US4401754A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic emulsion
Assignee: Konica Minolta Inc
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Filing: 1981-10-30
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Granted: 1983-08-30
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Expires: 2001-10-30
Abstract
Abstract A silver halide photographic emulsion characterized in that it comprises silver halide grains which are reduction-sensitized during the process of growing said grains and containing a compound of the formula ##STR1## wherein R 1 and R 2 are selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group and a cycloalkyl group and R 3 , R 4 , R 5 and R 6 are selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an acyl group, a carboxyl group, an aldehyde group, an amino group, a sulfo group, an alkylthio group, an acylamino group, an aryloxy group, an arylthio group, an alkylamino group, an alkoxycabonyl group and a sulfonamide group. The emulsion exhibits both high sensitivity and improved stability as compared with prior art compositions.
Inventors
- 👤 Akio Suzuki
- 👤 Hiroaki Shiozawa
- 👤 Takeo Koitabashi
- 👤 Hideki Takiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/34; Y; Y10; Y10S; Y10S430/00; Y10S430/141
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
146 words
A silver halide photographic emulsion characterized in that it comprises silver halide grains reduction-sensitized in a process of growing the silver halide grains, and a compound represented by the following General Formula [I]: ##STR31## (wherein R 1 and R 2 are selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group and a cycloalkyl group and R 3 , R 4 , R 5 and R 6 are selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an acyl group, a carboxyl group, an aldehyde group, an amino group, a sulfo group, an alkylthio group, an acylamino group, an aryloxy group, an arylthio group, an alkylamino group, an alkoxycabonyl group and a sulfonamide group.)
Claim 2
Dependent Claim
146 words
A silver halide photographic emulsion characterized in that it comprises silver halide grains reduction-sensitized in a process of growing the silver halide grains, and a compound represented by the following General Formula [I]: ##STR31## (wherein R 1 and R 2 are selected from the group consisting of a hydrogen atom, an alkyl group, an alkenyl group, an aryl group, an acyl group and a cycloalkyl group and R 3 , R 4 , R 5 and R 6 are selected from the group consisting of a hydrogen atom, a halogen atom, a hydroxy group, an alkyl group, an alkenyl group, a cycloalkyl group, an aryl group, an alkoxy group, an acyl group, a carboxyl group, an aldehyde group, an amino group, a sulfo group, an alkylthio group, an acylamino group, an aryloxy group, an arylthio group, an alkylamino group, an alkoxycabonyl group and a sulfonamide group.)
Claim 3
Dependent Claim
28 words
A silver halide photographic emulsion according to claim 1, the silver halide grains are reduction-sensitized by adding a reducing agent and/or a water-soluble silver salt to the emulsion.
Claim 4
Dependent Claim
20 words
A silver halide photographic emulsion according to claim 1, the silver halide grains are further sensitized by gold and/or sulfur.
Claim 5
Dependent Claim
28 words
A silver halide photographic emulsion according to claim 3, the sensitization by gold and/or sulfur is carried out, after completion of the reduction-sensitization of the silver halide grains.
Claim 6
Dependent Claim
18 words
A silver halide photographic emulsion according to claim 2, the reducing agent is thiourea dioxide or stannous chloride.
Claim 7
Dependent Claim
16 words
A silver halide photographic emulsion according to claim 2, the water-soluble silver salt is silver nitrate.
Claim 8
Dependent Claim
36 words
A method for producing a silver halide photographic emulsion comprising: (1) reduction-sensitizing in a process of growing the silver halide grains and (2) adding a compound according to claim 1 to the silver halide photographic emulsion.
Claim 9
Dependent Claim
23 words
A method according to claim 7, reduction-sensitizing is carried out by adding a reducing agent and/or a water-soluble silver salt to the emulsion.
Claim 10
Dependent Claim
15 words
A method according to claim 8, the reducing agent is thiourea dioxide or stannous chloride.
Claim 11
Dependent Claim
13 words
A method according to claim 8, the water-soluble silver salt is silver nitrate.
Claim 12
Dependent Claim
17 words
A method according to claim 7, the silver halide grains are further sensitized by gold and/or sulfur.
Claim 13
Dependent Claim
27 words
A method according to claim 11, the silver halide grains are further sensitized by gold and/or sulfur after completion of the reduction-sensitization of the silver halide grains.
Claim 14
Dependent Claim
36 words
A light-sensitive silver halide photographic material comprising a support and a silver halide photographic emulsion comprising silver halide grains, reduction-sensitized in a process of growing the silver halide grains, and a compound according to claim 1.
Claim 15
Dependent Claim
29 words
A light-sensitive silver halide photographic material according to claim 13, the silver halide grains are reduction-sensitized by adding a reducing agent and/or a water-soluble silver salt to the emulsion.
Claim 16
Dependent Claim
21 words
A light-sensitive silver halide photographic material according to claim 13, the silver halide grains are further sensitized by gold and/or sulfur.
Claim 17
Dependent Claim
30 words
A light-sensitive silver halide photographic material according to claim 13, the silver-halide grains are further sensitized by gold and/or sulfur after completion of the reduction-sensitization of the silver halide grains.
Claim 18
Dependent Claim
19 words
A light-sensitive silver halide photographic material according to claim 14, the reducing agent is thiourea dioxide or stannous chloride.
Claim 19
Dependent Claim
17 words
A light-sensitive silver halide photographic material according to claim 14, the water-soluble silver salt is silver nitrate.
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) | 1986-08-29 | 1987-02-28 | 1987-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-29 | 1991-02-28 | 1991-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-29 | 1995-02-28 | 1995-08-30 | $7700.00 | Window Closed / Lapsed |