US4777113A
Expired / Lapsed
US
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Silver halide photographic material containing a silica containing overlayer and specific hydrazine derivatives
Assignee: Fujifilm Holdings Corp
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Filing: 1987-05-28
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Granted: 1988-10-11
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Expires: 2007-05-28
Abstract
Abstract A negative silver halide photographic material comprising a support having provided thereon at least one light-sensitive silver halide emulsion layer and further provided on the light-sensitive halide layer at least two light-insensitive hydrophilic colloidal layers, the uppermost layer of the light-insensitive hydrophilic colloidal layers containing colloidal silica and the emulsion layer or other hydrophilic colloidal layer containing a hydrazine derivative. The material exhibits super-high contrast and is less susceptible to scratch fog.
Inventors
- 👤 Nobuaki Inoue
- 👤 Senzo Sasaoka
- 👤 Tomoo Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061; G03C1/76; G03C1/7614; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10S430/162
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
A negative silver halide photographic material capable of providing an image having a gamma of 10 or more comprising a support having provided thereon at least one light-sensitive silver halide emulsion layer and further provided on said light-sensitive silver halide emulsion layer at least two light-insensitive hydrophilic colloidal layers, wherein the uppermost layer of said light-insensitive hydrophilic colloidal layers contains colloidal silica having an average particle size of from 7 to 120 mμ in an amount of from about 0.05 to 0.5 g/m 2 and said emulsion layer or other hydrophilic colloidal layer contains a hydrazine derivative represented by the formula: R.sub.1 --NHNH--CHO wherein R 1 represents a substituted or unsubstituted aryl group.
Claim 2
Dependent Claim
113 words
A negative silver halide photographic material capable of providing an image having a gamma of 10 or more comprising a support having provided thereon at least one light-sensitive silver halide emulsion layer and further provided on said light-sensitive silver halide emulsion layer at least two light-insensitive hydrophilic colloidal layers, wherein the uppermost layer of said light-insensitive hydrophilic colloidal layers contains colloidal silica having an average particle size of from 7 to 120 mμ in an amount of from about 0.05 to 0.5 g/m 2 and said emulsion layer or other hydrophilic colloidal layer contains a hydrazine derivative represented by the formula: R.sub.1 --NHNH--CHO wherein R 1 represents a substituted or unsubstituted aryl group.
Claim 3
Dependent Claim
19 words
A negative silver halide photographic material as in claim 1, wherein said light-insensitive hydrophilic colloidal layers comprise two layers.
Claim 4
Dependent Claim
26 words
A negative silver halide photographic material as in claim 1, wherein the colloidal silica has an average particle size of from about 8 to 80 mμ.
Claim 5
Dependent Claim
17 words
A negative silver halide photographic material as in claim 1, wherein the colloidal silica contains a stabilizer.
Claim 6
Dependent Claim
19 words
A negative silver halide photographic material as in claim 5, wherein the stabilizer is potassium hydroxide or ammonium hydroxide.
Claim 7
Dependent Claim
36 words
A negative silver halide photographic material as in claim 1, wherein the colloidal silica is present in an amount of from about 10 to 50% by weight based on the hydrophilic colloid in the uppermost layer.
Claim 8
Dependent Claim
27 words
A negative silver halide photographic material as in claim 1, wherein said light-insensitive hydrophilic colloidal layers have a total thickness of from about 0.3 to 5 μm.
Claim 9
Dependent Claim
27 words
A negative silver halide photographic material as in claim 9, wherein said light-insensitive hydrophilic colloidal layers have a total thickness of from about 0.5 to 2 μm.
Claim 10
Dependent Claim
31 words
A negative silver halide photographic material as in claim 2, wherein the ratio of thickness of said upper light-insensitive layer to that of said lower light-insensitive layer is 1.0 or smaller.
Claim 11
Dependent Claim
20 words
A negative silver halide photographic material as in claim 1, wherein said hydrazine derivative is present in said emulsion layer.
Claim 12
Dependent Claim
34 words
A negative silver halide photographic material as in claim 1, wherein said hydrazine derivative is present in an amount of from about 10 -6 to 1×10 -1 mol per mol of said silver halide.
Claim 13
Dependent Claim
61 words
A negative silver halide photographic material as in claim 1, wherein the silver halide grain is silver haloiodides having a silver iodide content on the surfaces thereof greater than the average silver iodide content which are produced in the presence of about 10 -8 to 10 -5 mols of an iridium salt or a complex salt thereof per mol of silver.
Claim 14
Dependent Claim
25 words
A negative silver halide photographic material as in claim 1, the innermost of said at least two light-insensitive hydrophilic colloidal layers contains no colloidal silica.
References Cited (Backward Citations)
US3053662A
Cited
US3161519A
Cited
US3591379A
Cited
US3620728A
Cited
US4069053A
Cited
US3895950A
Cited
US3874878A
Cited
US3920456A
Cited
US4224401A
Cited
US4264719A
Cited
US4190449A
Cited
US4221857A
Cited
US4235959A
Cited
US4508818A
Cited
US4499179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |