Noble Metal Or Compound Thereof Patents (Class 430/605)
  • Patent number: 6159679
    Abstract: A photosensitive image-forming element comprising on a support at least one photosensitive layer containing silver halide crystals internally doped in the center of the crystal volume with a transition metal complex while satisfying equation (I):0<FORM<10.sup.+5 (I)where ##EQU1## and where d.sub.1 represents a spherical equivalent diameter (SED), expressed in .mu.m, corresponding with a central crystal part doped with the said transition metal complex, d expressed in .mu.m represents the SED of the whole crystalvolume, while Q represents the concentration of the transition metal complex, expressed in 10.sup.-9 mole per mole of silver halide and wherein the said transition metal complex has the following general formula (1):[MX.sub.n Y.sub.m L.sub.q ].sup.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: December 12, 2000
    Assignee: Agfa-Gevaert, N.V.
    Inventor: Dirk Vandenbroucke
  • Patent number: 6159677
    Abstract: A monodispersed silver halide emulsion has an average silver iodide content of 1 to 20 mol %, an average equivalent sphere diameter of 0.1 to 0.6 .mu.m, and 60% or more of the total projected area of all the grains in the emulsion are occupied by tabular silver halide grains each having principal planes composed of {100} faces in an amount of 80% or more based on the total surface area of each grain.
    Type: Grant
    Filed: May 29, 1998
    Date of Patent: December 12, 2000
    Assignee: Fuji Photo Film, Co., Ltd.
    Inventor: Nobuyuki Haraguchi
  • Patent number: 6114105
    Abstract: A high bromide {111} tabular grain emulsion is disclosed in which most of the tabular grains exhibit silver salt epitaxy at a single site. Most of the silver halide epitaxy sites contact an edge region of the tabular grains. These emulsions exhibit chemical sensitization by the epitaxy and surprising lower levels of desensitization by spectral sensitizing dyes.
    Type: Grant
    Filed: April 13, 1999
    Date of Patent: September 5, 2000
    Assignee: Eastman Kodak Company
    Inventors: Thomas B. Brust, Bernard D. Stich
  • Patent number: 6107018
    Abstract: A radiation-sensitive emulsion is disclosed comprised of silver halide grains (a) containing greater than 50 mole percent chloride, based on silver, (b) having greater than 50 percent of their surface area provided by {100} crystal faces, and (c) having a central portion accounting for from 95 to 99 percent of total silver and containing two dopants selected to satisfy each of the following class requirements: (i) a hexacoordination metal complex which satisfies the formula (I)[ML.sub.6 ].sup.nwherein n is zero, -1, -2, -3 or -4; M is a filled frontier orbital polyvalent metal ion, other than iridium; and L.sub.6 represents bridging ligands which can be independently selected, provided that least four of the ligands are anionic ligands, and at least one of the ligands is a cyano ligand or a ligand more electronegative than a cyano ligand; and (ii) an iridium coordination complex containing a thiazole or substituted thiazole ligand.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: August 22, 2000
    Assignee: Eastman Kodak Company
    Inventors: Jerzy Z. Mydlarz, Eric L. Bell, Michael S. Graham
  • Patent number: 6093529
    Abstract: An imaging material is provided in the form of a photothermographic or thermographic image forming layer containing an organic silver salt on one surface of a support and further comprising a polyvalent metal ion and a phthalic acid compound on the image forming layer-bearing surface of the support. The imaging material has improved shelf stability before and after image formation and the ease of handling and produces high-quality blue black tone images.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: July 25, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hirohiko Tsuzuki, Hisashi Okamura, Itsuo Fujiwara, Yoshiharu Yabuki, Masaki Noro
  • Patent number: 6083680
    Abstract: A photothermographic material for a photomechanical process which is high in sensitivity and high in contrast and can provide an image low in Dmin by UV light, comprising a support having provided thereon a light-insensitive organic silver salt, a light-sensitive silver halide formed independently of the light-insensitive organic silver salt, and a binder, wherein the main binder of an image formation layer containing the light-sensitive silver halide is a polymer latex having a glass transition-temperature of 40.degree. C. or less, said image formation layer is formed by applying a coating solution in which 60% by weight or more of a solvent is water, and the light-sensitive silver halide is gold-sensitized silver halide grains having a silver chloride content of 80 mol % or more per silver halide.
    Type: Grant
    Filed: August 14, 1998
    Date of Patent: July 4, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadashi Ito, Kazuki Yamazaki
  • Patent number: 6083678
    Abstract: A method has been described for preparing a light-sensitive silver halide photographic emulsion comprising performing at least three distinct precipitation steps in an aqueous medium into a reaction vessel, followed by desalting by means of flocculation and washing or by means of ultrafiltration, said emulsion comprising a colloidally stabilizing binder and {100} tabular silver halide grains containing at least 50 mole % of silver chloride, wherein at least 60% by number of all grains is provided by said tabular grains, and wherein said tabular grains exhibit an average aspect ratio of at least 2, an average thickness of at most 0.25 .mu.m with a variation coefficient of at most 0.25, and an average equivalent circular crystal diameter of 0.3 .mu.m or more with a variation coefficient of at most 0.
    Type: Grant
    Filed: October 9, 1998
    Date of Patent: July 4, 2000
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Peter Verrept, Jan Cuypers
  • Patent number: 6060231
    Abstract: A negative-acting photothermographic element comprises a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer that contains photosensitive silver halide grains doped with iridium and copper; a non-photosensitive, reducible source of silver; a reducing agent for the non-photosensitive, reducible source of silver; and a binder. A process of forming photothermographic emulsions from doped silver halide grains by forming silver soaps in the presence of those grains is also described.
    Type: Grant
    Filed: March 22, 1999
    Date of Patent: May 9, 2000
    Assignee: Eastman Kodak Company
    Inventor: Chaofeng Zou
  • Patent number: 6043020
    Abstract: A silver halide color photographic material is disclosed which comprises a support having provided thereon at least one silver halide emulsion layer containing a yellow dye-forming coupler, at least one silver halide emulsion layer containing a magenta dye-forming coupler, and at least one silver halide emulsion layer containing a cyan-dye forming coupler, wherein at least one of said at least one emulsion layers (i) contains silver chloride or silver chlorobromide emulsion grains having a silver chloride content of 95 mol % or more and substantially free of silver iodide, and (ii) has a ratio of point gamma I to point gamma II of 0.7 to 1.3, wherein when points giving densities of 1.0 and 1.5 on a characteristic curve obtained by an exposure time of 10.sup.-4 second are joined by a straight line, point gamma I is a point gamma on the characteristic curve, at a density which is 1.5 or more and which satisfies the condition where the value of logE on the characteristic curve is larger by 0.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: March 28, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Shigeaki Ohtani
  • Patent number: 6030763
    Abstract: A process for reduction-sensitizing a silver halide photographic emulsion is disclosed, comprising reduction-sensitizing a silver halide basis grain having a silver bromide content of 75 mol % or more and thereafter or at the same time, depositing silver halide having a silver chloride content of 50 mol % or more on the surface of said basis grain not to have a distinct epitaxial form. Further disclosed is a silver halide photographic light-sensitive material containing a silver halide emulsion prepared by the process.
    Type: Grant
    Filed: April 14, 1998
    Date of Patent: February 29, 2000
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Hiroyuki Mifune
  • Patent number: 5998083
    Abstract: An image-forming system for radiological imaging is disclosed said system consisting of an intensifying screen comprising on a support at least one layer of a green-light emitting phosphor and, in operative association therewith, a prehardened light-sensitive photographic silver halide film material, comprising a support and on both sides thereof one or more hydrophilic colloid layers, said layers being hardened to such an extent that their swelling degree is reduced to less than 200% after immersing said material for 2 minutes in demineralised water of 35.degree. C.; further comprising in at least one of said hydrophilic layers chemically ripened, monodisperse essentially cubic silver chloroiodide grains having a mean crystal diameter of from 0.40 mm up to 0.65 mm; wherein said grains have been spectrally sensitised in the wavelength range between 520 and 580 nm, have a maximum absorption between 540 and 500 nm and have been coated in a total amount of silver per sq.m.
    Type: Grant
    Filed: February 24, 1998
    Date of Patent: December 7, 1999
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Ann Verbeeck, Freddy Henderickx, Dirk Vandenbroucke, Peter Verrept
  • Patent number: 5989797
    Abstract: A light-sensitive silver halide photographic material and a method for preparing said material is provided, wherein said material comprises a support and on one or both sides thereof at least one silver halide emulsion layer and a protective antistress layer as an outermost layer, characterized in that said silver halide emulsion layer(s) and/or said protective antistress layer comprise(s) at least one zeolite loaded with a photographically useful group. Said photographically useful group is a soluble salt, an organic compound releasing chloride, bromide or iodide, a sulfur salt, a selenium salt, a tellurium salt and/or a metal salt of group VIII.
    Type: Grant
    Filed: October 7, 1998
    Date of Patent: November 23, 1999
    Assignee: Agfa-Gevaert, N.V.
    Inventor: Hubert Vandenabeele
  • Patent number: 5989795
    Abstract: This invention relates to a photographic recording material comprising a support and a photosensitive chemically sensitized silver halide emulsion layer, containing a sensitizing dye selected from the group consisting of oxonal dyes, merocyanine dyes, and cyanine dyes having a net negative charge, and which has a pH value between about 2 to about 5 and a pAg value between about 1 to about 4.7.
    Type: Grant
    Filed: May 21, 1992
    Date of Patent: November 23, 1999
    Assignee: Eastman Kodak Company
    Inventors: Francis John Evans, Arthur Herman Herz
  • Patent number: 5985536
    Abstract: A photosensitive element is disclosed comprising on at least one side of a support one or more silver halide emulsion layers and a non-light sensitive hydrophilic colloidal layer characterized in that at least one emulsion layer comprises silver halide crystals having an oligomeric platinum complex containing only carbonyl ligands, which is represented by formula (1):[Pt.sub.3 (CO).sub.6 ].sub.n.sup.2- (1)wherein n is not more than 10.The invention also provides a method for the preparation of a photosensitive element as described hereinbefore comprising the step of introducing the oligomeric platinum carbonyl containing complex as represented by formula (1) during grain formation in at least one silver halide emulsion.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: November 16, 1999
    Assignee: Agfa-Gevaert, N. V.
    Inventors: Rene De Keyzer, Mona Treguer, Jacqueline Belloni-Cofler, Hynd Remita
  • Patent number: 5985508
    Abstract: A silver halide photographic material is disclosed, comprising a support having thereon at least one silver halide emulsion layer, wherein said emulsion layer contains a heavy metal selected from Ir, Ru, Rh, Re and Cr in an amount of at least 1.times.10.sup.-5 mol per mol of silver halide and (1) silver halide grains having a silver chloride content of 95 mol % or more, said grains being formed under acidic conditions and then subjected to gold-sulfur sensitization, (2) a silver halide having a silver chloride content of 95 mol % or more and then subjected to Se or Te sensitization or (3) silver halide grains having a silver chloride content of 95 mol % or more and conatianing at least one iron compound, and at least one of said emulsion layer and other hydrophilic colloid layers contains at least one hydrazine derivative and at least one nucleation accelerator. Also, disclosed is a method for producing the above-described silver halide photographic material.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: November 16, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tadashi Ito, Takahiro Goto, Shoji Yasuda
  • Patent number: 5981138
    Abstract: A hydrazine compound represented by the following formula (I):Ar.sub.1 --NH--NH--G.sub.1 --R.sub.1 (I)wherein Ar.sub.1 represents an aromatic group; G.sub.1 represents a carbonyl group, a sulfonyl group, a sulfoxy group, a phosphoryl group, an oxalyl group or an iminomethylene group; R.sub.1 represents a hydrogen atom or a block group; and at least one of Ar.sub.1 and R.sub.1 has a group represented by the following formula (II): ##STR1## wherein * represents a bond for connecting directly or through a liking group to Ar.sub.1 or R.sub.1 ; Z represents a nonmetallic atom group capable of forming a 5- or 6-membered unsaturated heterocyclic ring having a conjugated positive charge; and X.sup.- represents --O.sup.-, --S.sup.- or --N.sup.- --R.sub.2, wherein R.sub.2 represents an alkyl group, an alkenyl group, an alkynyl group, an aryl group or a heterocyclic group. Also disclosed is a silver halide photographic light-sensitive material containing the hydrazine compound.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: November 9, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Suzuki, Kohzaburoh Yamada, Hiroshi Takeuchi, Toshihide Ezoe, Takashi Hoshimiya
  • Patent number: 5981161
    Abstract: A silver halide photographic light sensitive material is diclosed, comprising a support having a silver halide emulsion layer containing cubic silver halide grains containing iodide of 0.1 to 1.0 mol % and an iridium salt of 1.times.10.sup.-8 to 1.times.10.sup.
    Type: Grant
    Filed: June 20, 1997
    Date of Patent: November 9, 1999
    Assignee: Konica Corporation
    Inventor: Yuji Hosoi
  • Patent number: 5972588
    Abstract: There is disclosed a silver halide photographic emulsion, which comprises silver halide tabular grains that have {100} planes as principal planes and have the following features, the emulsion being subjected to chemical sensitization: (a) 50% or more of the projected areas of the tabular grains is attributed to tabular grains having an aspect ratio of 2 or more, (b) each of the tabular grains has a mixed crystal region containing, in addition to main halide ions, different halide ions in an amount of 0.01 mol % or more, but 25 mol % or less, in the nucleus part and/or in part of the growth part or in the whole of the grown part, and (c) when the principal planes of the tabular grains are observed using a transmission-type electron microscope, one or more, but ten or less, dislocation lines are observed on the principal planes of each grain of 50% or more of the tabular grains.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: October 26, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Toshiyuki Nabeta
  • Patent number: 5962210
    Abstract: The invention relates to a photographic emulsion comprising silver iodochloride grains, said grains further comprising iridium, said grains chemically sensitized with gold in an amount of between 120 and 200 mg gold per silver mole and sulfur in an amount between 0.1 and 20 mg sulfur per silver mole, 1-(3-acetamidophenyl)-5-mercaptotetrazole, 1-phenyl-5-mercaptotetrazole, and a disulfide compound represented by the following formula: ##STR1## wherein X is independently --O--, --NH-- or --NR--, where R is a substituent;m and r are independently 0, 1 or 2;X is --H or a cationic species;Ar is an aromatic group; andL is a linking group, where p is 0 or 1.
    Type: Grant
    Filed: January 12, 1998
    Date of Patent: October 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: Paul T. Hahm, Alberto M. Martinez, Melvin M. Kestner, Eric L. Bell, Walter H. Isaac
  • Patent number: 5955252
    Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer containing silver halide grains having a silver chloride content of at least 70 mol % and containing a transition metal selected from the group consisting of elements belonging to Groups V to VIII of the Periodic Table in an amount of at least 1.times.10.sup.-7 mol per mol of silver, the silver halide grains being formed in the presence of a compound represented by following formula (I); ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represents a hydrogen atom, an alkyl group, an aryl group, an amino group, a hydroxy group, an alkoxy group, an alkylthio group, a carbamoyl group, a halogen atom, a cyano group, a carboxy group, an alkoxycarbonyl group, or a heterocyclic residue; and R.sup.1 and R.sup.2 or R.sup.2 and R.sup.3 may combine with each other and form a 5-membered or 6-membered ring; and with the proviso that at least one of R.sup.
    Type: Grant
    Filed: September 28, 1994
    Date of Patent: September 21, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takahiro Goto, Nobuaki Inoue
  • Patent number: 5945270
    Abstract: This invention relates to a silver halide photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising an organomercapto Au(I) complex having the formula?(M--SOL).sub.n --A--S--Au--S--A--(SOL--M).sub.n !Mwherein M is a cationic counterion;SOL is a solubilizing group:A is a substituted or unsubstituted divalent organic linking group;and n is 1 to 4 and wherein the compound is symmetrical.It further relates to a method of preparing a silver halide emulsion utilizing said organomercapto Au(I) complexes.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: August 31, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Weimar W. White, Brian P. Cleary
  • Patent number: 5945269
    Abstract: The present invention provides an emulsion of high silver chloride content tabular silver halide grains with {100} planes as main planes having an excellent color sensitizability, gradation and preservability which can be quickly processed and a photographic light-sensitive material comprising such an emulsion. A novel silver halide emulsion is provided, comprising tabular silver halide grains having {100} planes as two main parallel planes, an aspect ratio of from not less than 2 to not more than 15, a silver chloride content of not less than 60 mol % and a silver salt present on the surface thereof more difficultly-soluble than silver chloride, in a proportion of not less than 50% of all the silver halide grains contained therein as calculated in terms of projected area.
    Type: Grant
    Filed: December 5, 1995
    Date of Patent: August 31, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Masaharu Nakatsu
  • Patent number: 5939245
    Abstract: This invention relates to a silver halide photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising a Au(I) compound having the formula wherein Z is a substituted or unsubstituted alkyl, aryl, alkylaryl, or heterocyclic group; and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently substituted or unsubstituted alkyl, aryl, alkylaryl, or heterocyclic groups, or one or both of R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4, may independently combine to form a nitrogen containing ring with the nitrogen to which they are attached.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: August 17, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Weimar W. White, Melanie W. Marshall
  • Patent number: 5928852
    Abstract: A silver halide photographic emulsion is disclosed, comprising a support having thereon at least one silver halide emulsion layer, wherein the silver halide grain contained in the silver halide emulsion layer has a silver chloride content of 50 mol % or more, 30% or more of the surface area of the grain comprises a (111) face, and the silver halide grain is formed in the presence of at least one compound represented by formula (I) and contains a hexacyano complex represented by formula (II) such that the outermost layer of the grain has a hexacyano complex concentration of at least 1.times.10.sup.-4 mol/mol-Ag.
    Type: Grant
    Filed: October 10, 1996
    Date of Patent: July 27, 1999
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Katsuhisa Ohzeki
  • Patent number: 5922525
    Abstract: A silver halide photographic material having improved heat sensitivity comprises a red sensitive silver halide emulsion layer the silver halide of which is prepared in the presence of a hexacoordination complex of rhenium, ruthenium or osmium with at least four cyanide ligands and comprising at least about 90 mole percent silver chloride, wherein the emulsion contains a thiosulfonate and a sulfinate or seleninate and at least one red sensitizing dye.
    Type: Grant
    Filed: April 8, 1996
    Date of Patent: July 13, 1999
    Assignee: Eastman Kodak Company
    Inventors: Richard Paul Garnsey, Pamela McCue Ferguson, Richard Lee Parton, Paul Timothy Hahm
  • Patent number: 5912112
    Abstract: A photographic element comprising a support having situated thereon a silver halide emulsion layer, said emulsion layer comprising a compound of the formula:Z--S--Au(I)--S--Q (I)whereinZ represents an alkyl, aryl, or heterocyclic group; andQ represents a heterocyclic group wherein S and Q together represent a mesoionic group.
    Type: Grant
    Filed: March 5, 1998
    Date of Patent: June 15, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Weimar W. White, Melanie W. Marshall
  • Patent number: 5912111
    Abstract: This invention relates to a silver halide photographic element comprising a support and a silver halide emulsion layer, the emulsion layer comprising a Au(I) compound having the formula ##STR1## wherein Z is a substituted or unsubstituted alkyl, aryl, alkylaryl, or heterocyclic group; and R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are independently substituted or unsubstituted alkyl, aryl, alkylaryl, or heterocyclic groups, or one or both of R.sub.1 and R.sub.2 or R.sub.3 and R.sub.4, may independently combine to form a nitrogen containing ring with the nitrogen to which they are attached.
    Type: Grant
    Filed: February 18, 1998
    Date of Patent: June 15, 1999
    Assignee: Eastman Kodak Company
    Inventors: Roger Lok, Weimar W. White, Melanie W. Marshall
  • Patent number: 5910402
    Abstract: A photosensitive element which comprises a support, at least one silver halide emulsion layer and at least a non-light sensitive hydrophilic colloidal layer, wherein the silver halide emulsion layer comprises a selenium compound represented by formula (1): ##STR1## wherein: Q represents R.sup.1 SO.sub.2 or R.sup.2 R.sup.3 P=X;each of R.sup.1, R.sup.2 and R.sup.3 the same or different represents OR.sup.4, NR.sup.5 R.sup.6, SR.sup.7, SeR.sup.8 an alkyl group, an aryl group or a heteroaryl group;X represents O, S or Se;each of R.sup.4, R.sup.5, R.sup.6, R.sup.7 and R.sup.8 the same or different represents hydrogen, an alkyl group, an aryl group or a heteroaryl group, or R.sup.5 and R.sup.6 together represents the atoms necessary to form a N-containing ring.The invention also provides a method for the preparation of a photosensitive element as disclosed hereinbefore comprising the step of chemically sensitizing at least one of the silver halide emulsions by means of a selenium compound as defined.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: June 8, 1999
    Assignee: AGFA-Gevaert, N.V.
    Inventors: Rene De Keyzer, Johan Loccufier, Kathy Elst
  • Patent number: 5906914
    Abstract: A silver halide light sensitive photographic material is disclosed, comprising a support having thereon a silver halide emulsion layer containing tabular grains having an aspect ratio of not less than 5 and an even number of parallel twin planes, the tabular grains further satisfying the following requirements:(A) a coefficient of variation of grain size being 20% or less,(B) 0.7.ltoreq.y/x.ltoreq.2.0, where x represent a coefficient of variation of twin plane spacing and y represents a coefficient of variation of grain thickness, and (C) the grains having, in the interior of the grain, an internal layer having an iodide content higher than that of the grain surface, and the iodide content of the grain surface being higher than an average overall iodide content of the grains.
    Type: Grant
    Filed: January 14, 1998
    Date of Patent: May 25, 1999
    Assignee: Konica Corporation
    Inventors: Kumiko Taguchi, Sadayasu Ishikawa
  • Patent number: 5902721
    Abstract: When a color negative film is developed in 2 minutes or less at a temperature of less than 40.degree. C. and contains in overlying blue and green recording layer units high bromide silver halide grains containing from 1 to 10 mole percent iodide, based on silver, and in an underlying red recording layer unit high bromide silver halide grains containing less than 0.05 mole percent iodide, based on silver, and at least 1.times.10.sup.-6 mole per silver mole of a hexacoordination complex of a Group 8 metal and coordination ligands, at least four of the ligands being anionic and at least one of the ligands being more electronegative than halide ligands, loss of lower scale contrast in the red record attributable to the faster time of development is avoided.
    Type: Grant
    Filed: February 17, 1998
    Date of Patent: May 11, 1999
    Assignee: Eastman Kodak Company
    Inventors: John H. Becher, Roger A. Bryant
  • Patent number: 5888717
    Abstract: A photosensitive silver halide emulsion which is ripened with at least one compound of the formula (I)R.sub.1 --X--R.sub.2 (I)in whichR.sub.1 and R.sub.2 mutually independently mean groups which are linked to X via an element from periods 3 to 6 of main group 4 or 5 or via an element from sub-groups 4 to 8 of the periodic system of elements, wherein R.sub.1 and R.sub.2 may be attached together via a linking member and wherein the bonds R.sub.1 --X and R.sub.2 --X may mutually independently be single or double bonds, andX means Se or Te,is distinguished by elevated sensitivity, low grain and low fog.
    Type: Grant
    Filed: November 14, 1997
    Date of Patent: March 30, 1999
    Assignee: Agfa-Gevaert AG
    Inventors: Peter Bergthaller, Hans-Ulrich Borst, Jorg Siegel
  • Patent number: 5858637
    Abstract: A process of preparing a photothermographic composition of enhanced photosensitivity is disclosed comprised of (a) precipitating light-sensitive silver halide grains in the presence of a non-aqueous polymeric peptizer and (b) then combining the silver halide grains with an oxidation-reduction image-forming combination comprised of an organic silver compound and a reducing agent for the silver organic compound. Light-sensitivity of the silver halide grains is enhanced by, prior to step (b), sensitizing the silver halide grains with a gold sensitizer dissolved in an aqueous medium.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: January 12, 1999
    Assignee: Eastman Kodak Company
    Inventors: Lyn M. Eshelman, Mark E. Irving, David H. Levy, Kathleen R. C. Gisser
  • Patent number: 5856077
    Abstract: A mammographic medical diagnostic radiographic element is disclosed that produces sharp images and is capable of being processed in less than 60 seconds. Each of imaging and antihalation fully forehardened hydrophilic colloid layer units are coated on the opposite sides of a transparent film support at a hydrophilic colloid coating coverage of less than 55 mg/dm.sup.2. The radiation-sensitive silver halide grains contained in the imaging layer unit are provided by a tabular grain emulsion coated at a coverage capable of providing a maximum density on processing of greater than 3.6. To provide a mid-scale contrast of greater than 3.0 and a lower scale contrast of greater than 2.2, the radiation-sensitive grains (a) exhibit an equivalent circular diameter coefficient of variation grain of less than 15 percent and (b) contain rhodium in a normalized molar concentration of less than 1.times.10.sup.-6 based on silver.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: January 5, 1999
    Assignee: Eastman Kodak Company
    Inventors: Robert E. Dickerson, Patrick M. Jeffries, Marcia K. Hansen
  • Patent number: 5853967
    Abstract: A mammographic medical diagnostic radiographic element is disclosed having emulsion layers coated on opposite surfaces of a transparent film support. To facilitate rapid processing the emulsion layers are fully forehardened and less than 35 mg/dm.sup.2 of hydrophilic colloid is coated on each major surface. To reduce crossover and hydrophilic colloid, emulsions on the opposite sides of the support are each divided into two layers with the layer coated nearest the support containing a particulate dye capable of being decolorized during processing. Particulate dye and silver halide grains together account for between 30 and 70 percent of the total weight of the emulsion layers. Combined with the use of spectrally sensitized tabular grain emulsions crossover can be reduced to less than 15 percent while processing can be completed in less than 45 seconds. The distribution of hydrophilic colloid and silver halide grains chosen achieves low wet pressure sensitivity.
    Type: Grant
    Filed: May 21, 1998
    Date of Patent: December 29, 1998
    Assignee: Eastman Kodak Company
    Inventor: Robert E. Dickerson
  • Patent number: 5851751
    Abstract: A silver halide emulsion of average grain size 0.2 .mu.m or less comprising silver halide grains having a core and an outer shell, the core comprising at least 85 mol % of the total silver halide content of the grain and at least 50 mol % of the silver halide in the core being silver bromide, and the outer shell comprising silver halide of which greater than 50 mol % is silver chloride; the emulsion either containing no rhodium dopant, or containing rhodium dopant such that the concentration of said dopant is at least as great in the core as in the shell.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: December 22, 1998
    Assignee: Imation Corp.
    Inventors: Julian M. Wallis, Robert J. D. Nairne, Alexis Zinn-Warner
  • Patent number: 5840473
    Abstract: The invention relates to a photographic element comprising at least two photographic emulsions wherein the grains of said at least two emulsions are the same and wherein at least one of said at least two emulsions is treated with a speed decreasing compound of Formula I:Z.sup.1 --X.sup.1 O.sub.2 S--M.sup.1 (I)and a compound of Formula II:Z.sup.2 --X.sup.2 O.sub.x --M.sup.2 (II)wherein X.sup.1 is sulfur and X.sup.2 is selected from the group consisting of sulfur and selenium, M.sup.1 and M.sup.2 are independently selected from group consisting of a metal ion and ##STR1## wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are independently selected from the group consisting of hydrogen and an alkyl of 1-3 carbon atoms, and Z.sup.1 and Z.sup.
    Type: Grant
    Filed: April 23, 1997
    Date of Patent: November 24, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jerzy Z. Mydlarz, Roger L. Klaus, Frederick C. Derks
  • Patent number: 5830631
    Abstract: The invention relates to a photographic emulsion comprising silver iodochloride grains, said grains further comprising osmium and ruthenium, said grains chemically sensitized with gold in an amount of between 0.1 and 120 mg gold per silver mole and sulfur in an amount between 0.1 and 20 mg sulfur per silver mole and a disulfide compound represented by the following formula: ##STR1## wherein X is independently --O--, --NH-- or --NR--, where R is a substituent;m and r are independently 0, 1 or 2;M is --H or a cationic species;Ar is an aromatic group; andL is a linking group, where p is 0 or 1.
    Type: Grant
    Filed: October 11, 1996
    Date of Patent: November 3, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jess B. Hendricks, Jerzy A. Budz, Paul T. Hahm
  • Patent number: 5821044
    Abstract: A spectrally sensitised photographic silver halide emulsion which is super-sensitised with an aromatic complex having a central transition metal atom which is present in a valence state which is not the highest possible for the metal concerned and which complex contains at least one non-aromatic complex ligand, is distinguished by increased sensitivity.
    Type: Grant
    Filed: July 17, 1997
    Date of Patent: October 13, 1998
    Assignee: Agfa-Gevaert Aktiengesellschaft
    Inventors: Peter Bergthaller, Jorg Siegel, Hans-Ulrich Borst, Michael Missfeldt
  • Patent number: 5814439
    Abstract: In a silver halide color photographic photo-sensitive material comprising a reflective support having thereon photographic structural layers comprising one or more silver halide emulsion layers, pH of a coating of the silver halide color photographic photo-sensitive material ranges from 4.0 to 6.5 and at least one of the silver halide emulsion on layers contains at least one mercapto heterocyclic compound and tabular silver halide grains having {100} planes was main planes and having a silver chloride content of not less than 80 mol %, the silver halide grains containing at least one selected from the group consisting of metal complexes of Fe, Ru, Re, Os, Rh and Ir.
    Type: Grant
    Filed: October 29, 1996
    Date of Patent: September 29, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Naoto Ohshima, Mitsuo Saitou
  • Patent number: 5814436
    Abstract: The present invention provides a processing method which allows a silver halide color photographic material to be sufficiently desilvered and minimizes the rise in the formation of bleaching fog or stain even when it is processed in a short period of time. A novel process for the processing of a silver halide color photographic material comprising at least silver halide emulsion layer on a support which comprises subjecting the silver halide color photographic material to color development, and then processing the silver halide color photographic material with a processing solution having a bleaching capacity is provided, characterized in that said emulsion layer comprises tabular silver halide grains having ?100! major faces and a silver chloride content of 50 to 100 mol % and said processing solution having a bleaching capacity contains at least one ferric complex salt of a compound represented by the following general formula (I): ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5 and R.sub.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: September 29, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Takatoshi Ishikawa
  • Patent number: 5807667
    Abstract: The invention is generally accomplished by a method of sensitizing comprising providing tabular silver bromoiodide grains or bromoiodide grains doped with Se and Iridium bringing said grains into contact with a benzothiazolium salt or hydrolyzed benzothiazolium salt comprising ##STR1## wherein R.sub.1 is hydrogen, alkyl of from 1 to 8 carbon atoms, or aryl of from 6 to 10 carbon atoms,R.sub.4 and R.sub.5 are independently hydrogen or halogen atoms, aliphatic or aromatic hydrocarbon moieties optionally linked through a divalent oxygen or sulfur atom; or cyano, amino, amido, sulfonamido, sulfamoyl, ureido, thioureido, hydroxy, --C(O)M, or --S(0).sub.2 M groups, wherein M is chosen to complete an aldehyde, ketone, acid, ester, thioester, amide, or salt;Y.sub.1 is a charge balancing counter ion; andQ is a substituent of the formula:--LCONHS0.sub.2 R, --LCONHS0.sub.2 NHCOR alkyl, sulfoalkyl, phosphoalkyl, hydroxyalkyl, or L--CONH.sub.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: September 15, 1998
    Assignee: Eastman Kodak Company
    Inventor: Elizabeth Pui-lu Chang
  • Patent number: 5792601
    Abstract: A radiation sensitive emulsion is disclosed containing iridium doped composite silver halide grains comprised of (a) host portions having an average aspect ratio of less than 1.3 and consisting essentially of monodisperse silver iodochloride grains containing from 0.05 to 3 mole percent iodide, based on total silver forming the host portions, with maximum iodide concentrations located nearer the surface of the host portions than their center and (b) epitaxially deposited portions containing the iridium dopant and silver bromide accounting for from 0.1 to 5 mole percent of total silver forming the composite grains.The emulsions are prepared by (a) first providing an emulsion containing grains which form the host portions of the grains and (b) modifying the performance properties of the host grains by a combination of silver bromide addition, iridium dopant incorporation and antifoggant addition, in which, prior to antifoggant addition, silver bromide in the amount of from 0.1 to 5.
    Type: Grant
    Filed: July 29, 1996
    Date of Patent: August 11, 1998
    Assignee: Eastman Kodak Company
    Inventors: James Lawrence Edwards, Benjamin Teh-Kung Chen, Eric Leslie Bell, Roger Lok
  • Patent number: 5783372
    Abstract: The invention relates to a photographic element for digital exposure comprising at least one layer comprising an emulsion of cubic silver iodochloride grain wherein said grain has been sensitized with a gold compound and with less than 1 .mu.mole per silver mole of sulfur.
    Type: Grant
    Filed: February 14, 1996
    Date of Patent: July 21, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jerzy Antoni Budz, Jerzy Mydlarz, Benjamin Teh-Kung Chen, James Lawrence Edwards
  • Patent number: 5783373
    Abstract: An electronic printing method is disclosed which comprises subjecting a radiation sensitive silver halide emulsion layer of a recording element to actinic radiation of at least 10.sup.-4 ergs/cm.sup.2 for up to 100.mu. seconds duration in a pixel-by-pixel mode. The silver halide emulsion layer is comprised of grains predominantly bounded by {100} crystal faces and internally containing three dopants each selected to satisfy a different one of the following class requirements: (i) a metal coordination complex containing a nitrosyl or thionitrosyl ligand in combination with a transition metal chosen from groups 5 to 10 inclusive of the periodic table of elements, (ii) a shallow electron trapping dopant, and (iii) a iridium coordination complex having ligands each of which are more electropositive than a cyano ligand. A gelatino-peptizer for the grains is employed that contains less than 30 micromoles of methionine per gram.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: July 21, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jerzy Z. Mydlarz, Jerzy A. Budz, Eric L. Bell
  • Patent number: 5783378
    Abstract: A radiation-sensitive high chloride emulsion is disclosed comprised of grains predominantly bounded by {100} crystal faces and internally containing three dopants each selected to satisfy a different one of the following class requirements: (i) a metal coordination complex containing a nitrosyl or thionitrosyl ligand in combination with a transition metal chosen from groups 5 to 10 inclusive of the periodic table of elements, (ii) a shallow electron trapping dopant, and (iii) an iridium coordination complex having ligands each of which are more electropositive than a cyano ligand. A gelatino-peptizer for the grains is employed that contains less than 30 micromoles of methionine per gram. The dopants and peptizer in combination increase contrast and provide a highly unexpected increase in high density contrast.
    Type: Grant
    Filed: October 30, 1996
    Date of Patent: July 21, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jerzy Z. Mydlarz, Jerzy A. Budz, Eric L. Bell
  • Patent number: 5783379
    Abstract: A silver halide photographic material for industrial radiography is disclosed comprising a film support and on one or both sides thereof at least one gelatino silver halide emulsion layer wherein each silver halide emulsion layer comprises as silver halide crystals silver chloride and/or silver chlorobromide crystals the amount of bromide therein being at most 25 mole %; has a gelatin to silver halide (expressed as silver nitrate) ratio from 2:10 to 6:10 and has an amount of silver halide corresponding to from 5 g to 15 g of silver per m.sup.2 and wherein said photographic material has been fore-hardened to such an extent that when it is immersed in demineralized water of 25.degree. C. for 3 minutes there is absorbed less than 2.5 g of water per gram of gelatin, characterized in that said silver chloride or silver chlorobromide emulsion crystals are chemically ripened in the presence of at least one sulphur compound and at least one gold compound, wherein gold is present in an amount from 0.01 to 1 .mu.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: July 21, 1998
    Assignee: Agfa-Gevaert, N.V.
    Inventors: Peter Willems, Freddy Henderickx
  • Patent number: 5773208
    Abstract: The invention relates to an emulsion comprising silver halide grains, said grains being tabular and comprising sensitizing dye(s) and silver salt epitaxial deposits, and addenda that includea tetraazaindene and a hexose reductone represented by Formula I: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different, and may represent H, alkyl, cycloalkyl, aryl, or an alkyl group with a solubilizing group such as --OH, sulfonamide, sulfamoyl, or carbamoyl. Alternatively, R.sub.1 and R.sub.2 may be joined to complete a heterocyclic ring such as aziridinyl, azetidinyl, pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, or pyridinyl, R.sub.4 and R.sub.5 are H, OH, alkyl, aryl, cycloalkyl, or may together represent an alkylidene group, n is 0,1, or 2 and R.sub.3 is H, alkyl, aryl, or CO.sub.2 R.sub.6 where R.sub.6 is alkyl.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: June 30, 1998
    Assignee: Eastman Kodak Company
    Inventors: Jeffrey L. Hall, James H. Reynolds
  • Patent number: 5766837
    Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer containing silver halide grains, wherein the silver halide grains has been gold and chalcogen sensitized, and the partition rate of the gold in the silver halide grain side is not less than 10% and less than 40%, and a method for producing the silver halide photographic material.
    Type: Grant
    Filed: July 18, 1995
    Date of Patent: June 16, 1998
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Tomoyuki Ozeki, Seiji Yamashita, Yuji Yoshida
  • Patent number: 5759761
    Abstract: The invention is generally accomplished providing a silver halide emulsion comprising silver halide grains and a gold compound represented by Formula I:{AuS.sub.2 X}.sub.nwhereinX is PR.sub.2 (dithiophosphinates), P(OR).sub.2 (dithiophosphates), COR (xanthates), CNR.sub.2 (dithiocarbamates), CR (dithiocarboxylates)R is alkyl or aryln=1-6.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: June 2, 1998
    Assignee: Eastman Kodak Company
    Inventors: Kenneth J. Lushington, Henry J. Gysling
  • Patent number: 5759760
    Abstract: The invention is generally accomplished by providing a method of chemical sensitization comprising providing a silver halide emulsion, and adding to the silver halide emulsion aqueous solid particle dispersion of a chemical sensitizing agent having a water and organic solvent insolubility (i.e., 50 mg/100 ml or less), and heating said emulsion wherein said chemical sensitizing agent comprises at least one member selected from the group consisting of gold compounds represented by Formula I:{AuS.sub.2 X}.sub.n IwhereinX is PR.sub.2 (dithiophosphinates), P(OR).sub.2 (dithiophosphates), COR (xanthates), CNR.sub.2 (dithiocarbamates), CR (dithiocarboxylates)R is alkyl or aryln=1-6,tellurium compounds represented by Formula II:TeL.sub.n X.sub.2whereinL is thiourea or substituted thiourea,n is 2 or 4,X is Cl, Br, I, OCN, SCN, SeCN, TeCN, or N.sub.3 andFormula IIA ##STR1## wherein X is COR, CSR, CNR.sub.2, CR, CAr, PR.sub.2, P(OR).sub.2, (PR.sub.2).sub.
    Type: Grant
    Filed: June 4, 1997
    Date of Patent: June 2, 1998
    Assignee: Eastman Kodak Company
    Inventors: Kenneth J. Lushington, John W. Boettcher, Henry J. Gysling