Patent US4777113A successfully refreshed from Google Patents.
US4777113A
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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 13:24
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.
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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) | 1991-10-11 | 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 |