Patents by Inventor Keiso Saeki
Keiso Saeki 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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Patent number: 5055373Abstract: A multicolor recording material is disclosed, which comprises a support having provided thereon a coating layer comprising two or more kinds of microcapsules each containing at least a leuco dye capable of being colored by oxidation and a photo oxidizing agent outside said microcapsules, and a reducing agent as necessary components, with two or more leuco dyes capable of forming different colors from each other being retained in different kinds of said microcapusles respectively composed of walls of high polymers having different glass transition points.Type: GrantFiled: September 29, 1989Date of Patent: October 8, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Fumiaki Shinozaki, Toshiaki Endo
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Patent number: 5051333Abstract: An optical image-recording material comprising:(a) microcapsules, in which at least one leuco dye capable of forming a color by oxidation and at least one photo-oxidizing agent are enclosed together, and (b) at least one reducing agent not enclosed in the microcapsules, or(c) microcapsules, in which at least one reducing agent is enclosed, and (d) both at least one leuco dye capable of forming a color by oxidation and at least one photo-oxidizing agent not enclosed in the microcapsules,wherein the microcapsules have capsule walls made from a material which lowers its permeability barrier to at least one component selected from the photo-oxidizing agent and the reducing agent when the capsule wall material is heated above its glass transition temperature, and the leuco dye is a xanthene compound having an N-substituted anilino group substituted by an electron attracting group.Type: GrantFiled: June 21, 1990Date of Patent: September 24, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Naoto Yanagihara, Ken Iwakura, Tosiaki Endo, Keiso Saeki
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Patent number: 5035974Abstract: A light-image forming material comprising a support having provided thereon a light-image forming layer comprising microcapsules containing an oxidative-developable leuco dye and a photo-oxidizing agent, and a reducing agent as essential ingredients, wherein the material also includes a covering layer or intermediate layer containing a film-forming high-molecular binder and/or an inorganic or organic pigment.Type: GrantFiled: June 15, 1989Date of Patent: July 30, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Toshiaki Endo
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Patent number: 4985331Abstract: Multi-color recording materials where the color forming layers are established on the same side of the support are disclosed.Type: GrantFiled: November 27, 1989Date of Patent: January 15, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Fumiaki Shinozaki, Yutaka Fujita
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Patent number: 4981769Abstract: A light image forming material comprising a support having provided thereon a layer comprising microcapsules containing a leuco dye capable of developing a color through oxidation and a photo oxidizing agent, a reducing agent provided outside the microcapsules, and the layer further comprising carboxy-modified polyvinyl alcohol and epoxidated polyamide resin for imparting high water resistivity.Type: GrantFiled: August 18, 1989Date of Patent: January 1, 1991Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Tosiaki Endo
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Patent number: 4962009Abstract: An image-forming material comprising: (a) microcapsules, in which at least one leuco dye capable of developing a color by oxidation and at least one photooxidizing agent (preferably a combination of a lophine dimer and an organic halogeno-compound) are enclosed together, and (b) at least one reducing agent not enclosed in the microcapsules (preferably present in the form of an emulsified dispersion), thereby achieving image formation in a completely dried condition, and ensuring excellent freshness keeping property, image reproducibility and fixability.Type: GrantFiled: October 14, 1988Date of Patent: October 9, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Shintaro Washizu, Jun Yamaguchi, Fumiaki Shinozaki, Akihiro Shimomura, Toshimasa Usami, Toshiaki Endo, Keiso Saeki
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Patent number: 4942107Abstract: An image-forming material and an image recording method for using the same are disclosed. The image-forming material comprises microcapsule and a reducing agent which is present outside of the microcapsules, wherein the microcapsules contain (a) a leuco dye capable of oxidatively developing a color, (b) a photo-oxidizing agent, and (c) a phenolic compound. The image-forming material exhibits excellent image reproducibility, preservability before use, and image preservability.Type: GrantFiled: March 8, 1989Date of Patent: July 17, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Tosiaki Endo, Masato Satomura, Fumiaki Shinozaki
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Patent number: 4929530Abstract: An optical image forming material comprising a support (A) at least one member selected from the group consisting of oxidative-developable leuco dyes, (B) at least one member selected from the group consisting of photo-oxidizing agents, (C) at least one reducing agent and (D) at least one organic sulfonamide compound and/or at least one member selected from the group consisting of hydroxy compounds represented by the following formula (I) or (II) ##STR1## wherein R.sub.1 to R.sub.11 are as described herein, the leuco dye (A) and the photo-oxidizing agent (B) being present in microcapsules, and the reducing agent (C) and the organic sulfonamide compound and/or the hydroxy compound (D) being present outside of the microcapsules.Type: GrantFiled: March 16, 1989Date of Patent: May 29, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Tosiaki Endo
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Patent number: 4918045Abstract: A recording material comprising a support, a microcapsule containing a substantially colorless electron-donating color former and a solvent, and an electron-accepting developer, wherein the color former is at least one selected from p-substituted aminophenylindolylphthalide derivatives, p-substituted aminophenylindolylazaphthalide derivatives and p-substituted aminophenylindolyldiazaphthalide derivatives, the solvent is a paraffin oil, and the amount of the solvent is at least 20% by weight based on the weight of the core substance.Type: GrantFiled: July 15, 1988Date of Patent: April 17, 1990Assignee: Fuji Photo Film Co., Ltd.Inventors: Katsumi Matsuoka, Masanobu Takashima, Ken Iwakura, Keiso Saeki
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Patent number: 4888334Abstract: A pressure-sensitive microcapsule sheet comprising a support having thereon a pressure-sensitive layer comprising microcapsules and a binder comprising a copolymer latex composed of at least two monomers selected from the group consisting of an aliphatic conjugated diolefin monomer, an aromatic vinyl monomer and an ethylenically unsaturated nitrile monomer and an ethylenically unsaturated acid amide monomer. The sheet is free from color stain and fog during printing.Type: GrantFiled: April 19, 1988Date of Patent: December 19, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Kunihiko Ohga, Keiso Saeki
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Patent number: 4876233Abstract: A recording material comprising a support provided thereon a color developer and microcapsules containing a substantially colorless color former is disclosed, wherein the microcapsules further contains at least one of nickel compounds represented by formulae (I) and (II) shown in the specification. The microcapsules exhibit excellent light-resistance, and a color image developed exhibits excellent light-fastness.Type: GrantFiled: December 15, 1988Date of Patent: October 24, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Shojiro Sano, Katsumi Matsuoka, Masanobu Takashima, Ken Iwakura
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Patent number: 4870048Abstract: A color developer sheet which brings about color development by contact with a substantially colorless electron-donating color former, where said sheet contains an organometallic compound represented by the following general formula (I), (II) or (III) to enhance light resistance and stability of the color product obtained by the color development: ##STR1## wherein M represents a nickel atom, a copper atom, a cobalt atom, or a zinc atom; X.sub.1 and X.sub.2 each represents an oxygen atom, a sulfur atom, or --NR.sub.5 --, in which R.sub.5 represents a hydrogen atom, an alkyl group, an aryl group, or a hydroxyl group; X.sub.3 represents a hydroxyl group, or a mercapto group; Y represents an oxygen atom, a sulfur atom, or --CHR.sub.6, in which R.sub.6 represents a hydrogen atom, an alkyl group, or an aryl group; R.sub.1, R.sub.2, R.sub.3 and R.sub.Type: GrantFiled: April 8, 1988Date of Patent: September 26, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Katsumi Matsuoka, Shojiro Sano, Keiso Saeki, Masanobu Takashima, Ken Iwakura
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Patent number: 4861748Abstract: A recording material containing the combination of at least one electron-donating colorless dye containing a p-substituted aminophenylindolyl azaphthalide and at least one electron-accepting compound containing an organic acid having at least one phenolic hydroxyl group. The material provides colored images having improved stability.Type: GrantFiled: July 9, 1987Date of Patent: August 29, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Masanobu Takashima, Ken Iwakura
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Patent number: 4849397Abstract: A pressure-sensitive recording medium producing a colored image utilizing the reaction between a substantially colorless electron donating dye precursor and an electron accepting developer is disclosed. This recording sheet is characterized in that the electron accepting developer layer contains an aromatic carboxylic acid metal salt and the electron donating dye precursor layer contains (a) an indolylazaphthalide compound and (b) Crystal Violet lactone.Type: GrantFiled: October 21, 1988Date of Patent: July 18, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Shojiro Sano, Keiso Saeki
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Patent number: 4840927Abstract: A desensitizer composition consisting essentially of a 2,2,6,6-tetramethylpyperidine compound as a desensitizer and additives comprising a natural or synthetic high-molecular weight compound and a pigment, a color developer sheet containing the desensitizer composition and a process for forming an image using the color developer sheet. The composition exhibits superior desensitizing effects, especially when used with fluoran color formers.Type: GrantFiled: September 9, 1986Date of Patent: June 20, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Shojiro Sano, Keiso Saeki
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Patent number: 4822768Abstract: A pressure-sensitive recording sheet which forms a colored image by the reaction of an electron donating color former with an electron accepting developer, comprising a support having provided thereon a micro-encapsulated electron donating color former and an electron accepting developer is disclosed, wherein one or more layers containing the microencapsulated electron donating color former contains at least one pigment having a pH of 8.5 or more.Type: GrantFiled: October 26, 1987Date of Patent: April 18, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Kunihiko Ohga, Keiso Saeki
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Patent number: 4820684Abstract: A pressure-sensitive recording sheet is disclosed. The sheet produces a color image by reaction between a substantially colorless electron donating dye precursor and an electron accepting color developer, wherein a layer containing said electron accepting color developer contains (a) a metal salt of an aromatic carboxylic acid and (b) a zinc salt of dithiocarbamic acid represented by formula (I) ##STR1## wherein R.sub.1 and R.sub.2 each represents an alkyl or aryl group.Type: GrantFiled: June 13, 1986Date of Patent: April 11, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Shojiro Sano, Keiso Saeki
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Patent number: 4803192Abstract: A recording material containing the combination of a colorless dye comprising a p-substituted aminophenylindolylphthalide moiety and an electron-accepting compound comprising an organic acid having at least one phenolic hydroxyl group. The dye image obtained by the recording material is stable.Type: GrantFiled: July 9, 1987Date of Patent: February 7, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Masanobu Takashima, Ken Iwakura
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Patent number: 4800193Abstract: A recording material comprising an electron-donating colorless dye and an electron accepting compound, wherein said electron-donating colorless dye is represented by the following general formula (I): ##STR1## wherein R and R' each represents an alkyl group; R.sub.1 represents an aralkyl group, or an alkyl group substituted with an alkoxy or aryloxy group; R.sub.2 and R.sub.3, which may be the same or different, each represents a hydrogen atom, an alkyl group, or an aryl group; and X, Y, and Z, which may be the same or different, each represents a hydrogen atom, an alkyl group, an alkoxy group, an aryloxy group, a halogen atom, or a substituted amino group.The recording material is excellent in light resistance and solubility in an organic solvent.Type: GrantFiled: July 28, 1987Date of Patent: January 24, 1989Assignee: Fuji Photo Film Co., Ltd.Inventors: Keiso Saeki, Masanobu Takashima, Ken Iwakura, Takekatsu Sugiyama, Masato Satomura
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Patent number: 4792543Abstract: A pressure-sensitive recording sheet is disclosed. The sheet comprises a support having provided thereon a color-forming layer containing microcapsules prepared by encapsulating oil droplets having dissolved therein one or more substantially colorless color formers, wherein said microcapsules contain a compound represented by formula (I) ##STR1## wherein A and B each represents an alkylene group having from 1 to 12 carbon atoms or an alkenylene group having from 2 to 12 carbon atoms; R represents an alkyl group having from 1 to 18 carbon atoms; and n represents an integer of from 5 to 50.Type: GrantFiled: June 17, 1987Date of Patent: December 20, 1988Assignee: Fuji Photo Film Co., Ltd.Inventors: Shojiro Sano, Keiso Saeki