US4755449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver halide photographic material and method for forming super high contrast negative images therewith
Assignee: Fujifilm Holdings Corp
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Filing: 1986-09-04
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Granted: 1988-07-05
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Expires: 2006-09-04
Abstract
Abstract A negative type silver halide photographic material and a method for processing the photographic material to form a super high contrast negative image are disclosed. The photographic material comprises a support and at least one emulsion layer on the support, said emulsion layer comprising silver halide grains comprising a core of silver halide containing silver iodide and a shell covering the core, said shell consisting essentially of silver bromide, silver chloride, or silver chlorobromide and having a thickness of from 0.01 to 0.08 μm, wherein the emulsion layer or a hydrophilic colloid layer other than the emulsion layer of the photograpic material contains a hydrazine derivative.
Inventors
- 👤 Nobuaki Inoue
- 👤 Senzo Sasaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:04
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/061
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
88 words
A negative type silver halide photographic material comprising a support and at least one silver halide emulsion layer on the support, wherein said emulsion layer comprises silver halide grains comprising a core of silver halide containing silver iodide and a shell covering the core, said shell consisting essentially of silver bromide, silver chloride, or silver chlorobromide and having a thickness of from 0.01 to 0.08 μm, and the emulsion layer or a hydrophilic colloid layer other than the emulsion layer of said photographic material contains a hydrazine derivative.
Claim 2
Dependent Claim
88 words
A negative type silver halide photographic material comprising a support and at least one silver halide emulsion layer on the support, wherein said emulsion layer comprises silver halide grains comprising a core of silver halide containing silver iodide and a shell covering the core, said shell consisting essentially of silver bromide, silver chloride, or silver chlorobromide and having a thickness of from 0.01 to 0.08 μm, and the emulsion layer or a hydrophilic colloid layer other than the emulsion layer of said photographic material contains a hydrazine derivative.
Claim 3
Dependent Claim
18 words
A negative type silver halide photographic material as in claim 1, wherein said shell consists of silver bromide.
Claim 4
Dependent Claim
23 words
A negative type silver halide photographic material as in claim 1, wherein said shell has a thickness of from 0.02 to 0.06 μm.
Claim 5
Dependent Claim
23 words
A negative type silver halide photographic material as in claim 2, wherein said shell has a thickness of from 0.02 to 0.06 μm.
Claim 6
Dependent Claim
26 words
A negative type silver halide photographic material as in claim 1, wherein the silver iodide content of the core is from 1.0 to 8 mol %.
Claim 7
Dependent Claim
26 words
A negative type silver halide photographic material as in claim 1, wherein the silver iodide content of the core is from 1.5 to 4.0 mol %.
Claim 8
Dependent Claim
20 words
A negative type silver halide photographic material as in claim 6, wherein the iodide is distributed uniformly in the core.
Claim 9
Independent Claim
126 words
A method for forming a super high contrast negative image which comprises imagewise exposing a silver halide photographic material comprising a support and at least one silver halide emulsion layer on the support, wherein said emulsion layer comprises silver halide grains comprising a core of silver halide containing silver iodide, and a shell covering the core, said shell consisting essentially of silver bromide, silver chloride, or silver chlorobromide and having a thickness of from 0.01 to 0.08 μm, and the emulsion layer or a hydrophilic colloid layer other than the emulsion layer of said photographic material contains a hydrazine derivative, and then developing the photographic material with a developer containing at least 0.15 mol/liter of sulfite ion and having a pH of from 10.5 to 12.3.
Claim 10
Independent Claim
126 words
A method for forming a super high contrast negative image which comprises imagewise exposing a silver halide photographic material comprising a support and at least one silver halide emulsion layer on the support, wherein said emulsion layer comprises silver halide grains comprising a core of silver halide containing silver iodide, and a shell covering the core, said shell consisting essentially of silver bromide, silver chloride, or silver chlorobromide and having a thickness of from 0.01 to 0.08 μm, and the emulsion layer or a hydrophilic colloid layer other than the emulsion layer of said photographic material contains a hydrazine derivative, and then developing the photographic material with a developer containing at least 0.15 mol/liter of sulfite ion and having a pH of from 10.5 to 12.3.
Claim 11
Dependent Claim
21 words
A method for forming a super high contrast negative image as in claim 8, wherein said shell consists of silver bromide.
Claim 12
Dependent Claim
26 words
A method for forming a super high contrast negative image as in claim 8, wherein said shell has a thickness of from 0.02 to 0.06 μm.
Claim 13
Dependent Claim
26 words
A method for forming a super high contrast negative image as in claim 9, wherein said shell has a thickness of from 0.02 to 0.06 μm.
Claim 14
Dependent Claim
29 words
A method for forming a super high contrast negative image as in claim 8, wherein the silver iodide content of the core is from 1.0 to 8 mol %.
Claim 15
Dependent Claim
29 words
A method for forming a super high contrast negative image as in claim 8, wherein the silver iodide content of the core is from 1.5 to 4.0 mol %.
Claim 16
Dependent Claim
23 words
A method for forming a super high contrast negative image as in claim 13, wherein the iodide is distributed uniformly in the core.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |