US4762769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic material
Assignee: Fujifilm Holdings Corp
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Filing: 1986-09-22
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Granted: 1988-08-09
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Expires: 2006-09-22
Abstract
Abstract A silver halide photographic material which has at least one silver halide emulsion layer comprising silver chloride or silver chlorobromide grains which has a bromide content of 5 mol % or less, and containing a rhodium salt in an amount of from 1×10 -6 to 5×10 -4 mole per mole of silver in said layer, and contains both a hydrazine derivative and a dye having an absorption peak in the wavelength region of from 400 nm to 550 nm in at least one of said emulsion layer another hydrophilic colloid layer, to thereby control the ratio of sensitivity at 360 nm to sensitivity at 400 nm (S 360 /S 400 ratio) to not less than 30, thereby achieving ultra-high contrast, high sensitivity, and a satisfactory aptitude for safelight.
Inventors
- 👤 Toshiro Takahashi
- 👤 Ken-ichi Kuwabara
- 👤 Masahiro Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:54
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A silver halide photographic material which has at least one silver halide emulsion layer comprising silver halide grains selected from silver chloride grains and silver chlorobromide grains which have a bromide content of 5 mol % or less, and containing a rhodium salt in an amount of from 1×10 -6 to 5×10 -4 mole per mole of silver in said layer, and contains both a hydrazine derivative and a dye having an absorption peak in the wavelength range of from 400 nm to 550 nm in at least one of said emulsion layer and another hydrophilic colloid layer, to thereby control the ratio of sensitivity at 360 nm to sensitivity at 400 nm (S 360 /S 400 ratio) to not less than 30/1.
Claim 2
Dependent Claim
123 words
A silver halide photographic material which has at least one silver halide emulsion layer comprising silver halide grains selected from silver chloride grains and silver chlorobromide grains which have a bromide content of 5 mol % or less, and containing a rhodium salt in an amount of from 1×10 -6 to 5×10 -4 mole per mole of silver in said layer, and contains both a hydrazine derivative and a dye having an absorption peak in the wavelength range of from 400 nm to 550 nm in at least one of said emulsion layer and another hydrophilic colloid layer, to thereby control the ratio of sensitivity at 360 nm to sensitivity at 400 nm (S 360 /S 400 ratio) to not less than 30/1.
Claim 3
Dependent Claim
39 words
A silver halide photographic material as in claim 1, wherein said silver chloride or silver bromochloride grains contains said rhodium salt in an amount of from 2×10 -6 to 5×10 -5 mole per mole of silver in said layer.
Claim 4
Dependent Claim
28 words
A silver halide photographic material as in claim 1, wherein said silver chlorobromide or silver chloride has a halide composition of at least 98 mol % silver chloride.
Claim 5
Dependent Claim
24 words
A silver halide photographic material as in claim 1, wherein said silver halide grains have a mean grain size of 0.5 μm or less.
Claim 6
Dependent Claim
31 words
A silver halide photographic material as in claim 1, wherein said hydrazine derivative is present in an amount of from 1×10 -6 to 5×10 -2 mole per mole of silver halide.
Claim 7
Dependent Claim
28 words
A silver halide photographic material as in claim 1, wherein said dye is present in an amount of from 10 -3 g/m 2 to 1 g/m 2 .
Claim 8
Dependent Claim
32 words
A silver halide photographic material as in claim 1, wherein said dye is selected from the group consisting of oxonol dyes, hemioxonol dyes, merocyanine dyes, cyanine dyes, azo dyes and arylidene dyes.
Claim 9
Dependent Claim
141 words
A silver halide photographic material as in claim 1, wherein the hydrazine derivative is selected from compounds represented by formula (I) or (II) ##STR5## wherein R 1 represents an aliphatic or aromatic group or unsaturated heterocyclic group; R 2 represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted alkoxy group, or a substituted or unsubstituted aryloxy group; and G represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphonyl group, or an N-substitued or unsubstituted iminomethylene group; Acryl is an acyl group; Ar is an aryl group, and R 1' is a hydrogen atom or a sulfinic acid radical substituent and R 2' is a sulfinic acid radical substituent when R 1' is a hydrogen atom, and a hydrogen atom when R 1' is a sulfinic acid radical.
Claim 10
Dependent Claim
68 words
A silver halide photographic material as in wherein said hydrazine derivative is present in an amount of 1×10 -6 to 5×10 -2 g/m 2 to 1 g/m 2 , wherein said dye is selected from the group consisting of oxonol dyes, hemioxonol dyes, merocyanine dyes, cyanine dyes, azo dyes and arylidene dyes, and wherein the hydrazine derivative is selected from compounds represented by formula (I) or (II) ##STR6##
Claim 11
Dependent Claim
68 words
A silver halide photographic material as in wherein said hydrazine derivative is present in an amount of 1×10 -6 to 5×10 -2 g/m 2 to 1 g/m 2 , wherein said dye is selected from the group consisting of oxonol dyes, hemioxonol dyes, merocyanine dyes, cyanine dyes, azo dyes and arylidene dyes, and wherein the hydrazine derivative is selected from compounds represented by formula (I) or (II) ##STR6##
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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) | 1991-08-09 | 1992-02-08 | 1992-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-09 | 1996-02-08 | 1996-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-09 | 2000-02-08 | 2000-08-09 | $7700.00 | Window Closed / Lapsed |