Including Manipulative Emulsification Step Patents (Class 430/569)
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Patent number: 5518871Abstract: A silver halide photographic material comprises a support and a light-sensitive layer provided thereon. The light-sensitive layer contains silver halide grains dispersed in gelatin. A hexa-coordinated cyano-complex is doped in the silver halide grains. The amount of the complex is in the range of 1.times.10.sup.-7 to 5.times.10.sup.-3 mol based on 1 mol of silver halide. A localized phase of the complex is present on the surface of the grains. The localized phase contains the complex in an amount of 1.times.10.sup.-5 to 1.times.10.sup.-1 mol based on 1 mol of silver halide. According to the present invention, the silver halide grains are doped in the presence of a compound having a function of inhibiting a reaction of the cyano-complex with gelatin, or the compound having the function is added to the grains after the grains are doped.Type: GrantFiled: August 22, 1994Date of Patent: May 21, 1996Assignee: Fuji Photo Film Co., Ltd.Inventor: Shigeharu Urabe
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Patent number: 5512426Abstract: Radiation sensitive emulsions are disclosed in which surface sensitized silver halide grains are agglomerated into discrete clumps and the clumps are separated by peptizer. The emulsions exhibit a higher sensitivity than emulsions in which grains of the same mean size are individually separated by peptizer.Type: GrantFiled: January 31, 1995Date of Patent: April 30, 1996Assignee: Eastman Kodak CompanyInventor: David H. Levy
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Patent number: 5503972Abstract: This invention describes the use of gelatin-grafted-polymer particles as peptizers for the preparation of silver halide photographic emulsions, whereby the gelatin-grafted-polymer particles remain attached to the AgX crystals after preparation of the emulsions. In an embodiment of this invention, the core polymer particles are loaded with photographically useful agents. When the photographic agent is a dye-forming coupler, multicolor mixed-packet systems can be constructed using the packet emulsions prepared in the manner of this invention.Type: GrantFiled: April 13, 1995Date of Patent: April 2, 1996Assignee: Eastman Kodak CompanyInventors: John D. Lewis, Mark A. Whitson, Thomas J. Dannhauser, Tienteh Chen, Pranab Bagchi
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Patent number: 5501939Abstract: The present invention provides a photographic material with a pH at 25.degree. C. of at most 7, containing on a support at least one layer, comprising a prefogged direct-positive silver halide emulsion spectrally sensitized with one or more electron-accepting sensitizing dyes in a total amount of at least 0.15 mmole/mole silver halide, the silver halide crystals of said prefogged direct-positive silver halide emulsion containing silver chloride for at least 60 mole %, silver bromide in a range from 0.5 mole % to 39.98 mole % and silver iodide in a range from 0.02 mole % to 2 mole %, characterized in that said silver halide cristals contain silver iodide for at least 0.20 mmole/mole AgX in the outer 10% by weight of said cristals and said layer contains a gelatin species containing Ca.sup.2+ in an amount ranging from 0.2% to 1% by weight.Type: GrantFiled: June 13, 1995Date of Patent: March 26, 1996Assignee: AGFA-Gevaert, N.V.Inventors: Ludo Van Rompuy, Paul Coppens
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Patent number: 5500336Abstract: A silver halide photographic material comprising a support having thereon at least one silver halide emulsion layer, where at least one silver halide emulsion layer contains a silver halide emulsion obtained by treating a silver halide emulsion containing a dye previously added thereto with a solid adsorbent which is a porous organic synthetic resin without any ion exchange group to thereby desorb the dye adsorbed.Type: GrantFiled: January 28, 1994Date of Patent: March 19, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Hiroyuki Asanuma, Fumitaka Ueda, Tadaaki Tani
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Patent number: 5498517Abstract: A process is disclosed for the preparation of a hybrid direct positive silver halide emulsion comprising the steps of (1) forming an essentially cubic host grain emulsion consisting of silver bromide or silver iodobromide, with a iodide content between 0 and 10 mole %, by a balanced double jet, (2) depositing epitaxially on the corners of said formed essentially cubic host grains a silver iodide crystallographic phase wherein said silver iodide phase contains at most 5 % of the total crystal silver halide, either by precipitating a silver chloride epitaxial phase and converting it to silver iodide, or by adding silver ions and an organic iodide releaser.The organic iodide releaser is preferably mono-iodoacetic acid.Type: GrantFiled: September 30, 1994Date of Patent: March 12, 1996Assignee: Agfa-Gevaert, N.V.Inventors: Ann Verbeeck, Kris Viaene
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Patent number: 5498518Abstract: A process is disclosed for the preparation of a chloride rich tabular grain emulsion having (100) major crystal faces, characterized in that the precipitation is performed in the presence of a phenylmercaptotetrazole compound.The scope of the invention further comprises photographic materials comprising an emulsion thus prepared.Type: GrantFiled: November 14, 1994Date of Patent: March 12, 1996Assignee: Agfa-Gevaert, N.V.Inventor: Detlef Brennecke
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Patent number: 5498511Abstract: A silver halide photographic material is disclosed, which comprises a support having thereon at least one silver halide emulsion layer, wherein the swelling amount of the hydrophilic colloid layers including the light-sensitive silver halide emulsion layer and a protective layer coated on at least one side of the support is not more than 10 .mu.m in thickness and at least 60% of the total projected area of the total silver halide grains in at least one silver halide emulsion layer includes tabular silver halide grains having a Cl.sup.- content of at least 20 mole %, a {100} plane as the major plane, a thickness of 0.35 .mu.m or less, and an aspect ratio (diameter/thickness) of at least 2, and further a developing process for developing the above silver halide photographic material with a developer containing ascorbic acid or the derivative thereof is disclosed.Type: GrantFiled: October 21, 1994Date of Patent: March 12, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Seiji Yamashita, Mitsuo Saitou, Tomoyuki Ozeki, Tatsuya Ishizaka
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Patent number: 5498516Abstract: A silver halide photographic light-sensitive material having a silver halide emulsion layer on a support, wherein said silver halide emulsion layer contains a silver halide emulsion in which silver halide tabular grains (fringe-dislocation tabular grains), which have an aspect ratio of 2 to 40 and in which dislocation lines are localized essentially to only fringe portions, occupy 100% to 80% of a total projected area of all grains.Type: GrantFiled: May 12, 1993Date of Patent: March 12, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Makoto Kikuchi, Hisashi Okamura
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Patent number: 5496694Abstract: A silver halide photographic light-sensitive material includes a support having provided thereon a silver halide emulsion layer containing a silver halide emulsion in which, when that a specific silver iodide content is I mol % (0.3<I<20), silver halide grains having a silver iodide content ranging between 0.7I and 1.3I and containing 10 or more dislocation lines per grain account for 100 to 50% of all grains, and an average aspect ratio of all tabular grains is 8 to 40.Type: GrantFiled: March 2, 1994Date of Patent: March 5, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Makoto Kikuchi, Tetsuo Okutsu
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Patent number: 5491055Abstract: The invention relates to an emulsion comprising silver halide grains said grains comprising sensitizing dyes adsorbed onto said grains during grain forming or sensitizing and at least one sulfodihydroxy aryl compound represented by the Fomulas I or II ##STR1## wherein X and Y represent an SO.sub.3 group or a hydrogen with at least one of X and Y being a sulfo group.Type: GrantFiled: December 23, 1994Date of Patent: February 13, 1996Assignee: Eastman Kodak CompanyInventor: Sang H. Kim
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Patent number: 5491056Abstract: A process is disclosed for preparing a photographic emulsion utilizing an alkynylamine compound as a grain growth modifier. Specifically, the present invention provides a process of preparing a photographic emulsion comprising:introducing silver ions, halide ions and a grain growth modifier having the structure ##STR1## wherein z represents atoms necessary to complete a five to nine-membered heterocyclic ring system, R.sup.1, R.sup.2 and R.sup.3 independently represent hydrogen or a lower alkyl of from 1 to 5 carbon atoms, and R.sup.4 represents hydrogen, or an aliphatic, carbocyclic, or heterocyclic group, which may be substituted or unsubstituted, into a dispersing medium containing silver halide seed grains; andmaintaining the dispersing medium containing the seed grains, silver ions, halide ions and grain growth modifier at a pH in the range from about 4.5 to about 10, and a pAg in the range from about 6.0 to about 9.5.Type: GrantFiled: August 26, 1994Date of Patent: February 13, 1996Assignee: Eastman Kodak CompanyInventors: Xin Wen, Roger Lok
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Patent number: 5489504Abstract: A silver halide photographic emulsion which is improved in photographic speed, fog and graininess is provided, comprising a dispersion medium and light-sensitive silver halide grains, wherein said silver halide grains are formed, in the presence of an oxidizing agent at a time during the course of forming said silver halide grains, by supplying an emulsion comprising silver halide fine grains formed in the presence of dispersion medium.Type: GrantFiled: June 14, 1993Date of Patent: February 6, 1996Assignee: Konica CorporationInventor: Hiroshi Takada
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Patent number: 5486451Abstract: A method is disclosed of preparing washed silver halide photographic emulsions wherein silver halide grain formation is effected in the presence of an acid-coagulable gelatin derivative or a mixture of gelatin and an acid-coagulable gelatin derivative and coagulation of the emulsion occurs in the presence of ionic copolymers of styrene sulfonic acid and maleic acid.Type: GrantFiled: August 4, 1994Date of Patent: January 23, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Alberto Vacca, Paolo Barletta
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Patent number: 5484697Abstract: The present invention relates to a method for preparing a photographic tabular silver halide grains emulsion. The method is characterized in that the twinned silver halide seeds are precipitated, either in an external static nucleator working in laminar flow regime with a Reynolds number less than 2100, or in a kettle with a very low stirring rate with respect to the one generally used, and in that the concentration of the Ag.sup.+ ion solution is ranging from 0.04 to 0.3M.Obtained are tabular silver halide grains, the diameter distribution of which is less than 15%.Type: GrantFiled: November 12, 1993Date of Patent: January 16, 1996Assignee: Eastman Kodak CompanyInventors: Andre G. E. Mignot, Pierre H. Jezequel
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Patent number: 5482826Abstract: There is disclosed a method for forming silver halide grains and a method for processing a silver halide photographic material using the same. The method for forming silver halide grains comprises using at least one iodide-ion-releasing compound represented by the following formula (I) or (II):I--L--So.sub.3.sup.- M.sup.+ formula (I)wherein L represents a divalent organic group and M.sup.+ represents a hydrogen ion or a monovalent cation, ##STR1## wherein L represents a divalent organic group, R.sup.1 and R.sup.2, which are the same or different, each represent a hydrogen atom, an alkyl group, an aralkyl group, or an aryl group, which groups may be substituted, and R.sup.1 and R.sup.2 may bond together to form a ring.Type: GrantFiled: February 16, 1994Date of Patent: January 9, 1996Assignee: Fuji Photo Film Co., Ltd.Inventors: Hisashi Okamura, Hiroshi Kawamoto, Makoto Kikuchi
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Patent number: 5482825Abstract: A method of making a silver halide emulsion comprising precipitating and chemically sensitizing the emulsion and further comprising adding to the emulsion a fused dihydropyrimidine compound represented by the following formula: ##STR1## wherein X is O, S or Se; R is a substituted or unsubstituted alkyl or aryl group; andZ contains the atoms necessary to form an aromatic group, a heteroaromatic group or a heterocyclic group and a silver halide emulsion made by this method.Type: GrantFiled: December 23, 1994Date of Patent: January 9, 1996Assignee: Eastman Kodak CompanyInventors: Roger Lok, Carl R. Preddy, Xin Wen
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Patent number: 5478721Abstract: A color negative or reversal photographic element comprising a support having situated thereon a non-tabular silver halide emulsion layer, said emulsion layer being predominantly silver chloride and containing a compound of the formula: ##STR1## where R represents an aliphatic, carbocyclic, or heterocyclic group; X represents oxygen, sulfur, selenium, or unsubstituted or alkyl or aryl substituted nitrogen; and Z.sup.1 and Z.sup.2 independently represent hydrogen, an acyl, aliphatic, carbocyclic, or heterocyclic group.Type: GrantFiled: January 31, 1995Date of Patent: December 26, 1995Assignee: Eastman Kodak CompanyInventor: Roger Lok
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Patent number: 5478715Abstract: A silver halide photographic material comprising a support and a silver halide emulsion layer provided thereon. The silver halide emulsion is prepared by nuclear formation, crystal growth and chemical sensitization. All or a part of the nuclear formation or the crystal growth is conducted in the presence of a hexa-coordinated cyano-complex to introduce the complex into crystal lattice of the silver halide. The density of the hexa-coordinated cyano-complex contained in surface parts of silver halide grains is in the range of 10.sup.-4 to 10.sup.-2 mol per 1 mol of silver. The surface parts of silver halide grains has a thickness of not more than 20.ANG. from the surfaces of the grains. The chemical sensitization is conducted using a gold sensitizer. The silver halide emulsion is prepared using a synthetic polymer as a protective colloid in place of gelatin. In the cases in which gelatin is used, it is present in an amount of not more than 10 g per 1 mol of silver.Type: GrantFiled: June 14, 1994Date of Patent: December 26, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Tomoyuki Ohzeki, Shinji Ikari
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Patent number: 5478716Abstract: A silver halide emulsion is provided, which comprises silver halide twinned-crystal grains and satisfy the following requirements (1) and (2):(1) the longest distance between twin planes is within the range of 10 to 100 .ANG. on the average,(2) said silver halide grains each comprise a core comprising silver iodobromide having a silver iodide content of not less than 7 mol % and a shell comprising one or more layers different in halide composition from each other, in which at least one layer of the shell comprises silver iodobromide or silver bromide, the outermost layer having a silver iodide content of 0 to 4 mol %.Type: GrantFiled: September 19, 1994Date of Patent: December 26, 1995Assignee: Konica CorporationInventors: Tadanobu Sekiya, Yasuo Honta, Syoji Matsuzaka
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Patent number: 5478717Abstract: An emulsion contains tabular silver halide having a thickness of less than 0.5 .mu.m, a diameter of 0.3 .mu.m or more, and a grain diameter/thickness ratio of 2 or more. The tabular silver halide grains account for at least 50% of a total projected area of all silver halide grains. 50% (number) or more of the tabular silver halide grains include 10 or more dislocations per grain. A relative standard elevation of silver iodide content of individual tabular silver halide 30% or less. This light-sensitive silver halide emulsion has a high sensitivity and a high gamma improved in photographic properties and in rate of development. Each tabular silver halide grain may internally have a portion where a silver iodide content is higher than that of the surface of the grain.Type: GrantFiled: January 9, 1995Date of Patent: December 26, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Hideo Ikeda, Takefumi Hara
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Patent number: 5478718Abstract: A method has been found for the preparation of tabular silver halide emulsions having a tabularity, defined as the ratio between the aspect ratio and the thickness of the emulsion crystals, of at least 25 and a homogeniety of the distribution of said silver halide emulsion crystals, defined as a hundred times the ratio between the standard deviation and the average projective crystal diameter of said crystals of less than 30, characterized by the steps of forming silver halide grain nuclei by introduction of an aqueous silver salt solution and an aqueous halide salt solution, both solutions optionally comprising at least one non-aqueous solvent, in a reaction vessel containing water, a protective colloid and at least one non-aqueous aprotic solvent or a protic solvent having a dissociation constant smaller than that of water in a ratio by weight of solvent versus water from 5 to 60%; adding an aqueous silver salt solution and an aqueous halide salt solution to the said reaction vessel containing the said silvType: GrantFiled: January 18, 1995Date of Patent: December 26, 1995Assignee: AGFA-Gevaert, N.V.Inventors: Ann Verbeeck, Angel Millan
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Patent number: 5476760Abstract: Tabular grain emulsions of enhanced photographic sensitivity are disclosed in which the tabular grains contain a maximum surface iodide concentration along their edges and a lower surface iodide concentration within their corners than elsewhere along their edges.Type: GrantFiled: October 26, 1994Date of Patent: December 19, 1995Assignee: Eastman Kodak CompanyInventors: David E. Fenton, Lucius S. Fox, Donald L. Black
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Patent number: 5476761Abstract: A method is disclosed to prepare a light-sensitive regular silver bromide or silver bromoiodide emulsion, wherein said method comprises the following the steps:precipitating silver bromide or silver bromoiodide by means of the double-jet or triple-jet technique in colloidal silica having a particle size from 0.003 .mu.m to 0.30 .mu.Type: GrantFiled: September 12, 1994Date of Patent: December 19, 1995Assignee: AGFA-Gevaert, N.V.Inventors: Ann Verbeeck, Hubert Vandenabeele
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Patent number: 5472838Abstract: Silver halide emulsions with tabular grains showing increased aspect ratio are produced by adding to the precipitiation vessel a compound of the formula I: ##STR1## in which R.sub.1 means H or optionally substituted alkyl, aralkyl or cycloalkylR.sub.2 means H or optionally substituted alkyl, aryl or aralkyl or a polymer chainR.sub.3 means H, OH, alkyl, aryl, aralkyl, halogen, NHR.sub.4, O--CO--R.sub.4, O--CO--NHR.sub.4 or an optionally substituted oxazoline ringR.sub.4 means optionally substituted or alkyl, aralkyl or arylm means 2 or 3,n means 2 to 10,000,or a compound of the formula II ##STR2## in which R.sub.1, R.sub.3, n and m have the meaning stated above and may be identical or different andR.sub.5 means optionally substituted alkene, arylene, aralkene or a polyaddition, polycondensation or polymerisation chain.Type: GrantFiled: July 11, 1994Date of Patent: December 5, 1995Assignee: Agfa-Gevaert AGInventors: Gunter Helling, Klaus Wagner
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Patent number: 5472837Abstract: A silver halide emulsion comprising 50% to 100% of projected area of all silver halide grains are occupied by hexagonal tabular silver halide grains which have an aspect ratio of 8 to 40, which have a ratio of the longest side to the shortest side of 1 to 2, and which have an average silver iodide content of 2 mol % to 10 mol %, and all silver halide grains have a grain size of variation coefficient of 8% to 20%. A method of preparing the emulsion described above, comprising a nucleation step and a grain-growing step and in which a dispersant used in the nucleation step is low-molecular gelatin having a molecular weight of 5,000 to 25,000, and nucleation time t (seconds) in the nucleation step satisfies the relationship of 1<t<-T+90, where T (.degree.C.) is a temperature of a reaction vessel at the time of the nucleation step.Type: GrantFiled: February 1, 1994Date of Patent: December 5, 1995Assignee: Fuji Photo Film Co., Ltd.Inventor: Tetsuo Okutsu
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Patent number: 5472836Abstract: A silver halide photographic emulsion containing silver halide grains comprising {111} and {100} faces and having a silver iodide content of less than 2 mol %, wherein silver halide grains having 5 or more dislocations per grain account for not less than 50% of the total number of silver halide grains, the dislocations being located substantially on the {100} face.Type: GrantFiled: March 11, 1994Date of Patent: December 5, 1995Assignee: Konica CorporationInventor: Yoshihiro Haga
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Patent number: 5468601Abstract: A process is disclosed for the precipitation of a silver halide emulsion containing host grains having {100} crystal faces that are sensitized by the deposition of protrusions at the intersections of the {100} crystal faces. Protrusion growth is achieved by undertaking final silver introduction in the presence of a benzothiazolium site director containing a 5-position electron withdrawing ring substituent adsorbed to the {100} crystal faces of the grains being grown.Type: GrantFiled: April 12, 1994Date of Patent: November 21, 1995Assignee: Eastman Kodak CompanyInventor: Xin Wen
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Patent number: 5468602Abstract: A method for producing silver halide photographic light-sensitive material is disclosed. The method comprises the steps of (1) forming silver halide crystal nuclei, (2) growing the nuclei to form a silver halide emulsion, (3) chemically sensitizing the silver halide emulsion with a selenium compound, and (4) coating and drying the silver halide emulsion on a support, and a compound represented by formula I is added to the silver halide emulsion during the time between the moment of completion of the nuclei forming step and the moment of completion of the chemically sensitizing step. ##STR1## In the formula R.sub.1 is a hydrogen atom, a straight or branched alkyl group, a cycloalkyl group, an alkenyl group, an aralkyl group, an alkoxyl group, an aryl group, a heterocyclic group, a carbamoyl group, a thiocarbamoyl group or a sulfamoyl group; R.sub.2 and R.sub.Type: GrantFiled: November 2, 1994Date of Patent: November 21, 1995Assignee: Konica CorporationInventor: Shigeaki Takahashi
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Patent number: 5466570Abstract: The present invention is a method for producing a silver halide emulsion. The precipitation of the emulsion is carried out away from the rotary agitator. The reactant solutions are introduced into the reactor very close to the tip of one or more ultrasonic horns that are placed away from the agitator. The ultrasonic horns are efficient sources for controlling micromixing, while the agitator controls the macromixing in the reactor.Type: GrantFiled: February 21, 1995Date of Patent: November 14, 1995Assignee: Eastman Kodak CompanyInventors: Seshadri Jagannathan, David F. Mahar, Rajendrakumar V. Mehta
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Patent number: 5464727Abstract: The present invention is a method for cleaning and preparing photographic manufacturing equipment surfaces. An aqueous solution of potassium iodide and ferric ethylenediamine tetraacetate is prepared. The solution is flushed over the surfaces of the photographic manufacturing equipment removing deposited silver halide and silver. A high purity water flush is then performed.Type: GrantFiled: February 8, 1995Date of Patent: November 7, 1995Assignee: Eastman Kodak CompanyInventor: Douglas E. Singer
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Patent number: 5462850Abstract: There is provided a silver halide photographic material which comprises silver chloride or silver chlorobromide substantially free from silver iodide. The silver halide photographic material is excellent in rapid processability, low in fogging, and high in sensitivity and contrast.Type: GrantFiled: February 6, 1995Date of Patent: October 31, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Masahiro Asami, Naoto Ohshima, Shigeaki Otani
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Patent number: 5460936Abstract: A silver halide photographic emulsion is disclosed, wherein the silver halide emulsion contains silver halide grains having an average iodide content of not less than 4 mol %, the grains comprising an internal silver halide phase having an average iodide content of 10 mol % to a solid solution limit and a surface silver halide phase having an average iodide content of not more than 4.5 mol %.Type: GrantFiled: September 22, 1994Date of Patent: October 24, 1995Assignee: Konica CorporationInventors: Toshiya Kondo, Sadayasu Ishikawa
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Patent number: 5460935Abstract: A silver halide photographic material is disclosed which is processed by an automatic processor having a drying zone where drying is conducted by a heat transfer medium of 75.degree. C. or higher, wherein the photographic material has at least one silver halide emulsion layer, and at least one silver halide emulsion having a tabular degree of at least 25 is contained in at least one layer of the silver halide emulsion layers.Type: GrantFiled: February 22, 1994Date of Patent: October 24, 1995Assignee: Fuji Photo Film Co., Ltd.Inventor: Ichizo Toya
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Patent number: 5460937Abstract: Hydrophobic compounds, such as photographically useful compounds, are incorporated into an aqueous medium, such as a silver halide emulsion or a photographic coating composition, by forming a solid additive material comprising the hydrophobic compound and a solid hydrophilic material. The solid hydrophilic material is preferably a mixture of a polysaccharide and sorbitol or succinimide. The additive material is prepared by dry powder mixing the solid hydrophobic compound and solid hydrophilic material followed by a process step that heats, expells, and cools the composition to produce a high surface area uniform material having a specific surface area of at least about 10 square centimeters per gram. The additive material can then be dissolved directly and uniformly in the aqueous medium.Type: GrantFiled: September 7, 1994Date of Patent: October 24, 1995Assignee: Eastman Kodak CompanyInventors: James W. Blease, John W. Boettcher
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Patent number: 5449599Abstract: A silver halide light-sensitive photographic material for applications in the field of mammography is disclosed which has an improved diagnostic value by an enhanced sharpness. The silver halide crystals to be used in the said material show a fog level, a toe contrast and an overall contrast that is, like the image quality, substantially uneffected by the processing conditions. The coating amount of silver halide crystals in the emulsion layer can be reduced to such an amount that an archivability of from 10 to 20 years can be assured in normal storage conditions. The X-ray material is suitable for rapid processing, without loss in sensitivity, within processing cycles of 45 or 38 seconds, wherein hardener-free processing solutions can be used.Type: GrantFiled: January 21, 1994Date of Patent: September 12, 1995Assignee: Agfa-Gevaert, N.V.Inventor: Luc J. Heremans
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Patent number: 5447834Abstract: A color photographic material for diffusion transfer which comprises a support having thereon at least one light-sensitive silver halide emulsion layer containing a combination of a reducible dye providing compound represented by the following general formula (I) and an electron donor, said reducible dye providing compound releasing a diffusing dye when reduced, wherein at least one layer of silver halide emulsion layers contains a silver halide emulsion obtained by treating a silver halide emulsion, previously chemical sensitized in the presence of a sensitizing dye, with a solid adsorbent to desorb a part or the whole of the adsorbed dye.PWR-(Time).sub.t -Dye (I)wherein PWR represents a group which releases -(Time).sub.t -Dye when reduced; Time represents a group which releases Dye through subsequent reactions after -(Time).sub.t -Dye is released from PWR; t represents an integer of 0 or 1; and Dye represents a dye or a precursor thereof.Type: GrantFiled: April 4, 1994Date of Patent: September 5, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Munehisa Fujita, Hiroyuki Asanuma
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Patent number: 5448160Abstract: The present invention concerns a method and apparatus for determining average particle size of silver halide grains in a solution or emulsion containing silver ions and excess halide ions. The potential of the silver ion in solution (E.sub.d) is measured using a silver electrode and the potential of the silver ion in solution with infinitely large silver halide particles (E.sub.e) is measured using a silver electrode coated with silver halide. The molecular volume (v) of the solute is calculated and the average particle size (d) is calculated from the following formula: ##EQU1## wherein F is the Faraday constant and (s) is the surface energy of the average particle size per unit area.Type: GrantFiled: January 14, 1994Date of Patent: September 5, 1995Assignee: Eastman Kodak CompanyInventor: Lu Chow
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Patent number: 5447826Abstract: A photographic light-sensitive silver halide material is disclosed comprising a support and one or more hydrophylic colloid layers including at least one light-sensitive silver halide emulsion layer characterized in that in said emulsion layer is a gold and sulphur sensitized silver bromide or silver bromoiodide emulsion having cubic crystal habit and in that said emulsion and/or a hydrophylic colloid layer in water-permeable relationship therewith comprises a 3-pyrazolidinone compound.Type: GrantFiled: April 18, 1994Date of Patent: September 5, 1995Assignee: AGFA-Gevaert, N.V.Inventors: Luc J. Heremans, Rudi A. Goedeweeck
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Patent number: 5443946Abstract: There is disclosed a silver halide photographic material and a method for forming a color image, which uses an emulsion that is suitable for scanning exposure by laser diodes, that is excellent in rapid processability, and that is high in sensitivity and contrast. And, there is provided a silver halide photographic material and a method for forming a color image, that uses an emulsion that is small in the fluctuation in gradation and sensitivity owing to a change in exposure illumination intensity and that is particularly small in the fluctuation in sensitivity owing to a change in temperature at the time of exposure in high-intensity exposure, such as laser scanning exposure.Type: GrantFiled: November 15, 1993Date of Patent: August 22, 1995Assignee: Fuji Photo Film Co., Ltd.Inventor: Masahiro Asami
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Patent number: 5443947Abstract: A compound represented by Formula IMO.sub.2 S--Z--SO.sub.2 SM.sup.1 (I)wherein Z is a non-metallic arylene, alkylene or heterocyclic group, and M and M.sup.1 are independently cationic counter ions and the use of said compound in a silver halide photographic element comprising a silver halide emulsion which is greater than 50 mole % silver chloride.Type: GrantFiled: November 30, 1993Date of Patent: August 22, 1995Assignee: Eastman Kodak CompanyInventor: Roger Lok
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Patent number: 5441864Abstract: A silver halide light-sensitive photographic material comprising a support having on at least one side thereof a silver halide emulsion layer comprising a silver halide emulsion, wherein the silver halide emulsion is prepared by chemically-ripening the silver halide emulsion containing silver halide grains and a hydrophilic colloid in amounts of at least 7% by volume and at least 5% or more by weight, respectively, and preferably in the presence of iodide containing silver halide fine grains.Type: GrantFiled: March 1, 1994Date of Patent: August 15, 1995Assignee: Konica CorporationInventor: Yorihiro Yamaya
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Patent number: 5441865Abstract: This invention describes the use of gelatin-grafted-polymer particles as peptizers for the preparation of silver halide photographic emulsions, whereby the gelatin-grafted-polymer particles remain attached to the AgX crystals after preparation of the emulsions. In an embodiment of this invention, the core polymer particles are loaded with photographically useful agents. When the photographic agent is a dye-forming coupler, multicolor mixed-packet systems can be constructed using the packet emulsions prepared in the manner of this invention.Type: GrantFiled: January 7, 1993Date of Patent: August 15, 1995Assignee: Eastman Kodak CompanyInventors: John D. Lewis, Mark A. Whitson, Thomas J. Dannhauser, Tienteh Chen, Pranab Bagchi
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Patent number: 5439788Abstract: In a method of manufacturing a light-sensitive silver halide emulsion with an average grain size of 0.04 to 0.2 .mu.m, a sensitizing dye is added at a temperature of 25.degree. C. to 50.degree. C., and subsequently chemical ripening is performed at a temperature higher than the addition temperature of the sensitizing dye.Type: GrantFiled: April 28, 1994Date of Patent: August 8, 1995Assignee: Fuji Photo Film Co., Ltd.Inventor: Hiroshi Takehara
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Patent number: 5439787Abstract: A silver halide photographic emulsion prepared in the presence of at least one member of polymers comprising at least one repeating unit derived from at least one member of monomers represented by the following formula (1) ##STR1## wherein R.sup.1 represents a hydrogen atom or a lower alkyl group; R.sup.2 represents a monovalent substituent group; R.sup.3 represents an alkylene group having 3 to 10 carbon atoms; L represents a bivalent bonding group; and n represents the mean number of a repeating unit represented by --R.sup.3 --O-- and is a number of at least 4, but not more than 200.Type: GrantFiled: July 7, 1994Date of Patent: August 8, 1995Assignee: Fuji Photo Film Co. Ltd.Inventors: Junichi Yamanouchi, Yoichi Hosoya, Shigeharu Urabe
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Patent number: 5437971Abstract: A process for preparing a monodispersed silver halide grain emulsion characterized in that said process comprises the steps of:(a) forming silver halide nuclei with single jet precipitation by adding a watersoluble silver salt solution to a reaction vessel containing a water-soluble halide salt solution in a hydrophilic colloid at a pCl of from 1.0 to 2.0 and at a temperature lower than 80.degree. C., said water-soluble silver salt solution being added in an amount of from 0.1 to 15% by weight of silver relative to the total silver,(b) stabilizing said silver halide nuclei to seed crystals for at least six minutes at a temperature lower than 80.degree. C. and at pCl of from 1.5 to 3.0 by Ostwald ripening, and(c) growing said seed crystals by double jet precipitation of silver and halide salt solutions at a constant chloride ions excess of from 30 to 70% mol and a temperature lower than 80.degree. C.Type: GrantFiled: June 10, 1994Date of Patent: August 1, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Marco Loiacono, Giuseppe Loviglio
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Patent number: 5436111Abstract: A color diffusion transfer light-sensitive material is described including a support having thereon at least one light-sensitive emulsion layer associated with a dye image-forming material and an electron donor, wherein the dye image-forming material comprises at least one reducible dye-providing compound represented by formula (I) which releases a diffusible dye upon being reduced and tabular silver halide grains having a mean grain diameter of at least about 0.3 .mu.m, a mean grain thickness of less than about 0.5 .mu.m, and a mean aspect ratio of at least about 2 account for at least about 50% of the total projected area of the silver halide grains contained in at least one light-sensitive emulsion layer;PWR - (Time).sub.t - Dye (I)wherein PWR represents a group capable of releasing -(Time).sub.t -Dye upon being reduced; Time represents a group capable of releasing Dye through a subsequent reaction after being released as -(Time).sub.Type: GrantFiled: September 16, 1993Date of Patent: July 25, 1995Assignee: Fuji Photo Film Co., Ltd.Inventors: Munehisa Fujita, Shigeharu Urabe
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Patent number: 5434043Abstract: A negative-acting photothermographic element comprising a support bearing at least one heat-developable, photosensitive, image-forming photothermographic emulsion layer comprising:(a) an iridium doped, preferably iridium-doped core-shell, photosensitive silver halide grains, generally containing a total silver iodide content of less than 10 mole %, the shell having a second silver iodide content lower than the silver iodide content of the core;(b) a non-photosensitive, reducible source of silver;(c) a reducing agent for the non-photosensitive, reducible source of silver;(d) a binder; and(e) optionally at least one compound selected from the group consisting of: a halogen molecule; an organic haloamide; and hydrobromic acid salts of nitrogen-containing heterocyclic compounds which are further associated with a pair of bromine atoms.A process of forming photothermographic emulsions from iridium-doped silver halide grains by forming silver soaps in the presence of those grains is also described.Type: GrantFiled: May 9, 1994Date of Patent: July 18, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Chaofeng Zou, James B. Philip, Steven M. Shor, Mark C. Skinner, Pu Zhou
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Patent number: RE35003Abstract: A silver halide photographic light-sensitive material includes a support and at least one layer of silver halide emulsion formed on the support. The emulsion layer contains silver halide grains which have been subjected both to reduction sensitization while growing and to at least one chemical sensitization selected from the group consisting of gold sensitization, sulfur sensitization, and noble-metal sensitization. Each of the silver halide grains has at least 5 mol % of silver iodide on a surface thereof.Type: GrantFiled: August 12, 1992Date of Patent: July 25, 1995Assignee: Fuji Photo Film Co., Ltd.Inventor: Shunji Takada
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Patent number: H1516Abstract: A silver halide photographic material comprising a support having provided thereon one or more hydrophilic colloid layers, at least one layer of which is a silver halide emulsion layer comprising a silver halide emulsion containing silver halide grains, wherein the silver halide grains contained in the at least one silver halide emulsion layer have a silver iodide content of not more than 0.5 mol %, the melting time of the silver halide photographic material is at least 30 minutes, and the total thickness of constituent hydrophilic colloid layers per each side of the support having thereon the at least one silver halide emulsion layer is less than 3.8 .mu.m.Type: GrantFiled: October 12, 1994Date of Patent: January 2, 1996Assignee: Fuji Photo Film Co., Ltd.Inventor: Tatsuya Ishizaka