in claim 19, wherein said silver halide tabular grains having an aspect ratio of 3 or more is present in a proportion of at least 40% by weight based on the total silver halide grains.
Claim 25
Dependent Claim
26 words
A process as in claim 6, wherein said compound is added in an amount of from 10 -6 to 10 moles per mole of silver halide.
Claim 26
Dependent Claim
26 words
A process as in claim 6, wherein said compound is added in an amount of from 10 -4 to 1 mole per mole of silver halide.
Claim 27
Dependent Claim
26 words
A process as in claim 6, wherein said compound is added in an amount of from 10 -3 to 1 mole per mole of silver halide.
Claim 28
Dependent Claim
22 words
A process as in claim 15, wherein said sensitizing dye is a cyanine dye, a merocyanine dye or a complex cyanine dye.
Claim 29
Dependent Claim
20 words
A process as in claim 6, wherein said compound is added during the precipitation, physical ripening, or chemical ripening step.
Claim 30
Dependent Claim
26 words
An emulsion as in claim 19, wherein said compound is added in an amount of from 10 -6 to 10 moles per mole of silver halide.
Claim 31
Dependent Claim
17 words
An emulsion as in claim 19, wherein a chemical sensitizer is used during the chemical ripening step.
Claim 32
Dependent Claim
19 words
An emulsion as claimed in claim 28, wherein said chemical sensitizer is a sulfur sensitizer or a gold sensitizer.
Claim 33
Dependent Claim
17 words
An emulsion as claimed in claim 29, wherein an auxilliary agent for a gold sensitizer is used.
Claim 34
Dependent Claim
19 words
An emulsion as claimed in claim 19, wherein said silver halide emulsion is spectrally sensitized with a sensitizing dye.
Claim 35
Dependent Claim
23 words
An emulsion as claimed in claim 31, wherein said sensitizing dye is a cyanine dye, a merocyanine dye or a complex cyanine dye.
Claim 36
Dependent Claim
23 words
An emulsion as claimed in claim 31, wherein said sensitizing dye is used after addition of hydrogen peroxide, peroxy acid salt or ozone.
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) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |