Patent US4276374A successfully refreshed from Google Patents.
US4276374A
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Silver halide photographic emulsion with thioether sensitizer
Assignee: Fujifilm Holdings Corp
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Filing: 1979-05-30
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Granted: 1981-06-30
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Expires: 1999-05-30
Abstract
Abstract A silver halide photographic emulsion containing the compound represented by the formula (I): R.sub.1 --(X--R.sub.3).sub.m --X--R.sub.2 (I) wherein R 1 and R 2 each represents an alkyl group containing 1 to 5 carbon atoms substituted with two or more substituents selected from --OH, --NHR 4 , --COOR 4 , --CONH 2 , --SO 3 H, --COOM, or --SO 3 M, R 3 represents an alkylene group containing 1 to 4 carbon atoms which may be substituted by --OH, R 4 represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms, X represents a sulfur or oxygen atom, provided at least one X is a sulfur atom, m represents 0 or an integer of 1 to 4, and M represents an alkali metal atom.
Inventors
- 👤 Hiroyuki Mifune
- 👤 Nobuaki Miyasaka
- 👤 Yoshiharu Fuseya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/043; G03C1/06; G03C1/08; G03C1/09; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
93 words
A silver halide photographic emulsion containing about 0.001 to 1 gram per mol of silver halide of the compound represented by the formula: ##STR6## wherein R 5 represents an alkyl group containing 1 to 3 carbon atoms substituted by --OH, --COOH, --COOM, or --COOR, the number of substituents being 1 or 2, n 1 and n 3 each represents 1 or 2, and n 2 represents 1, 2, 3, or 4, M represents an alkali metal atom, and R represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms.
Claim 2
Dependent Claim
93 words
A silver halide photographic emulsion containing about 0.001 to 1 gram per mol of silver halide of the compound represented by the formula: ##STR6## wherein R 5 represents an alkyl group containing 1 to 3 carbon atoms substituted by --OH, --COOH, --COOM, or --COOR, the number of substituents being 1 or 2, n 1 and n 3 each represents 1 or 2, and n 2 represents 1, 2, 3, or 4, M represents an alkali metal atom, and R represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms.
Claim 3
Dependent Claim
95 words
The silver halide emulsion of claim 1 additionally containing about 0.001 to 1 gram per mol of silver halide of a compound represented by the formulae (A), (B) or (C): ##STR7## wherein Z represents an alkyl group containing 1 to 18 carbon atoms, an aryl group containing 6 to 18 carbon atoms, or a heterocyclic ring, Y represents an atomic group necessary to complete an aromatic ring containing 6 to 18 carbon atoms or a heterocyclic ring, M represents a metal atom or an organic cation and n represents an integer of 2 to 10.
Claim 4
Dependent Claim
28 words
The silver halide emulsion of claim 1, wherein said thioether compound is present in an amount of about 0.01 g to 0.2 g per mol of silver halide.
Claim 5
Dependent Claim
31 words
The silver halide emulsion of claim 2, wherein the molar ratio of said thioether compound to the compound represented by the formulae (A), (B) or (C) is about 1:0.001 to 1:2.
Claim 6
Dependent Claim
15 words
The silver halide emulsion of claim 1, wherein said emulsion further contains a sensitizing agent.
Claim 7
Dependent Claim
111 words
In a process for preparing a silver halide emulsion, the improvement which comprises adding about 0.001 to 1 gram per mol of silver halide of a compound of the formula: ##STR8## wherein R 5 represents an alkyl group containing 1 to 3 carbon atoms substituted by --OH, --COOH, --COOM or --COOR, the number of substituents being 1 or 2, n 1 and n 3 each represents 1 or 2, and n 2 represents 1, 2, 3 or 4, M represents an alkali metal atom, and R represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms, during preparation and before said emulsion is coated on a support.
Claim 8
Dependent Claim
111 words
In a process for preparing a silver halide emulsion, the improvement which comprises adding about 0.001 to 1 gram per mol of silver halide of a compound of the formula: ##STR8## wherein R 5 represents an alkyl group containing 1 to 3 carbon atoms substituted by --OH, --COOH, --COOM or --COOR, the number of substituents being 1 or 2, n 1 and n 3 each represents 1 or 2, and n 2 represents 1, 2, 3 or 4, M represents an alkali metal atom, and R represents a hydrogen atom or an alkyl group containing 1 to 5 carbon atoms, during preparation and before said emulsion is coated on a support.
Claim 9
Dependent Claim
18 words
The process of claim 6, wherein said thioether compound is added upon silver halide formation and/or physical ripening.
Claim 10
Dependent Claim
14 words
The process of claim 6, wherein said thioether compound is added during chemical ripening.
Claim 11
Dependent Claim
26 words
The process of claim 6, wherein said thioether compound is added in an amount of about 0.01 g to 0.2 g per mol of silver halide.
Claim 12
Dependent Claim
102 words
The process of claim 6, wherein in addition to said thioether compound about 0.001 to 1 gram per mol of silver halide of a compound of the formula (A), (B) or (C) is added to said emulsion: ##STR9## wherein Z represents an alkyl group containing 1 to 18 carbon atoms, an aryl group containing 6 to 18 carbon atoms, or a heterocyclic ring, Y represents an atomic group necessary to complete an aromatic ring containing 6 to 18 carbon atoms or a heterocyclic ring, M represents a metal atom or an organic cation and n represents an integer of 2 to 10.
Claim 13
Dependent Claim
14 words
A silver halide emulsion prepared by the process of claim 6, 7 or 8.
References Cited (Backward Citations)
US2955036A
Cited
US3021215A
Cited
US3057724A
Cited
US3506443A
Cited
US3625697A
Cited
US4057429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |