US4761362A
Expired / Lapsed
US
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Processing a photographic material comprising an emulsion layer providing a contrast gradation and another layer providing a soft tone gradation
Assignee: Fujifilm Holdings Corp
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Filing: 1986-12-29
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Granted: 1988-08-02
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Expires: 2006-12-29
Abstract
Abstract An image forming process capable of providing photographic images having extremely high contrast and high resolution for use in photoengraving is disclosed, which comprises processing an image-wise exposed silver halide light-sensitive material having at least two silver halide emulsion layers on a support, one of said emulsion layers providing a contrasty gradation and the other of said emulsion layers providing a soft tone gradation, with a hydrazine contrast development system, a tetrazolium contrast development system or a lith development system, wherein the gamma (γ) value of the portion having a density (D) from 0.3 to 1.5 on the characteristic curve obtained is less than 10 and the gamma (γ) value of the portion having a density (D) from 1.5 to 3.0 is at least 10.
Inventors
- 👤 Senzo Sasaoka
- 👤 Shigenori Moriuchi
- 👤 Kimitaka Kameoka
- 👤 Kazunobu Katoh
- 👤 Yoshio Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:40
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/46; Y; Y10; Y10S; Y10S430/00; Y10S430/15
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
107 words
An image forming process which comprises processing an image-wise exposed silver halide light-sensitive material having at least two silver halide emulsion layers on a support, one of said emulsion layers providing a contrasty gradation and the other of said emulsion layers providing a soft tone gradation, with a hydrazine contrast development system, a tetrazolium contrast development system or a lith development system, wherein the gamma (γ) value of the portion having a density (D) from 0.3 to 1.5 on the characteristic curve obtained is less than 10 and the gamma (γ) value of the portion having a density (D) from 1.5 to 3.0 is at least 10.
Claim 2
Dependent Claim
107 words
An image forming process which comprises processing an image-wise exposed silver halide light-sensitive material having at least two silver halide emulsion layers on a support, one of said emulsion layers providing a contrasty gradation and the other of said emulsion layers providing a soft tone gradation, with a hydrazine contrast development system, a tetrazolium contrast development system or a lith development system, wherein the gamma (γ) value of the portion having a density (D) from 0.3 to 1.5 on the characteristic curve obtained is less than 10 and the gamma (γ) value of the portion having a density (D) from 1.5 to 3.0 is at least 10.
Claim 3
Dependent Claim
50 words
The image forming process of claim 1, wherein at least one of said silver halide emulsion layers contains a hydrazine derivative, and said processing is with a hydrazine contrast development system using a developer containing at least 0.15 mol/liter of sulfite ion and having a pH of 9.5 to 12.3.
Claim 4
Dependent Claim
50 words
The image forming process of claim 1, wherein at least one of said silver halide emulsion layers contains a tetrazolium compound, and said processing is with a tetrazolium contrast development system using a developer containing at least 0.15 mol/liter of sulfite ion and having a pH of 9.0 to 12.0.
Claim 5
Dependent Claim
44 words
The image forming process of claim 1, wherein at least one of said silver halide emulsion layer is a lith emulsion layer containing at least 60 mol% silver chloride and containing a polyalkylene oxide compound, and said processing is with a lith development system.
Claim 6
Dependent Claim
34 words
The image forming process of claim 2, wherein said silver halide material contains a silver halide emulsion layer substantially containing no hydrazine derivative or other hydrophilic colloid layer thereof but contains a quinone scavenger.
Claim 7
Dependent Claim
44 words
The image forming process of claim 1, wherein the γ value of the portion having a density from 0.3 to 1.5 is from 2 to 9 and the γ value of the portion having a density from 1.5 to 3.0 is at least 12.
Claim 8
Dependent Claim
45 words
The image forming process of claim 1, wherein the γ value of the portion having a density from 0.3 to 1.5 is from 4 to 8 and the γ value of the portion having a density from 1.5 to 3.0 is from 12 to 50.
Claim 9
Dependent Claim
40 words
The image forming process of claim 1, wherein the sensitivity (S H ) of the contrasty emulsion layer in relation to the sensitivity (S S ) of the soft tone gradation emulsion layer satisfies the following relationship O≦|S.sub.H -S.sub.S |≦0.6.
Claim 10
Dependent Claim
113 words
The image forming process of claim 2, wherein said hydrazine derivative is represented by the general formula (I) R.sub.1 --NHNH--G.sub.1 --R.sub.2 (I) wherein R 1 represents an aliphatic group or an aromatic 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 1 represents a carbonyl group, a sulfonyl group, a sulfinyl group, an N-substituted or unsubstituted iminomethylene group, or a mono-substituted phosphoryl group represented by ##STR16## wherein R represents a substituted or unsubstituted alkoxy group, a substituted or unsubstituted alkyl group, or a substituted or unsubstituted phenyl group.
Claim 11
Dependent Claim
157 words
The image forming process of claim 3, wherein said tetrazolium compound is a compound selected from the group consisting of compounds represented by the formula (IIa), (IIb) or (IIc): ##STR17## wherein R 3 , R 5 , R 6 , R 7 , R 10 , R 11 , R 12 , and R 13 each represents an allyl group, a phenyl group, a naphthyl group or a heterocyclic group; R 4 , R 8 , and R 9 each represents an allyl group, a phenyl group, a naphthyl group, a heterocyclic group, an alkyl group, a hydroxy group, a carboxy group or a salt thereof, an alkoxycarbonyl group, an amino group, a mercapto group, a nitro group, a cyano group, or a hydroxy group; D represents a divalent aromatic group; E represents an alkylene group, an allylene group, or an aralkylene group; X represents an anion-forming atom or atomic group; and n represents 1 or 2.
Claim 12
Dependent Claim
54 words
The image forming process of claim 4, wherein said polyalkylene oxide compound is a condensation product of a polyalkylene oxide composed of at least 10 units of alkylene oxide having 2 to 4 carbon atoms and a compound having at least one active hydrogen, or a block copolymer of one or more polyalkylene oxides.
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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) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |