And Inorganic Silver Compound Patents (Class 430/619)
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Patent number: 4430415Abstract: A heat-developable color photographic material is disclosed. The material is comprised of a support having thereon a layer containing fine droplets of complex coacervate containing a light-sensitive silver halide, an organic silver salt oxidizing agent and a color image forming substance which are prepared by complex coacervation and hardened with a hardening agent. Color fog does not occur with the material and it can be easily prepared to provide a color image having good color balance by imagewise exposure to light and a heat development procedure. A process for forming a color image using the heat-developable color photographic material is also disclosed.Type: GrantFiled: September 2, 1982Date of Patent: February 7, 1984Assignee: Fuji Photo Film Co., Ltd.Inventors: Toshiaki Aono, Hiroshi Hara, Hideki Naito, Kozo Sato
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Patent number: 4430420Abstract: In a photothermographic silver halide material and process for preparing an enhanced silver image, an aminosulfonylhydrazone that is capable of developing an image in the photothermographic material and that is capable, upon oxidation, of releasing an aminosulfinic acid, which, in turn, thermally releases ammonia or amine provides a silver image in the photothermographic material and provides ammonia or amine for activation of an ammonia or amine responsive imaging material. After imagewise exposure of the photothermographic material, a silver image enhanced by an image in the ammonia or amine responsive imaging material is produced by heating the photothermographic material.Type: GrantFiled: August 27, 1982Date of Patent: February 7, 1984Assignee: Eastman Kodak CompanyInventor: Anthony Adin
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Patent number: 4426441Abstract: In a dye-forming imaging material comprising (a) a dye-forming coupler, and (b) an organic reducing agent that is capable in its oxidized form of reacting with the dye-forming coupler to form a dye, improvements are provided by a reducing agent that is a ureidoaniline silver halide developing agent free of strong electron withdrawing groups. Such an imaging material can be a photographic silver halide material. The imaging material can be a photothermographic material for producing a dye image comprising, in reactive association, (a) photographic silver halide, (b) a dye-forming coupler, and (c) an oxidation-reduction image forming combination comprising (1) an organic silver salt oxidizing agent, and (2) an organic reducing agent for the organic silver salt oxidizing agent, wherein the reducing agent is a ureidoaniline which is capable in its oxidized form of reacting with the dye-forming coupler to form a dye.Type: GrantFiled: December 3, 1982Date of Patent: January 17, 1984Assignee: Eastman Kodak CompanyInventors: Anthony Adin, Roy C. DeSelms
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Patent number: 4411985Abstract: Stabilizer precursors which comprise triarylphosphines and triarylphosphoranes and which, upon being heated to a temperature above about 100.degree. C., release a phosphorous compound silver halide stabilizer that is useful in a heat stabilizable photographic silver halide material comprising photographic silver halide. A stabilized image is produced in the photographic material following exposure and development by heating the material to processing temperature. The triarylphosphines and triarylphosphoranes are useful in a dry physical development photographic material and process. Alternatively, the triarylphosphines and triarylphosphoranes are useful in a dry chemical photographic material and process.Type: GrantFiled: September 17, 1981Date of Patent: October 25, 1983Assignee: Eastman Kodak CompanyInventors: Lawrence R. Morrow, John Thatcher
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Patent number: 4411984Abstract: A diphenylamine compound that is a precursor for a phenazine dye comprises, in an ortho position to the amine of the diphenylamine, a sulfonyldiamido group (--NHSO.sub.2 NHR) that is capable of releasing a sulfonylamine fragment upon oxidation. The diphenylamine compound upon oxidation intramolecularly cyclizes to a phenazine dye. The sulfonylamine fragment is capable of thermally releasing ammonia or an amine. The diphenylamine compound and sulfonylamine fragment are useful in imaging such as in photothermography. Ammonia or an amine thermally released from the sulfonylamine fragment enables imaging in imaging materials that are responsive to ammonia or an amine. The diphenylamine compound also generally is a silver halide developing agent.Type: GrantFiled: May 3, 1982Date of Patent: October 25, 1983Assignee: Eastman Kodak CompanyInventor: Rolf S. Gabrielsen
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Patent number: 4409316Abstract: Photothermographic imaging elements are provided with strippable layers which have electrical conductivity in the range of 60 to 1,500 ohms/square. The elements may be exposed to radiation and then thermally developed by applying a voltage across the strippable layer which becomes resistively heated. After development, the strippable layer may be removed.Type: GrantFiled: February 26, 1982Date of Patent: October 11, 1983Assignee: Minnesota Mining and Manufacturing CompanyInventors: Jeanine I. Zeller-Pendrey, Mark C. Skinner, David A. Morgan
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Patent number: 4404390Abstract: Mesoionic 1,2,4-triazolium-3-thiolate silver halide stabilizer precursors are novel compounds useful in a heat developable and heat stabilizable photographic silver halide materials and processes. After imagewise exposure of the photographic material, a developed and stabilized silver image is produced by heating the element. Mesoionic stabilizer precursors are also useful in photographic silver halide processing compositions.Type: GrantFiled: November 9, 1981Date of Patent: September 13, 1983Assignee: Eastman Kodak CompanyInventors: Henry W. Altland, Daniel D. Shiao
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Patent number: 4396712Abstract: A novel dry image forming material comprising in one or more layers on a support (a) a non-photosensitive organic silver salt oxidizing agent, (b) a reducing agent for silver ions, (c) a silver halide component or a silver halide-forming component, (d) a toning agent and (e) a lipophilic binder, characterized by the inclusion of a specific 2-(2'-hydroxyphenyl)benzotriazole compound having bulky tert-butyl or tert-amyl groups at its ortho- and para-positions relative to the hydroxyl group in a layer containing the component (a). The dry image forming material of the present invention has high storage stability prior to use for image formation.Type: GrantFiled: May 29, 1981Date of Patent: August 2, 1983Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Shozo Kinoshita, Muneaki Kimura, Tetsuo Shiga
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Patent number: 4395484Abstract: A UV sensitive dry silver photothermographic construction for graphic arts use can be freely handled for one to two minutes under cool white fluorescent lighting or incandescent lighting. The construction comprises in sequence:a. a substrate,b. a continuous layer of a dry silver dispersion coating containing an organic silver full soap/half soap blend, a reducing agent, halide ion, and a binder resin, andc. a continuous protective topcoat layer comprising a cellulose acetate resin admixed with an effective amount of a development accelerator,said construction further comprising (1) halide ion in said silver dispersion coating or in said topcoat layer, said halide ion being at least 96 mole percent chloride ion, said halide ion when present in said dispersion coating being admixed in said dispersion subsequent to the admixing of at least a portion of said binder resin with said organic silver soap blend, and (2) an antihalation agent in any of the aforementioned layers or in a separate layer.Type: GrantFiled: June 25, 1982Date of Patent: July 26, 1983Assignee: Minnesota Mining and Manufacturing CompanyInventor: Greg J. McCarney
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Patent number: 4374921Abstract: A photothermographic emulsion can be provided with enhanced image density by using an indoaniline leuco dye, aromatic carboxylic acid, and p-alkylphenyl sulfonic acid in reactive association with the emulsion.Type: GrantFiled: June 8, 1981Date of Patent: February 22, 1983Assignee: Minnesota Mining and Manufacturing CompanyInventor: Robert A. Frenchik
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Patent number: 4359524Abstract: A heat-developable photosensitive material is described comprising a heat-developable photosensitive layer containing at least an organic silver salt, a photocatalyst, and a reducing agent, wherein the improvement is an antihalation layer comprising a light bleachable colored composition composed of at least (1) a photosensitive halogen-containing compound, and (2) a merocyanine dye, provided on the opposite side of said heat-developable photosensitive layer with respect to the side intended for imagewise exposure.Type: GrantFiled: July 15, 1981Date of Patent: November 16, 1982Assignee: Fuji Photo Film Co., Ltd.Inventors: Takao Masuda, Itsuo Fujiwara, Yoshimasa Aotani, Isamu Itoh
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Patent number: 4352872Abstract: Photothermographic emulsions may be stabilized against latent image fade and/or may have their speed increased by the addition of diazepines and fused aromatic diazepines.Type: GrantFiled: February 27, 1981Date of Patent: October 5, 1982Assignee: Minnesota Mining and Manufacturing CompanyInventor: Jack E. Reece
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Patent number: 4347310Abstract: A heat developable silver image forming material comprising:(a) an organic silver salt oxidizing agent;(b) a compound or a composition capable of forming a photosensitive silver compound by reaction with the organic silver salt oxidizing agent (a);(c) a reducing agent for silver ion; and(d) a compound having a unit of ##STR1##Type: GrantFiled: April 29, 1981Date of Patent: August 31, 1982Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Tetsuo Shiga, Masaru Ozaki, Tatsumi Arakawa, Takeo Kimura, Hidehiko Kobayashi
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Patent number: 4343880Abstract: A dye-forming electrically activatable recording element comprises an electrically conductive support having thereon (a) an electrically activatable recording layer comprising in an electrically conductive polymeric binder, an organic silver salt and a reducing agent, (b) a photoconductive layer separated from (a) by an air gap of up to 20 microns, and (c) an electrically conductive layer on (b), wherein the recording layer (a) comprises in reactive association, (A) a dye-forming coupler, and (B) an oxidation-reduction combination comprising (i) an organic silver salt oxidizing agent, with (ii) a reducing agent which in its oxidized form forms a dye with the dye-forming coupler. The recording element can be room light handleable and can provide a dye image and silver image by dry development processing.Type: GrantFiled: June 20, 1980Date of Patent: August 10, 1982Assignee: Eastman Kodak CompanyInventor: Mark Lelental
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Patent number: 4332889Abstract: A novel heat-activatable and heat-developable dry image forming material comprising (a) a silver salt of long chain fatty acid with at least 16 carbon atoms, (b) a reducing agent for silver ions, (c) a silver halide component including silver iodide or a silver halide-forming component including silver iodide-forming compound, (d) an oxidizing agent for free silver, (e) a photoreactive halogeno oxidizing agent, (f) a binder, and (g) a specific spectral sensitizing dye has been found to have improved spectral sensitivity as well as excellent storage stability.Type: GrantFiled: May 19, 1981Date of Patent: June 1, 1982Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Tetsuo Siga, Shozo Kinoshita, Yoshinobu Ito, Minoru Akiyama
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Patent number: 4327176Abstract: A dry image forming material comprising (a) an organic silver salt oxidizing agent, (b) a reducing agent, (c) a photosensitive silver compound or a photosensitive silver compound-forming component and (d) a high impact acrylic resin used as a binder material of the image forming coating and/or a material of any protective layer has been found to be excellent in impact peel strength, blooming or chalking resistance and storage stability of raw material. The high impact acrylic resin (d) has an Izod impact strength of at least 0.4 ft.lb/in as measured in accordance with ASTM D 256.Type: GrantFiled: November 3, 1980Date of Patent: April 27, 1982Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Ryo Matsui, Tadao Matsushika, Yoshio Hayashi, Tetsuo Shiga
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Patent number: 4307187Abstract: A thermally developable light-sensitive material comprising a support having provided therein or thereon at least one layer containing at least (a) an organic silver salt, (b) light-sensitive silver halide or a component capable of forming a light-sensitive silver halide, and (c) a reducing agent, the support further having provided therein or thereon at least one layer containing (d) at least one thiosulfonic acid. In a highly preferred embodiment, (e) one or more benzotriazoles are also present.Type: GrantFiled: May 6, 1980Date of Patent: December 22, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinpei Ikenoue, Takao Masuda
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Patent number: 4291120Abstract: A heat developable photosensitive material having two or more layers superimposed on a support and containing at least (a) an organic silver salt, (b) a photocatalyst and (c) a reducing agent in one or more such layers, at least one said layers containing (d) a polymer having a repeating unit of the formula: ##STR1## wherein R is a hydrogen atom or a lower alkyl group; and X is a hydrogen atom, or one to three groups selected from the group consisting of a halogen atom, a nitro group, a cyano group, an alkyl group, an alkoxy group, an alkoxycarbonyl group, an alkylsulfonyl group, an aryloxy group, an acyl group, an acyloxy group and an acylamido group.Type: GrantFiled: February 15, 1980Date of Patent: September 22, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Tomoyuki Kobayashi, Toshimasa Usami, Hiroshi Misu, Hidefumi Sera
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Patent number: 4288536Abstract: The addition of certain classes of aromatic nitrogen containing compounds to photothermographic emulsions stabilizes the background density of the imaged film and/or increases the speed of the emulsion.Type: GrantFiled: June 5, 1979Date of Patent: September 8, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventors: Edward J. Goettert, Gustav Gutman
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Patent number: 4283487Abstract: Images produced in photothermographic emulsions using silver halide as a light-sensitive material therein suffer from light scattering effects on the silver halide.Acutance dyes, many of which are novel, are disclosed which can absorb scattered light and which are bleached at the development temperature of the photothermographic composition.Type: GrantFiled: November 29, 1979Date of Patent: August 11, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventors: Bernard A. Lea, Ronald W. Burrows
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Patent number: 4273723Abstract: A process for preparing a silver salt of an organic carboxylic acid comprising reacting an alkali metal salt of the organic carboxylic acid with a water-soluble silver salt, and wherein there is used as the reaction solvent a mixture consisting of at least one water-soluble or partially water-soluble C.sub.3 -C.sub.8 alcohol and water and having a mixing volume ratio of 1/5 to 5/1. The silver salt of the organic carboxylic acid prepared in high yield according to the process of the present invention is in uniformly finely divided form of high purity and suitable for use in photographic materials.Type: GrantFiled: September 5, 1979Date of Patent: June 16, 1981Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Yoshio Hayashi, Takeki Matsui, Tetsuo Shiga, Kageyasu Akashi, Minoru Akiyama, Takeo Kimura
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Patent number: 4271263Abstract: Acutance agents for use in thermally developable photosensitive compositions are disclosed. These novel compositions absorb scattered light and are rendered colorless at the development temperature of the photothermographic composition.Type: GrantFiled: May 15, 1980Date of Patent: June 2, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventor: Edward J. Goettert
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Patent number: 4268626Abstract: A novel dry image forming material comprising (a) a non-photosensitive organic silver salt oxidizing agent, (b) a reducing agent for silver ions, (c) a photosensitive silver halide or a photosensitive silver halide-forming component capable of forming a photosensitive silver halide by the reaction thereof with said organic silver salt oxidizing agent, and (d) a substituted 3-pyrazolin-5-one. The dry image forming material has improved sensitivity and storage stability of the raw image forming material and can form thereon an excellent black tone image.Type: GrantFiled: August 15, 1979Date of Patent: May 19, 1981Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Minoru Akiyama, Kageyasu Akashi, Tetsuo Shiga, Yoshinobu Ito, Takeo Kimura, Takeki Matsui
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Patent number: 4267267Abstract: A thermally developable light-sensitive element comprising a support having in one or more layers thereon at least (a0) an organic silver salt, (b) light-sensitive silver halide grains and (c) a reducing agent, wherein the average grain size of the light-sensitive silver halide grains is not less than about 0.05 .mu. and the support is gas permeable and, in addition, carries thereon a subbing layer composed of at least one copolymer selected from the group consisting of a vinyl chloride type copolymer in which vinyl chloride is present in the copolymer in an amount of about 50 molar % or higher and a vinylidene chloride type copolymer in which vinylidine chloride is present in the copolymer in an amount of about 50 molar % or higher. The thermally-developable light-sensitive element of the invention is highly sensitive and in addition, has a good storage stability retaining on storage the properties possessed by the "fresh" photosensitive element even under high humidity and/or high temperature conditions.Type: GrantFiled: October 2, 1979Date of Patent: May 12, 1981Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinpei Ikenoue, Takao Masuda
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Patent number: 4264725Abstract: In a photothermographic silver halide composition capable of being coated on a support comprising a hydrophilic photosensitive silver halide emulsion containing a gelatino peptizer with an organic solvent mixture, a hydrophobic binder and an oxidation-reduction image-forming composition comprising (i) a silver salt of a long-chain fatty acid with (ii) an organic reducing agent, improvements are provided by a solvent mixture comprising a combination of (A) an alcohol photographic speed-increasing solvent which is a compound selected from the group consisting of benzyl alcohol photographic speed-increasing solvents and 2-phenoxyethanol speed-increasing solvents with (B) an aromatic hydrocarbon solvent that is compatible with the alcohol solvent and (C) 0 to 10% by weight of the solvent mixture of such hydrophobic binder.Type: GrantFiled: October 1, 1979Date of Patent: April 28, 1981Assignee: Eastman Kodak CompanyInventor: John W. Reeves
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Patent number: 4260677Abstract: Thermographic and photothermographic materials are provided by using organic or inorganic silver salts complexed with coordinating compounds having a gross stability constant between 4.50 and 10.00. When the complexed silver salt is in catalytic proximity to photosensitive silver halides, photothermographic elements are produced.Type: GrantFiled: March 12, 1976Date of Patent: April 7, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventors: John M. Winslow, Donald H. Klosterboer
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Patent number: 4260674Abstract: A photographic material for the production of an image in a dry process by forming a vesicle image upon the decomposition of a peroxide compound at image nuclei of silver by providing a layer containing a silver salt which forms upon exposure to light, in imagewise distribution, image nuclei. The silver salt has a grain size of less than 0.3 .mu.m and is present in the layer in an amount of from 1-500 mg/m.sup.2.Type: GrantFiled: December 14, 1979Date of Patent: April 7, 1981Assignee: Agfa-Gevaert AktiengesellschaftInventors: Edith Weyde, Anita von Konig, Werner Liebe
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Patent number: 4260676Abstract: A particular class of novel nitro-substituted dyes has been found to act as effective, heat labile acutance dyes for photothermographic emulsions.Type: GrantFiled: November 29, 1978Date of Patent: April 7, 1981Assignee: Minnesota Mining and Manufacturing CompanyInventor: Harvey A. Brown
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Patent number: 4259424Abstract: An improved heat-developable photosensitive material is disclosed which comprises an infrared rays-absorbing layer provided in contact with or adjacent to a layer comprising a reducible organic silver salt.Type: GrantFiled: February 5, 1979Date of Patent: March 31, 1981Assignee: Canon Kabushiki KaishaInventors: Ichiro Endo, Hajime Kobayashi, Toshiyuki Komatsu, Shigeru Ohno
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Patent number: 4237215Abstract: A heat-developable light-sensitive material comprising on a support at least one layer containing (a) an organic silver salt; (b) a light-sensitive silver halide; (c) a reducing agent; and (d) a binder; wherein the light-sensitive silver halide component (b) comprises the reaction product obtained by decomposing an N-halo compound in the presence of the organic silver salt (a) for reaction with the organic silver salt (a) before applying the layer on the support and an embodiment includes a heat-developable light-sensitive material in which the N-halo compound is decomposed in the presence of an alcohol to form the light-sensitive silver halide component (b).Type: GrantFiled: April 20, 1978Date of Patent: December 2, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinpei Ikenoue, Takao Masuda
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Patent number: 4235957Abstract: In a dry physical development photothermographic element for a dry thermal silver-dye bleach process wherein the element comprises a silver halide complexing concentration of a silver halide complexing agent improvements are provided when the complexing agent is an organic ammonium chloride, bromide or iodide. After imagewise exposure of the element, a dye image can be produced by uniformly heating the element. Improvements are also produced by providing a dry activator element for producing a dye image in a separate photographic element by means of a dry physical development thermal dye-bleach process, wherein the activator element comprises a support having thereon a layer comprising a synthetic hydrophobic polymeric binder, a silver halide complexing concentration of a silver halide complexing agent, as described, a bleachable dye and a thermal solvent.Type: GrantFiled: January 25, 1979Date of Patent: November 25, 1980Assignee: Eastman Kodak CompanyInventors: Carl F. Kohrt, Roland G. Willis
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Patent number: 4234670Abstract: A method for producing visible images in certain charge sensitive, dry processable recording elements. Image recording is accomplished by flowing, in a resistive recording element containing a reducible metal compound, an imagewise pattern of electrical current of sufficient magnitude to produce therein a storable latent image. The metal compound in the latent image areas is subsequently reduced by a dry development technique to produce a visible image.Type: GrantFiled: September 27, 1979Date of Patent: November 18, 1980Assignee: Eastman Kodak CompanyInventors: Joseph Y. Kaukeinen, Duane A. Rockafellow
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Patent number: 4234679Abstract: A dry image forming material comprising:(a) an organic silver salt oxidizing agent;(b) a photosensitive silver compound or a component capable of forming a photosensitive silver compound by the reaction with the organic silver salt oxidizing agent (a);(c) a reducing agent for silver ion; and(d) at least one compound selected from the group consisting of .alpha.,.alpha.,.alpha.',.alpha.'-o-tetrabromoxylene, .alpha.,.alpha.,.alpha.',.alpha.'-m-tetrabromoxylene, .alpha.,.alpha.,.alpha.',.alpha.'-p-tetrabromoxylene, 1,2-diiodoethane and tribromoacetic acid.Type: GrantFiled: October 12, 1978Date of Patent: November 18, 1980Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Kageyasu Akashi, Yoshio Hayashi, Tatsumi Arakawa, Takeo Kimura, Hidehiko Kobayashi
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Patent number: 4220709Abstract: A heat developable photographic material comprising in reactive association (a) photosensitive silver halide, (b) an image-forming combination comprising (i) a complex of silver with a nitrogen acid selected from the group consisting of imidazole, pyrazole, urazole, 1,2,4-triazole and 1H-tetrazole nitrogen acids or combinations thereof, with (ii) an organic reducing agent, and (c) a polymeric binder, provide developed images without the need for processing solutions or baths. An image can be developed in this heat developable material by merely heating the material to moderately elevated temperatures. Other addenda employed in heat developable materials can be employed with the heat developable photographic materials described.Type: GrantFiled: December 8, 1977Date of Patent: September 2, 1980Assignee: Eastman Kodak CompanyInventor: Richard A. deMauriac
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Patent number: 4213784Abstract: In a process for producing thermally developable light-sensitive composition which comprises heating a composition containing (a) an organic silver salt and (b) a light-sensitive silver halide, the improvement wherein the heating is conducted in the presence of (c) a sulfur-containing compound.Type: GrantFiled: July 3, 1978Date of Patent: July 22, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Shinpei Ikenoue, Takao Masuda
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Patent number: 4211839Abstract: In a method of producing a composition for use in thermally developable light-sensitive photographic elements comprising mixing: a composition comprising (a) an organic silver salt and (b) a light-sensitive silver halide, and (c) a reducing agent; the improvement wherein (b) is prepared by allowing a light-sensitive silver halide-yielding component to react with (a) in the presence of (d) an imino compound.The elements so produced are also described.Type: GrantFiled: February 7, 1978Date of Patent: July 8, 1980Assignee: Fuji Photo Film Co., Ltd.Inventors: Nobuo Suzuki, Kenji Sashihara, Takao Masuda
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Patent number: 4201583Abstract: A photographic speed-increasing concentration of a certain organic photographic speed-increasing electron acceptor provides increased photographic speed in a charge-sensitive recording composite material having an ohmic resistivity of at least about 1.times.10.sup.10 ohm-cm. The charge-sensitive recording material can comprise (a) a first electrically conducting layer in association with (b) a photoconductor layer, (c) an electrically activated recording layer comprising an image-forming combination of (i) an organic, heavy metal salt oxidizing agent with (ii) a reducing agent and (iii) the described speed-increasing electron acceptor, and a binder, and (d) a second electrical conducting layer. This recording material can be room light handleable and can provide a developed image with increased speed by dry development subsequent to electrical exposure.Type: GrantFiled: November 17, 1978Date of Patent: May 6, 1980Assignee: Eastman Kodak CompanyInventor: Raymond F. Reithel
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Patent number: 4201591Abstract: A photographic speed-increasing concentration of a certain organic photographic speed-increasing electron acceptor provides increased photographic speed in a charge-sensitive recording composite material having an ohmic resistivity of at least about 1.times.10.sup.10 ohm-cm. The charge-sensitive recording material can comprise (a) a first electrically conducting layer in association with (b) a photoconductor layer, (c) an electrically activated recording layer comprising an image-forming combination of (i) an organic, heavy metal salt oxidizing agent with (ii) a reducing agent and (iii) the described speed-increasing electron acceptor, and a binder, and (d) a second electrical conducting layer. This recording material can be room light handleable and can provide a developed image with increased speed by dry development subsequent to electrical exposure.Type: GrantFiled: November 17, 1978Date of Patent: May 6, 1980Assignee: Eastman Kodak CompanyInventor: Raymond F. Reithel
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Patent number: 4201582Abstract: Certain mercapto heterocyclic compounds in certain photothermographic and thermographic elements and compositions containing silver salts of certain heterocyclic thione compounds and an organic reducing agent for the silver salts provide improved developed image tone. In the photothermographic element comprising photographic silver halide in association with the silver salt of heterocyclic thione, a developed and stabilized image, in the absence of a separate stabilizer or stabilizer precursor, with improved tone, is provided by heating the element. The photothermographic element and composition can contain a binder.Type: GrantFiled: December 22, 1975Date of Patent: May 6, 1980Assignee: Eastman Kodak CompanyInventor: Richard L. White
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Patent number: 4175970Abstract: A process for sensitizing photographic gelatino-silver halide emulsions with glutaraldehyde bisulfite in combination with benzene sulfinic acid.Type: GrantFiled: July 24, 1978Date of Patent: November 27, 1979Assignee: E. I. Du Pont de Nemours and CompanyInventor: Raymond J. LeStrange
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Patent number: 4173482Abstract: A dry image forming material comprising (a) a non-photosensitive organic silver salt oxidizing agent, (b) a reducing agent for a silver ion and (c) a halogen molecule, which material is excellent in that a high sensitivity can be obtained and the occurrence of fog is extremely small. The sensitivity can be further improved by incorporation of a halogen ion source in addition to the halogen molecule. Furthermore, the dry image forming material can be improved, with respect to light stability of the raw image forming material and stabilities to heat and humidity, by incorporation of a nickel compound and/or a cobalt compound. In the dry image forming material of this invention, further incorporation of a carboxylic acid anhydride exerts a remarkable anti-fogging effect. The dry image forming material of this invention is non-photosensitive under normal lighting conditions and therefore, can be prepared, handled and stored in a light room.Type: GrantFiled: March 8, 1978Date of Patent: November 6, 1979Assignee: Asahi Kasei Kogyo Kabushiki KaishaInventors: Kageyasu Akashi, Yoshio Hayashi, Tatsumi Arakawa, Takeo Kimura, Hidehiko Kobayashi