Patents by Inventor Katsura Ito
Katsura Ito 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: 7335620Abstract: An object of the present invention is to provide a photocatalytic powder containing titanium dioxide fine particles containing an anionically active substance, where the electrokinetic potential of the fine particle is from about ?100 to 0 mV in an aqueous environment at pH 5. Another object of the present invention is to provide a photocatalytic slurry containing the powder, and a polymer composition, a coating agent, a photocatalytic functional molded article and a photocatalytic functional structure using the powder.Type: GrantFiled: December 2, 2003Date of Patent: February 26, 2008Assignee: Showa Denko K.K.Inventors: Katsura Ito, Hiroyuki Hagihara
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Patent number: 7037352Abstract: By providing an abrasive having a ratio of volume-cumulative (95%) average particle size (D95) to volume-cumulative (50%) average particle size (D50) (D95/D50) falling within a range of 1.2 to 3.0 or an abrasive having a volume-cumulative (95%) average particle size (D95) falling within a range of 0.1-1.5 ?m and containing coarse particles having a size more than 10 times the volume-cumulative (50%) average particle size (D50) in an amount, based on the total mass of all the particles, of 1 mass % or less, there can be provided an abrasive, an abrasive slurry, a method for producing an abrasive, and a polishing method which attain, during accurate polishing of substrates such as electronics substrates, a high removal rate and a high-quality surface; i.e., a surface having a high flatness, low surface roughness, and substantially no microscratches or micropits.Type: GrantFiled: December 12, 2001Date of Patent: May 2, 2006Assignee: Showa Denko Kabushiki KaishaInventors: Katsura Ito, Hiroshi Saegusa, Tomoyuki Masuda, Fumio Imai
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Patent number: 6989054Abstract: A titanium dioxide slurry for ink jet ink, which comprises water and surface-treated titanium dioxide particles dispersed in the water, the surface treatment being a treatment with an inorganic phosphoric acid compound. Also disclosed is an ink comprising the titanium dioxide slurry.Type: GrantFiled: March 12, 2002Date of Patent: January 24, 2006Assignee: Seiko Epson CorporationInventors: Seiichi Tanabe, Kiyohiko Takemoto, Seiji Mochizuki, Yasunori Yamazaki, Toshimasa Mori, Kasumi Nakamura, Nobuo Uotani, Toshio Koshikawa, Katsura Ito
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Publication number: 20050287931Abstract: A polishing slurry comprising an abrasive comprising as a basic ingredient rare earth oxides containing cerium oxide, which polishing slurry further comprises an anionic surfactant and a nonionic surfactant and has a pH value of at least 11. The polishing slurry is especially suitable for polishing a glass substrate for magnetic disc, and other substrates used in electronic field.Type: ApplicationFiled: October 24, 2003Publication date: December 29, 2005Applicant: Showa Denko K.K.Inventors: Hiroshi Saegusa, Fumio Imai, Katsura Ito
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Publication number: 20040121903Abstract: An object of the present invention is to provide a photocatalytic powder containing titanium dioxide fine particles containing an anionically active substance, where the electrokinetic potential of the fine particle is from about −100 to 0 mV in an aqueous environment at pH 5. Another object of the present invention is to provide a photocatalytic slurry containing the powder, and a polymer composition, a coating agent, a photocatalytic functional molded article and a photocatalytic functional structure using the powder.Type: ApplicationFiled: December 2, 2003Publication date: June 24, 2004Applicant: SHOWA DENKO K.K.Inventors: Katsura Ito, Hiroyuki Hagihara
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Publication number: 20040025442Abstract: A composition for use in texturing includes (i) microparticles or powder formed of at least one species selected from the group consisting of diamond, CBN, alumina and silicon carbide; (ii) at least one species selected from the group consisting of C2-C5 polyhydric alcohols, polycondensed products of the alcohols and alkylene glycol monoalkyl ethers represented by formula R1O(CnH2nO)mH (wherein R1 represents a C1-C4 linear or branched alkyl group, m is an integer of 1 to 3 and n is 2 or 3); and (iii) a C10-C22 fatty acid. When polishing a substrate using the composition, it is possible to form minute texturing lines, remove “polish lines” and “polish scratches” and minimize the mean surface roughness (Ra) of the undercoat layer of the substrate after texturing.Type: ApplicationFiled: January 3, 2003Publication date: February 12, 2004Inventors: Katsura Ito, Jiro Yamada, Kimihiro Hon, Megumi Kanda
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Patent number: 6683023Abstract: An object of the present invention is to provide a photocatalytic powder containing titanium dioxide fine particles containing an anionically active substance, where the electrokinetic potential of the fine particle is from about -100 to 0 mV in an aqueous environment at pH 5. Another object of the present invention is to provide a photocatalytic slurry containing the powder, and a polymer composition, a coating agent, a photocatalytic functional molded article and a photocatalytic functional structure using the powder.Type: GrantFiled: April 23, 2001Date of Patent: January 27, 2004Assignee: Showa Denko K.K.Inventors: Katsura Ito, Hiroyuki Hagihara
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Publication number: 20030052952Abstract: A titanium dioxide slurry for ink jet ink, which comprises water and surface-treated titanium dioxide particles dispersed in the water, the surface treatment being a treatment with an inorganic phosphoric acid compound. Also disclosed is an ink comprising the titanium dioxide slurry.Type: ApplicationFiled: March 12, 2002Publication date: March 20, 2003Applicant: SEIKO EPSON CORPORATIONInventors: Seiichi Tanabe, Kiyohiko Takemoto, Seiji Mochizuki, Yasunori Yamazaki, Toshimasa Mori, Kasumi Nakamura, Nobuo Uotani, Toshio Koshikawa, Katsura Ito
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Publication number: 20020129559Abstract: By providing an abrasive having a ratio of volume-cumulative (95%) average particle size (D95) to volume-cumulative (50%) average particle size (D50) (D95/D50) falling within a range of 1.2 to 3.0 or an abrasive having a volume-cumulative (95%) average particle size (D95) falling within a range of 0.1-1.5 &mgr;m and containing coarse particles having a size more than 10 times the volume-cumulative (50%) average particle size (D50) in an amount, based on the total mass of all the particles, of 1 mass % or less, there can be provided an abrasive, an abrasive slurry, a method for producing an abrasive, and a polishing method which attain, during accurate polishing of substrates such as electronics substrates, a high removal rate and a high-quality surface; i.e., a surface having a high flatness, low surface roughness, and substantially no microscratches or micropits.Type: ApplicationFiled: December 12, 2001Publication date: September 19, 2002Applicant: Showa Denko Kabushiki KaishaInventors: Katsura Ito, Hiroshi Saegusa, Tomoyuki Masuda, Fumio Imai
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Patent number: 6407156Abstract: A photocatalytic powder comprising finely divided titanium dioxide particles having a coating of a substantially water-insoluble organic substance on the surface of each titanium dioxide particle. The photocatalytic powder is made by adding an insolubilizer to a slurry containing finely divided titanium dioxide particles and a water-soluble organic substance to form a coating of an substantially water-insoluble organic substance on the surface of each titanium dioxide particle. The photocatalytic powder is used in the form of a mixture with an organic polymer for making a shaped article having good environmental clarifying property, or is supported on the surface of a structure to provide a structure having good environmental clarifying property.Type: GrantFiled: September 7, 2000Date of Patent: June 18, 2002Assignee: Showa Denko Kabusiki KaishaInventors: Hiroyuki Hagihara, Katsura Ito
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Patent number: 6383980Abstract: A photocatalytic titanium dioxide powder comprised of finely divided titanium dioxide particles each having supported on the surface thereof a first supported layer of a calcium compound and further having on the surface of the first supported layer-formed particles a porous second supported layer of a photocatalytically inactive and substantially water-insoluble substance. The photocatalytic titanium dioxide powder is produced by allowing a calcium compound to be supported on the surface of finely divided titanium dioxide particles to form the first supported layer; and then, allowing a precursor material capable of forming the photocatalytically inactive and substantially water-insoluble substance to be supported on the surface of the first supported layer-formed particles, followed by converting the precursor a material to said water-insoluble substance to thereby form the porous second supported layer.Type: GrantFiled: September 8, 2000Date of Patent: May 7, 2002Assignee: Showa Denko Kabushiki KaishaInventors: Hiroyuki Hagihara, Katsura Ito
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Publication number: 20010046944Abstract: An object of the present invention is to provide a photocatalytic powder containing titanium dioxide fine particles containing an anionically active substance, where the electrokinetic potential of the fine particle is from about -100 to 0 mV in an aqueous environment at pH 5. Another object of the present invention is to provide a photocatalytic slurry containing the powder, and a polymer composition, a coating agent, a photocatalytic functional molded article and a photocatalytic functional structure using the powder.Type: ApplicationFiled: April 23, 2001Publication date: November 29, 2001Inventors: Katsura Ito, Hiroyuki Hagihara
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Patent number: 6291067Abstract: A photocatalytic powder for environmental clarification, comprising finely divided titanium dioxide particles having a coating of porous calcium phosphate formed on at least part of the surface of each titanium dioxide particle, wherein an anionic surface active agent is present at least on the interface between said coating of porous calcium phosphate and the titanium dioxide particle. This photocatalytic powder is produced by dispersing finely divided titanium dioxide particles in an aqueous slurry containing an anionic surface active agent, and then forming a coating of porous calcium phosphate on at least part of the surface of each titanium dioxide particle. This photocatalytic powder is used, for example, by supporting it in an organic polymer shaped article.Type: GrantFiled: July 14, 2000Date of Patent: September 18, 2001Assignees: Japan as represented by Director General of the Agency of Industrial Science and Technology, Showa Denko Kabushiki KaishaInventors: Hiroshi Taoda, Toru Nonami, Katsura Ito, Hiroyuki Hagihara
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Patent number: 6245140Abstract: A surface-fluorinated metal oxide particulate comprising a metal oxide particulate selected from titanium, aluminum, silicon, silver, copper, zirconium, zinc, tin, germanium, tantalum and the like, being reacted with fluorine and a process for manufacturing such surface-treated metal oxide particulates are disclosed. The process allows easy and efficient fluorination of the surface of metal oxide particulates in any desired ratio. The surface-fluorinated metal oxide particulates of the present invention are useful as an additive for weatherable paints, weatherable resins, cosmetics and the like.Type: GrantFiled: December 19, 1997Date of Patent: June 12, 2001Assignee: Showa Denko K.K.Inventors: Ryuji Monden, Chozo Inoue, Jun Tanaka, Hiroyuki Hagihara, Hiroyasu Taguchi, Hiroyuki Takahashi, Manabu Ohira, Katsura Ito
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Patent number: 6107390Abstract: A resin composition comprising a thermoplastic resin and a titanium dioxide (TiO.sub.2) pigment and having a moisture content of 10-1,400 ppm as determined by a specific method. A preferable resin composition is made by (i) atomizing 0.1-3.0 wt. parts of an organopolysiloxane within a fluidized powder layer of 100 wt. parts of TiO.sub.2 pigment; (ii) mixing 1-5 wt. parts of a metallic soap with 100 wt. parts of the TiO.sub.2 pigment; (iii) heat-treating the thus-obtained mixture at 70-200.degree. C. for 10 min-2 hours; and then, (iv) mixing a thermoplastic resin with the heat-treated mixture. The resin composition is used for coating paper or film, when it contains 20-60 wt. % of TiO.sub.2 pigment. The resin composition is used as a master batch for the preparation of a resin composition for coating paper or film, when it contains 30-80 wt. % of TiO.sub.2 pigment.Type: GrantFiled: March 30, 1999Date of Patent: August 22, 2000Assignee: Showa Denko K.K.Inventors: Masashi Maeda, Katsura Ito
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Patent number: 6090736Abstract: A photocatalytic powder for environmental clarification, comprising finely divided titanium dioxide particles having a coating of porous calcium phosphate formed on at least part of the surface of each titanium dioxide particle, wherein an anionic surface active agent is present at least on the interface between said coating of porous calcium phosphate and the titanium dioxide particle. This photocatalytic powder is produced by dispersing finely divided titanium dioxide particles in an aqueous slurry containing an anionic surface active agent, and then forming a coating of porous calcium phosphate on at least part of the surface of each titanium dioxide particle. This photocatalytic powder is used, for example, by supporting it in an organic polymer shaped article.Type: GrantFiled: December 28, 1998Date of Patent: July 18, 2000Assignees: Agency of Industrial Science and Technology, Showa Denko Kabushiki Kaisha, Hiroshi Taoda, Toru NonamiInventors: Hiroshi Taoda, Toru Nonami, Katsura Ito, Hiroyuki Hagihara
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Patent number: 6017993Abstract: A resin composition comprising a thermoplastic resin and a titanium dioxide (TiO.sub.2) pigment and having a moisture content of 10-1,400 ppm as determined by a specific method. A preferable resin composition is made by (i) atomizing 0.1-3.0 wt. parts of an organopolysiloxane within a fluidized powder layer of 100 wt. parts of TiO.sub.2 pigment; (ii) mixing 1-5 wt. parts of a metallic soap with 100 wt. parts of the TiO.sub.2 pigment; (iii) heat-treating the thus-obtained mixture at 70-200.degree. C. for 10 min-2 hours; and then (iv) mixing a thermoplastic resin with the heat-treated mixture. The resin composition is used for coating paper or film, when it contains 20-60 wt. % of TiO.sub.2 pigment. The resin composition is used as a master batch for the preparation of a resin composition for coating paper or film, when it contains 30-80 wt. % of TiO.sub.2 pigment.Type: GrantFiled: August 8, 1997Date of Patent: January 25, 2000Assignee: Showa Denko Kabushiki KaishaInventors: Masashi Maeda, Katsura Ito
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Patent number: 5358660Abstract: Magnetic particles for perpendicular magnetic recording, which are hexagonal ferrite particles having a hexagonal platelet shape, and are represented by the formula MM'.sub.x M".sub.y Fe.sub.2x-y+2z O.sub.1+4x+3z (wherein M represents at least one element or a combination of elements selected from Ba, Sr, Ca and Pb; M' is at least one element or a combination of elements selected from Co, Zn and Mn; M" is at least one element or a combination of elements selected from Co, Ti, In, Zn, Mn, Ge, Nb, Zr, Ta, V and Sn, x is a number of z/4 to z, inclusive; y is a number of 0 to (x+z)/3, inclusive; and z is a number of 5.5 to 9.0, inclusive), and has an average particle size of from 0.01 to 0.3 .mu.m. The magnetic particles have a novel crystal structure different from both the magnetoplumbite structure and the spinel structure, even internally of the individual particles.Type: GrantFiled: July 20, 1992Date of Patent: October 25, 1994Assignee: Showa Denko Kabushiki KaishaInventors: Takanori Kidoh, Katsura Ito, Kenzo Hanawa
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Patent number: 5015338Abstract: A method for preparing a stamper comprises the steps of forming a first electro-conductive layer and a second electro-conductive layer on a photoresist layer carrying pits through a physical vapor deposition before the electroforming of a stamper layer. The second electro-conductive layer is effective for preventing the first electro-conductive layer from corroding during the electroforming step because of the active treatment solution for the electroforming and also avoids the corrosion of the first electro-conductive layer even in the storage period before the particular electroforming step.Type: GrantFiled: May 2, 1989Date of Patent: May 14, 1991Assignee: Pioneer Electronic Corp.Inventors: Hirotoshi Tabuchi, Osamu Kumasaka, Katsura Ito, Kenji Koushiro