Patents by Inventor Katsuhisa Ohzeki
Katsuhisa Ohzeki has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20070196779Abstract: The present invention provides a black and white photothermographic material including, on at least one side of a support, at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent for silver ions, a color developing agent, and a coupler which reacts with an oxidation product of the color developing agent to form a dye, wherein a total amount of ammonia included on one side of the support having thereon the photosensitive silver halide is from 5 mg/m2 to 25 mg/m2, and an optical density of an image formed by imagewise exposing and thermally developing the black and white photothermographic material satisfies the following equation (A): 0.02<Dc<D/4 ??Equation (A) wherein D represents an optical density in a range of from 1 to 2, and Dc represents an optical density obtained by the dye in the optical density of the image.Type: ApplicationFiled: January 25, 2007Publication date: August 23, 2007Inventors: Kouta Fukui, Katsuhisa Ohzeki, Yasuaki Deguchi, Yasuhiro Yoshioka
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Publication number: 20070141518Abstract: A silver halide emulsion containing silver halide grains with a silver chloride content of at least 95 mole %, being sensitized with selenium and gold, and further containing at least two compounds each having a function of oxidizing metallic silver clusters; a silver halide photographic material containing the same; and a silver halide photographic material having red-, green, and blue-sensitive silver halide emulsion layers, wherein one of the emulsion layers contains a silver halide emulsion with a silver chloride content of at least 95 mole %, and the silver halide emulsion contains a selenium compound and a metal complex of formula (D1); [MD1XD1nLD1(6-n)]m??formula (D1) wherein MD1 represents Cr, Mo, Re, Fe, Ru, Os, Co, Rh, Pd, or Pt; XD1 represents a halogen ion; LD1 represents a ligand other than XD1; n represents 3, 4, 5, or 6; and m represents 4-, 3-, 2-, 1-, 0 or 1+.Type: ApplicationFiled: February 7, 2007Publication date: June 21, 2007Inventors: Katsuhisa Ohzeki, Hiroyuki Suzuki, Toshihiro Kariya
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Publication number: 20070065764Abstract: The present invention provides a black and white photothermographic material having, on a support, an image forming layer including at least a photosensitive silver halide, a non-photosensitive organic silver salt, and a compound represented by the following formula (1): wherein R101, R102, R104, and R105 each independently represent a hydrogen atom or a substituent; R103 represents a halogen atom, an alkyl group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an acylamino group, or a sulfonylamino group; and P represents a group forming a phenol compound represented by formula (2) by cleavage of the O—P bond at the time of thermal development.Type: ApplicationFiled: September 18, 2006Publication date: March 22, 2007Inventors: Masahiko Taniguchi, Hideo Hanawa, Katsuhisa Ohzeki, Yasuaki Deguchi
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Publication number: 20070026348Abstract: The present invention provides a black and white photothermographic material including at least a photosensitive silver halide, a non-photosensitive organic silver salt, a reducing agent represented by formula (1), a coupler which reacts with an oxidation product of the reducing agent to form a dye, and at least one development accelerator represented by formula (A-1) or (A-2) on a support: wherein R1, R2, R3, and R4 each independently represent a hydrogen atom or a substituent; and R5 represents an alkyl group, an aryl group, or a heterocyclic group; Q1-NHNH-Q2??Formula (A-1) wherein Q1 represents an aromatic group or a heterocyclic group; and Q2 represents a carbamoyl group or the like; wherein R11 represents an alkyl group, an acyl group, an acylamino group, or the like; R12 represents a hydrogen atom or a substituent; and R13 and R14 represent a substituent.Type: ApplicationFiled: July 10, 2006Publication date: February 1, 2007Inventors: Katsuhisa Ohzeki, Yasuhiro Yoshioka
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Publication number: 20060172235Abstract: A photothermographic material having, on at least one side of a support, an image forming layer including at least a photosensitive silver halide, a non-photosensitive silver salt of a fatty acid, a reducing agent, and a binder, wherein 1) the photosensitive silver halide has an average silver iodide content of 40 mol % or higher, and 2) the photothermographic material includes a compound represented by the following formula (I) or a salt thereof: R1—C?C—R1???Formula (I) wherein R1 and R1? each independently represent a hydrogen atom, or a substituted or unsubstituted alkyl group, aryl group, or heterocyclic group, and R1 and R1? are not simultaneously a hydrogen atom. The invention provides a photothermographic material which exhibits high sensitivity and excellent image storability, and an image forming method.Type: ApplicationFiled: January 27, 2006Publication date: August 3, 2006Inventor: Katsuhisa Ohzeki
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Publication number: 20050202354Abstract: A silver halide emulsion containing silver halide grains with a silver chloride content of at least 95 mole %, being sensitized with selenium and gold, and further containing at least two compounds each having a function of oxidizing metallic silver clusters; a silver halide photographic material containing the same; and a silver halide photographic material having red-, green, and blue-sensitive silver halide emulsion layers, wherein one of the emulsion layers contains a silver halide emulsion with a silver chloride content of at least 95 mole %, and the silver halide emulsion contains a selenium compound and a metal complex of formula (D1); [MD1XD1nLD1(6-n)]m??formula (D1) wherein MD1 represents Cr, Mo, Re, Fe, Ru, Os, Co, Rh, Pd, or Pt; XD1 represents a halogen ion; LD1 represents a ligand other than XD1; n represents 3, 4, 5, or 6; and m represents 4?, 3?, 2?, 1?, 0, or 1+.Type: ApplicationFiled: March 7, 2005Publication date: September 15, 2005Inventors: Katsuhisa Ohzeki, Hiroyuki Suzuki, Toshihiro Kariya
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Patent number: 6878511Abstract: A process of producing a silver halide photographic emulsion containing tabular silver halide grains having an aspect ratio of 5 or more, which comprises using silver halide fine grains as prepared by the following method in at least one of a nucleation step and a growth step of the production of silver halide emulsion, the method comprising mixing at least a silver salt aqueous solution and a halide aqueous solution to prepare silver halide fine grains, wherein one of the silver salt aqueous solution and the halide aqueous solution is introduced as a jet flow into a mixer; a region where the jet flow slows down is provided within the mixer; and the other solution is introduced into the jet flow before the velocity of the jet flow has become {fraction (1/10)} of the velocity at the time when the jet flow comes into the slowing-down region.Type: GrantFiled: April 25, 2003Date of Patent: April 12, 2005Assignee: Fuji Photo Film Co., Ltd.Inventors: Katsuhisa Ohzeki, Tetsuro Mitsui, Haruyasu Nakatsugawa
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Patent number: 6858381Abstract: The mixing state of static mixing is optimized, so that it is possible to form silver halide emulsion particles in small sizes with an excellent mono-dispersion characteristic. An aqueous solution of haloid salt is blown out from a first nozzle into a mixing chamber as a rectilinear flow of turbulent flow, and before eddy viscosity formed when the rectilinear flow is blown out from the first nozzle of a small diameter to the mixing chamber of a greater diameter reaches a maximum, or before a maximum flow speed of the rectilinear flow is reduced to {fraction (1/10)} or below, an aqueous solution of silver nitrate is blown out from a second nozzle as a crossflow of turbulent flow which crosses the rectilinear flow at a substantially right angle and is entrained by the rectilinear flow, so that the two solutions are allowed to mix and react with each other instantaneously, and a liquid resulting from the mixing and reaction is discharged from a discharge duct.Type: GrantFiled: April 23, 2003Date of Patent: February 22, 2005Assignee: Fuji Photo Film Co., Ltd.Inventors: Yasunori Ichikawa, Katsuhisa Ohzeki, Fumiko Shiraishi, Tetsurou Mitsui, Shigeharu Urabe, Nobuo Nishida, Kenichi Harashima
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Publication number: 20040191707Abstract: A process for the preparation of an emulsion of silver halide fine grains having a number-average equivalent circle diameter of 100 nm or less and coefficient of variation in equivalent circle diameter of 40% or less, wherein the fine grains are prepared via at least one Ostwald ripening step.Type: ApplicationFiled: March 22, 2004Publication date: September 30, 2004Inventors: Tetsurou Mitsui, Masayuki Hayashi, Katsuhisa Ohzeki
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Publication number: 20040131538Abstract: A method of producing (1) metal particles or (2) metal fine-particles, which contains: jetting out two solutions of (1) a metal salt solution and a reducing agent solution, or (2) a metal ion-containing solution and a hydroxide ion-containing solution, from respective nozzles to a mixing chamber, to give a mixed reaction solution; and discharging the mixed reaction solution from a discharging port having a diameter smaller than a diameter of the mixing chamber, wherein one of the two solutions is made into straightly-going flow, which is jetted from a nozzle having a diameter smaller than the diameter of the mixing chamber to the mixing chamber, and the other solution is jetted out, as flow substantially orthogonal to the straightly-going flow, to a position before a position where eddy viscosity generated by the straightly-going flow would be maximum.Type: ApplicationFiled: September 26, 2003Publication date: July 8, 2004Applicant: FUJI PHOTO FILM CO., LTD.Inventor: Katsuhisa Ohzeki
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Patent number: 6677109Abstract: A producing method of a silver halide emulsion comprising the steps of adding silver halide fine grains AgX0 having an to a silver halide seed crystal emulsion containing at least water, dispersion medium 1 and silver halide crystal, and growing the seed crystal by dissolving the added AgX0, wherein AgX0 are formed in dispersion medium solution 2 containing dispersion medium 2, the pH of dispersion medium solution 2 of the time when AgX0 are formed is from 7.3 to 12.2, the average equivalent-circle projected area diameter of AgX0 is from 0.001 to 0.2 &mgr;m, and AgX0 are non-twin crystal grains not substantially having twin planes.Type: GrantFiled: January 27, 2003Date of Patent: January 13, 2004Assignee: Fuji Photo Film Co., Ltd.Inventors: Mitsuo Saitou, Masaaki Miki, Katsuhisa Ohzeki
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Publication number: 20030232292Abstract: A process of producing a silver halide photographic emulsion containing tabular silver halide grains having an aspect ratio of 5 or more, which comprises using silver halide fine grains as prepared by the following method in at least one of a nucleation step and a growth step of the production of silver halide emulsion, the method comprising mixing at least a silver salt aqueous solution and a halide aqueous solution to prepare silver halide fine grains, wherein one of the silver salt aqueous solution and the halide aqueous solution is introduced as a jet flow into a mixer; a region where the jet flow slows down is provided within the mixer; and the other solution is introduced into the jet flow before the velocity of the jet flow has become {fraction (1/10)} of the velocity at the time when the jet flow comes into the slowing-down region.Type: ApplicationFiled: April 25, 2003Publication date: December 18, 2003Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Katsuhisa Ohzeki, Tetsuro Mitsui, Haruyasu Nakatsugawa
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Publication number: 20030224308Abstract: The mixing state of static mixing is optimized, so that it is possible to form silver halide emulsion particles in small sizes with an excellent mono-dispersion characteristic. An aqueous solution of haloid salt is blown out from a first nozzle into a mixing chamber as a rectilinear flow of turbulent flow, and before eddy viscosity formed when the rectilinear flow is blown out from the first nozzle of a small diameter to the mixing chamber of a greater diameter reaches a maximum, or before a maximum flow speed of the rectilinear flow is reduced to {fraction (1/10)} or below, an aqueous solution of silver nitrate is blown out from a second nozzle as a crossflow of turbulent flow which crosses the rectilinear flow at a substantially right angle and is entrained by the rectilinear flow, so that the two solutions are allowed to mix and react with each other instantaneously, and a liquid resulting from the mixing and reaction is discharged from a discharge duct.Type: ApplicationFiled: April 23, 2003Publication date: December 4, 2003Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Yasunori Ichikawa, Katsuhisa Ohzeki, Fumiko Shiraishi, Tetsurou Mitsui, Shigeharu Urabe, Nobuo Nishida, Kenichi Harashima
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Patent number: 6649336Abstract: A silver halide photographic light-sensitive material is disclosed, including at least one silver halide emulsion layer, wherein the silver halide grain contained in the emulsion layer is silver chloroiodide or silver chloroiodobromide having a silver chloride content of 90 mol % or more and a silver iodide content of 0.01 to 1.0 mol %, at least one hexacyano complex is doped in an amount of at least 1×10−7 mol % based on the total silver amount, and the emulsion layer contains a methine dye represented by the formula (I) as defined.Type: GrantFiled: September 25, 2001Date of Patent: November 18, 2003Assignee: Fuji Photo Film Co., LTDInventors: Katsuhisa Ohzeki, Tetsuo Nakamura
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Publication number: 20030207220Abstract: A producing method of a silver halide emulsion comprising the steps of adding silver halide fine grains AgX0 having an to a silver halide seed crystal emulsion containing at least water, dispersion medium 1 and silver halide crystal, and growing the seed crystal by dissolving the added AgX0, wherein AgX0 are formed in dispersion medium solution 2 containing dispersion medium 2, the pH of dispersion medium solution 2 of the time when AgX0 are formed is from 7.3 to 12.2, the average equivalent-circle projected area diameter of AgX0 is from 0.001 to 0.2 &mgr;m, and AgX0 are non-twin crystal grains not substantially having twin planes.Type: ApplicationFiled: January 27, 2003Publication date: November 6, 2003Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Mitsuo Saitou, Masaaki Miki, Katsuhisa Ohzeki
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Publication number: 20030148234Abstract: A producing method of a silver halide emulsion comprising the steps of adding silver halide fine grains AgX0 having an to a silver halide seed crystal emulsion containing at least water, dispersion medium 1 and silver halide crystal, and growing the seed crystal by dissolving the added AgX0, wherein AgX0 are formed in dispersion medium solution 2 containing dispersion medium 2, the pH of dispersion medium solution 2 of the time when AgX0 are formed is from 7.3 to 12.2, the average equivalent-circle projected area diameter of AgX0 is from 0.001 to 0.2 &mgr;m, and AgX0 are non-twin crystal grains not substantially having twin planes.Type: ApplicationFiled: September 24, 2002Publication date: August 7, 2003Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Mitsuo Saitou, Masaaki Miki, Katsuhisa Ohzeki
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Patent number: 6566044Abstract: The present invention provides a silver halide photographic material that is excellent in photographic speed as well as image graininess and exhibits low residual color even after rapid processing. The silver halide photographic material contains a compound represented by formula (I) and a compound represented by formula (II), as defined.Type: GrantFiled: March 26, 2001Date of Patent: May 20, 2003Assignee: Fuji Photo Film Co., Ltd.Inventors: Katsuhisa Ohzeki, Tetsuo Nakamura, Takanori Hioki
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Publication number: 20020110764Abstract: The present invention provides a silver halide photographic material that is excellent in photographic speed as well as image graininess and exhibits low residual color even after rapid processing. The silver halide photographic material contains a compound represented by formula (I) and a compound represented by formula (II), as defined.Type: ApplicationFiled: March 26, 2001Publication date: August 15, 2002Inventors: Katsuhisa Ohzeki, Tetsuo Nakamura, Takanori Hioki
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Publication number: 20020072019Abstract: A silver halide photographic light-sensitive material is disclosed, comprising at least one silver halide emulsion layer, wherein the silver halide grain contained in said emulsion layer is silver chloroiodide or silver chloroiodobromide having a silver chloride content of 90 mol % or more and a silver iodide content of 0.01 to 1.Type: ApplicationFiled: September 25, 2001Publication date: June 13, 2002Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Katsuhisa Ohzeki, Tetsuo Nakamura
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Publication number: 20020058216Abstract: Disclosed is a silver halide photographic material which comprises at least one methine dye represented by the following formula (I): 1Type: ApplicationFiled: August 17, 2001Publication date: May 16, 2002Applicant: FUJI PHOTO FILM CO., LTD.Inventors: Tetsuo Nakamura, Takanori Hioki, Katsuhisa Ohzeki, Naoyuki Hanaki