Patent US4746593A successfully refreshed from Google Patents.
US4746593A
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Silver halide radiation-sensitive photographic materials
Assignee: Tulalip Consultoria Comercial SU
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Filing: 1986-07-02
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Granted: 1988-05-24
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Expires: 2006-07-02
Abstract
Abstract A negative-acting photographic element comprising a support having coated thereon one or more layers of a radiation-sensitive silver halide emulsion, at least one of the layers containing a hydrazine compound in which the one or more radiation-sensitive silver halide layers contain a first silver halide emulsion having an average grain size of from 0.1 to 0.4 microns and a second silver halide emulsion of particles with an average grain volume of less than one half that of the particles of the first emulsion.
Inventors
- 👤 Jonathan P. Kitchin
- 👤 Kevin P. Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:15
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/035; G03C1/06; G03C1/061; G03C2001/03564; G03C2200/00; G03C2200/06
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
128 words
A negative-acting photographic element comprising a support having coated thereon one or more layers of a radiation-sensitive silver halide emulsion, at least one of the layers containing a hydrazine compound characterized in that the one or more radiation-sensitive silver halide layers contain a first silver halide emulsion having an average grain size of from 0.to 0.4 microns and a second silver halide emulsion of particles with an average grain volume of less than one half that of the particles of the first emulsion, wherein one or more silver halide layers have a distribution of grains therein such that for the combined emulsions a plot of total volume of grain against grain size exhibits at least two distinct peaks, one peak lying in the range 0.1 to 0.4 microns.
Claim 2
Dependent Claim
128 words
A negative-acting photographic element comprising a support having coated thereon one or more layers of a radiation-sensitive silver halide emulsion, at least one of the layers containing a hydrazine compound characterized in that the one or more radiation-sensitive silver halide layers contain a first silver halide emulsion having an average grain size of from 0.to 0.4 microns and a second silver halide emulsion of particles with an average grain volume of less than one half that of the particles of the first emulsion, wherein one or more silver halide layers have a distribution of grains therein such that for the combined emulsions a plot of total volume of grain against grain size exhibits at least two distinct peaks, one peak lying in the range 0.1 to 0.4 microns.
Claim 3
Dependent Claim
38 words
An element as claimed in claim 1, characterised in that the particles of the second silver halide emulsion have an average grain volume of less than one quarter that of the particles of the first silver halide emulsion.
Claim 4
Dependent Claim
32 words
An element as claimed in claim 1, characterised in that the weight ratio of the first silver halide emulsion to the second silver halide emulsion is in the range 1:19 to 2:1.
Claim 5
Dependent Claim
23 words
An element as claimed in claim 1, characterised in that the first and second silver halide emulsions are present in a single layer.
Claim 6
Dependent Claim
22 words
An element as claimed in claim 1, characterised in that the first and second silver halide emulsions are present in adjacent layers.
Claim 7
Dependent Claim
22 words
An element as claimed in claim 1, characterised in that the first and second silver halide emulsions have the same crystal morphology.
Claim 8
Dependent Claim
18 words
An element as claimed in claim 1, characterised in that the first silver halide emulsion is spectrally sensitised.
Claim 9
Dependent Claim
67 words
An element as claimed in claim 1 characterised in that the hydrazine is a compound of the formula: R.sup.3 --NHNH--G--R.sup.4 (II) in which: R 3 represents an aromatic or aliphatic group, R 4 represents a hydrogen atom or an alkyl, aryl, alkoxy or aryloxy group, any of which groups may be substituted, and G represents a carbonyl, sulphonyl, sulphoxy, phosphoryl or an N-substituted or un-substituted amino group.
Claim 10
Dependent Claim
83 words
An element as claimed in claim 8 characterised in that R 3 is an aliphatic group containing 1 to 30 carbon atoms, an unsaturated heterocyclic group or a monocyclic or dicyclic aryl group, each of which groups may be substituted, R 4 represents a monocyclic or dicyclic aryl group, an alkyl group containing 1 to 4 carbon atoms, an alkoxy group containing 1 to 8 carbon atoms or a monocyclic aryloxy group, each of which groups may be substituted and G is carbonyl.
Claim 11
Dependent Claim
83 words
An element as claimed in claim 1, characterised in that the hydrazine compound has the general formula: ##STR3## in which: n is 0 or an integer of 1 to 5, each R 5 may be the same or different and is selected from substituents such that the total Hammet sigma value of the R substituents is less than 0.3, and R 6 represents a hydrogen atom, an optionally substituted phenyl group or an optionally substituted alkyl group containing 1 to 10 carbon atoms.
Claim 12
Dependent Claim
30 words
A photographic process which comprises imagewise exposing a photographic element as claimed in claim 1 followed by developing the element in a developer solution having a pH greater than 9.5.
Claim 13
Dependent Claim
32 words
An element as claimed in claim 2, characterised in that the weight ratio of the first silver halide emulsion to the second silver halide emulsion is in the range 1:19 to 2:1.
Claim 14
Dependent Claim
55 words
An element as claimed in claim 2, characterised in that the one or more silver halide layers have a distribution of grains therein such that for the combined emulsions a plot of total volume of grain against grain size exhibits at least two distinct peaks, one peak lying in the range 0.1 to 0.4 microns.
Claim 15
Dependent Claim
55 words
An element as claimed in claim 3, characterised in that the one or more silver halide layers have a distribution of grains therein such that for the combined emulsions a plot of total volume of grain against grain size exhibits at least two distinct peaks, one peak lying in the range 0.1 to 0.4 microns.
Claim 16
Dependent Claim
23 words
An element as claimed in claim 12, characterised in that the first and second silver halide emulsions are present in a single layer.
Claim 17
Dependent Claim
23 words
An element as claimed in claim 14, characterised in that the first and second silver halide emulsions are present in a single layer.
Claim 18
Dependent Claim
18 words
An element as claimed in claim 2, characterised in that the first silver halide emulsion is spectrally sensitised.
Claim 19
Dependent Claim
18 words
An element as claimed in claim 14, characterised in that the first silver halide emulsion is spectrally sensitised.
Claim 20
Dependent Claim
18 words
An element as claimed in claim 16, characterised in that the first silver halide emulsion is spectrally sensitised.
References Cited (Backward Citations)
US2410690A
Cited
GB1342687A
Cited
US4168977A
Cited
US4201841A
Cited
US4269929A
Cited
JPS5758137A
Cited
US4444865A
Cited
US4547458A
Cited
US4639410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-24 | 1991-11-23 | 1992-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-24 | 1995-11-23 | 1996-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-24 | 1999-11-23 | 2000-05-24 | $7700.00 | Window Closed / Lapsed |