US4542094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide emulsion
Assignee: Konica Minolta Inc
•
Filing: 1983-10-21
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Granted: 1985-09-17
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Expires: 2003-10-21
Abstract
Abstract A novel silver halide emulsion is disclosed. This silver halide emulsion comprises in combination (a) silver halide made of silver chlorobromide or silver chlorobromoiodide, (b) a hydroxytetrazaindene compound and (c) a nitrogen-containing heterocyclic compound having at least one mercapto group, the grains of said silver halide having such a size distribution that the variation co-efficient is not more than 0.15.
Inventors
- 👤 Kunihiro Koshizuka
- 👤 Syoji Matsuzaka
- 👤 Takaaki Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:21
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
73 words
A silver halide photographic paper having on a support at least one layer which contains a silver halide emulsion comprising in combination (a) silver halide made of silver chlorobromoiodide containing 0 to 2 mol % of iodine, (b) a hydroxytetrazaindene compound and (c) a nitrogen-containing heterocyclic compound having at least one mercapto group, the grains of said silver halide having such a size distribution that the variation coefficient is not more than 0.15.
Claim 2
Dependent Claim
73 words
A silver halide photographic paper having on a support at least one layer which contains a silver halide emulsion comprising in combination (a) silver halide made of silver chlorobromoiodide containing 0 to 2 mol % of iodine, (b) a hydroxytetrazaindene compound and (c) a nitrogen-containing heterocyclic compound having at least one mercapto group, the grains of said silver halide having such a size distribution that the variation coefficient is not more than 0.15.
Claim 3
Dependent Claim
37 words
A silver halide emulsion according to claim 1, wherein said silver halide (a) is chemically ripened at a pH of 6.2 or more in the presence of the hydroxytetrazaindene compound before the addition of a sulfur-containing compound.
Claim 4
Dependent Claim
20 words
A silver halide emulsion according to claim 1 or 2, wherein said nitrogen-containing heterocyclic compound (c) is a triazole compound.
Claim 5
Dependent Claim
55 words
A silver halide emulsion according to claim 1, wherein said variation coefficient is defined by the following formulas: ##EQU2## wherein, Σni is the total number of the silver halide grains observed, ri is the size of the ith silver halide grain, and when the size of individual grains is ri and their number is ni.
Claim 6
Dependent Claim
16 words
A silver halide emulsion according to claim 2, wherein said sulfur-containing compound is a sulfur sensitizer.
Claim 7
Dependent Claim
15 words
A silver halide emulsion according to claim 5, wherein said sulfur sensitizer is a thiosulfate.
References Cited (Backward Citations)
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Cited
US4078937A
Cited
JPS53127714A
Cited
JPS53141027A
Cited
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Cited
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US4328302A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |