Patents by Inventor Isao Ota
Isao Ota 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: 20240125559Abstract: A body sheet for a vapor chamber includes a first body surface, a second body surface disposed opposite to the first body surface, and a penetration space extending from the first body surface to the second body surface. The penetration space extends in a first direction in plan view. As seen in a cross section perpendicular to the first direction, the penetration space includes a first opening positioned on the first body surface and a second opening positioned on the second body surface. The second opening extends from a region overlapping with the first opening in plan view to a position overlapping with the first groove in plan view.Type: ApplicationFiled: February 2, 2022Publication date: April 18, 2024Applicant: DAI NIPPON PRINTING CO., LTD.Inventors: Kazunori ODA, Shinichiro TAKAHASHI, Takayuki OTA, Toshihiko TAKEDA, Shinya KIURA, Makoto YAMAKI, Isao INOUE
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Patent number: 8323368Abstract: [Problems to Be Solved] To provide a method for obtaining a polishing composition by which a polishing speed is high and the polished surface has little surface failure. [Means to Solve the Problems] The present invention relates to a production method of a polishing composition containing zirconia oxide sol including: baking at a temperature ranging from 400 to 1000° C.Type: GrantFiled: May 10, 2006Date of Patent: December 4, 2012Assignee: Nissan Chemical Industries, Ltd.Inventors: Noriyuki Takakuma, Isao Ota, Kenji Tanimoto
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Publication number: 20110281958Abstract: There is provided a production method of an yttrium oxide-stabilized zirconium oxide aqueous sol and organic solvent sol capable of producing a sol having extremely advantageous transparency with which the heating condition is eased compared to that of a conventional method and secondary aggregation of the obtained colloidal particle is hardly caused. A production method of an yttrium oxide-stabilized zirconium oxide aqueous sol, characterized by comprising: a process of subjecting a mixed aqueous solution produced by dissolving an yttrium carboxylate and zirconium oxyacetate in water in an Y/(Y+Zr) atomic ratio in a range of 0.10 to 0.60 to hydrothermal treatment at 160 to 280° C. for 2 hours or more.Type: ApplicationFiled: December 15, 2009Publication date: November 17, 2011Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Isao Ota, Natsumi Tsuihiji
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Patent number: 7887714Abstract: There is provided an abrasive used for polishing a substrate which comprises silica as a main component, for example a rock crystal, a quartz glass for photomask, for CMP of an organic film, Inter Layer Dielectric (ILD) and shallow trench isolation of a semiconductor device, or for polishing a hard disk made of glass. A sol which particles are dispersed in a medium, wherein the particles have a particle size of 0.005 to 1 ?m and comprise as a main component crystalline cerium oxide of the cubic system and as an additional component a lanthanum compound, a neodymium compound or a combination thereof, wherein the additional component is contained in X/(Ce+X) molar ratio of 0.001 to 0.5 in which X is lanthanum atoms, neodymium atoms or a combination thereof.Type: GrantFiled: December 17, 2001Date of Patent: February 15, 2011Assignee: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Kenji Tanimoto, Tohru Nishimura
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Patent number: 7678703Abstract: A production method of a semiconductor device including: producing a polishing composition containing zirconium oxide sol; and planarizing a substrate having an uneven surface with said polishing composition, wherein the polishing composition containing zirconium oxide is produced by the steps comprising: baking at a temperature ranging from 400 to 1000° C.Type: GrantFiled: October 7, 2008Date of Patent: March 16, 2010Assignee: Nissan Chemical Industries, Ltd.Inventors: Noriyuki Takakura, Isao Ota, Kenji Tanimoto
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Patent number: 7578862Abstract: The present invention provides an abrasive compound suitable for polishing the surface of a glass substrate for an optical disk platter or a magnetic disk platter. More specifically, the present invention provides an abrasive compound for a glass hard disk platter, characterized as comprising a stable slurry having water and, dispersed therein as an abrasive, cerium(IV) oxide particles having an average secondary particle size of 0.1 to 0.5 ?m and containing CeO2 in a concentration of 0.2 to 30 wt %. Preferably, the present invention provides the above abrasive compound in which cerium amounts for 95% or more in terms of oxides of the total amount of rare earth elements in the abrasive.Type: GrantFiled: October 6, 2003Date of Patent: August 25, 2009Assignee: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Tohru Nishimura, Kenji Tanimoto
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Publication number: 20090042393Abstract: A production method of a semiconductor device including: producing a polishing composition containing zirconium oxide sol; and planarizing a substrate having an uneven surface with said polishing composition, wherein the polishing composition containing zirconium oxide is produced by the steps comprising: baking at a temperature ranging from 400 to 1000° C.Type: ApplicationFiled: October 7, 2008Publication date: February 12, 2009Applicant: Nissan Chemical Industries, Ltd.Inventors: Noriyuki Takakuma, Isao Ota, Kenji Tanimoto
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Patent number: 7484679Abstract: A method of milling cerium compound by means of a ball mill using a milling medium, characterized in that ratio Hb/r of radius r of a cylindrical ball mill container and depth Hb of the milling medium in the ball mill container disposed horizontally ranges from 1.2 to 1.9, and the ball mill container is rotated at a rotational speed which is 50% or less of critical rotational speed Nc=299/r1/2 of the ball mill container converted from the radius r expressed in centimeter. The milling method can be carried out in a wet or dry process, and the cerium compound is preferably cerium oxide. The method can be also applied for producing a cerium compound slurry.Type: GrantFiled: July 3, 2003Date of Patent: February 3, 2009Assignee: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Kenji Tanimoto, Gen Yamada, Noriyuki Takakuma
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Publication number: 20080254718Abstract: [Problems to Be Solved] To provide a method for obtaining a polishing composition by which a polishing speed is high and the polished surface has little surface failure. [Means to Solve the Problems] The present invention relates to a production method of a polishing composition containing zirconia oxide sol including: baking at a temperature ranging from 400 to 1000° C.Type: ApplicationFiled: May 10, 2006Publication date: October 16, 2008Inventors: Noriyuki Takakuma, Isao Ota, Kenji Tanimoto
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Patent number: 7431758Abstract: The production method for cerium oxide particles of the present invention is a method of producing a cerium oxide particle by heating a cerium compound from a normal temperature to a temperature range of 400° C. to 1200° C., and comprises at least a temperature raising stage of a temperature rise speed of 2° C./hour to 60° C./hour, or proceeds via a stage of heating while supplying a humidified gas in a temperature raising process. By the method of the present invention, a cerium oxide powder whose particle diameter distribution of primary particles is narrow can be obtained. An aqueous cerium oxide slurry produced from the powder enables an improvement in the productivity and a reduction in the cost of a polishing step, because if it is used as an abrasive a high-quality polished face is obtained without deteriorating the polishing speed. The aqueous cerium oxide slurry of the present invention is particularly useful as an abrasive for final finish of a substrate whose main component is silica.Type: GrantFiled: October 28, 2003Date of Patent: October 7, 2008Assignee: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Kenji Tanimoto, Noriyuki Takakuma
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Patent number: 7423380Abstract: Provided is a metal halide lamp capable of being dimmed, which is prevented from non-lighting due to leakage of an arc tube attributable to a crack occurring at thin tubes, as well as realizing a desired color characteristic. The metal halide lamp has an arc tube that includes an envelope made of translucent ceramic, a pair of electrodes, and metal halides, the metal halides including rare earth metal halide, sodium halide, and magnesium halide, the rare earth metal halide being at least one of dysprosium halide, thulium halide, holmium halide, cerium halide, and praseodymium halide, and the magnesium halide being at least one of magnesium iodide and magnesium bromide, where when a maximum lamp power P (W) is in a range of 70 W to 250 W, the following relations are satisfied: 0.0345A+0.0028B<0.0015 P+0.0475; A?0.021P+0.313; and B?10.0, where A (mg) represents a total content of the metal halides, and B (mol %) represents a content ratio of the magnesium halide to the metal halides.Type: GrantFiled: August 5, 2005Date of Patent: September 9, 2008Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Isao Ota, Kazuo Takeda, Kazushige Sakamoto
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Publication number: 20080156908Abstract: A method of milling cerium compound by means of a ball mill using a milling medium, characterized in that ratio Hb/r of radius r of a cylindrical ball mill container and depth Hb of the milling medium in the ball mill container disposed horizontally ranges from 1.2 to 1.9, and the ball mill container is rotated at a rotational speed which is 50% or less of critical rotational speed Nc=299/r1/2 of the ball mill container converted from the radius r expressed in centimeter. The milling method can be carried out in a wet or dry process, and the cerium compound is preferably cerium oxide. The method can be also applied for producing a cerium compound slurry.Type: ApplicationFiled: February 26, 2008Publication date: July 3, 2008Applicant: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Kenji Tanimoto, Gen Yamada, Noriyuki Takakuma
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Publication number: 20070240366Abstract: [Problems] To provide a polishing agent for use in polishing for planarization in semiconductor device production steps and for use in a semiconductor device isolation process. [Means for Solving Problems] The composition for polishing comprises a component (A), which is a water-soluble organic compound containing a carboxyl group or a salt thereof; and a component (B), which is an aqueous sol of cerium oxide particles obtained by calcining a cerium compound by holding it in at least two different calcining temperature ranges and wet-milling the resultant cerium oxide powder until the ratio of the mean particle size (b1) measured in the aqueous sol by the laser diffraction method to the particle size (b2) as determined from the specific surface area measured by the gas adsorption method is in the range of either 1 to 4 or 15 to 40. The component (A) is ammonium acrylate, ammonium methacrylate, an amino acid or a derivative thereof.Type: ApplicationFiled: May 16, 2005Publication date: October 18, 2007Applicant: NISSAN CHEMICAL INDUSTRIES, LTDInventors: Isao Ota, Kenji Tanimoto, Noriyuki Takakuma
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Patent number: 7230389Abstract: A metal halide lamp includes a ceramic arc tube that is composed of a main body and two narrow tube parts provided at respective ends of the main body; a pair of electrodes provided inside the main body; two feeders, each being connected at one end thereof to a different one of the electrodes inside the main body, and extending through a different one of the narrow tube parts, so as to be external to the arc tube at another end; a starting wire that is connected to one of the feeders, and that is in a vicinity of or contacts an outer surface of the arc tube; and a current suppressing unit that is on a current path of the starting wire, and suppresses or cuts off current on the path.Type: GrantFiled: September 12, 2003Date of Patent: June 12, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Kazuo Takeda, Isao Ota, Kazushige Sakamoto, Yoshiharu Nishiura
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Publication number: 20060150526Abstract: The production method for cerium oxide particles of the present invention is a method of producing a cerium oxide particle by heating a cerium compound from a normal temperature to a temperature range of 400° C. to 1200° C., and comprises at least a temperature raising stage of a temperature rise speed of 2° C./hour to 60° C./hour, or proceeds via a stage of heating while supplying a humidified gas in a temperature raising process. By the method of the present invention, a cerium oxide powder whose particle diameter distribution of primary particles is narrow can be obtained. An aqueous cerium oxide slurry produced from the powder enables an improvement in the productivity and a reduction in the cost of a polishing step, because if it is used as an abrasive a high-quality polished face is obtained without deteriorating the polishing speed. The aqueous cerium oxide slurry of the present invention is particularly useful as an abrasive for final finish of a substrate whose main component is silica.Type: ApplicationFiled: October 28, 2003Publication date: July 13, 2006Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Isao Ota, Kenji Tanimoto, Noriyuki Takakuma
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Publication number: 20060049765Abstract: Provided is a metal halide lamp capable of being dimmed, which is prevented from non-lighting due to leakage of an arc tube attributable to a crack occurring at thin tubes, as well as realizing a desired color characteristic. The metal halide lamp has an arc tube that includes an envelope made of translucent ceramic, a pair of electrodes, and metal halides, the metal halides including rare earth metal halide, sodium halide, and magnesium halide, the rare earth metal halide being at least one of dysprosium halide, thulium halide, holmium halide, cerium halide, and praseodymium halide, and the magnesium halide being at least one of magnesium iodide and magnesium bromide, where when a maximum lamp power P (W) is in a range of 70 W to 250 W, the following relations are satisfied: 0.0345A+0.0028B<0.0015P+0.0475; A?0.021P+0.313; and B?10.0, where A (mg) represents a total content of the metal halides, and B (mol %) represents a content ratio of the magnesium halide to the metal halides.Type: ApplicationFiled: August 5, 2005Publication date: March 9, 2006Inventors: Isao Ota, Kazuo Takeda, Kazushige Sakamoto
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Publication number: 20050253001Abstract: A method of milling cerium compound by means of a ball mill using a milling medium, characterized in that ratio Hb/r of radius r of a cylindrical ball mill container and depth Hb of the milling medium in the ball mill container disposed horizontally ranges from 1.2 to 1.9, and the ball mill container is rotated at a rotational speed which is 50% or less of critical rotational speed Nc=299/r1/2 of the ball mill container converted from the radius r expressed in centimeter. The milling method can be carried out in a wet or dry process, and the cerium compound is preferably cerium oxide. The method can be also applied for producing a cerium compound slurry.Type: ApplicationFiled: July 3, 2003Publication date: November 17, 2005Applicant: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Kenji Tanimoto, Gen Yamada, Noriyuki Takakuma
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Patent number: 6887289Abstract: There is provided an abrasive used for polishing a substrate which comprises silica as a main component, for example a rock crystal, a quartz glass for photomask, for CMP of an organic film, Inter Layer Dielectric (ILD) and shallow trench isolation of a semiconductor device, or for polishing a hard disk made of glass. A sol which particles are dispersed in a medium, wherein the particles have a particle size of 0.005 to 1 ?m and comprise as a main component crystalline cerium oxide of the cubic system and as an additional component a lanthanum compound, a neodymium compound or a combination thereof, wherein the additional component is contained in X/(Ce+X) molar ratio of 0.001 to 0.5 in which X is lanthanum atoms, neodymium atoms or a combination thereof.Type: GrantFiled: February 19, 2004Date of Patent: May 3, 2005Assignee: Nissan Chemical Industries, Ltd.Inventors: Isao Ota, Kenji Tanimoto, Tohru Nishimura
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Publication number: 20040223898Abstract: There is provided an abrasive used for polishing a substrate which comprises silica as a main component, for example a rock crystal, a quartz glass for photomask, for CMP of an organic film, Inter Layer Dielectric (ILD) and shallow trench isolation of a semiconductor device, or for polishing a hard disk made of glass.Type: ApplicationFiled: February 19, 2004Publication date: November 11, 2004Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.Inventors: Isao Ota, Kenji Tanimoto, Tohru Nishimura
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Publication number: 20040104680Abstract: A metal halide lamp includes a ceramic arc tube that is composed of a main body and two narrow tube parts provided at respective ends of the main body; a pair of electrodes provided inside the main body; two feeders, each being connected at one end thereof to a different one of the electrodes inside the main body, and extending through a different one of the narrow tube parts, so as to be external to the arc tube at another end; a starting wire that is connected to one of the feeders, and that is in a vicinity of or contacts an outer surface of the arc tube; and a current suppressing unit that is on a current path of the starting wire, and suppresses or cuts off current on the path.Type: ApplicationFiled: September 12, 2003Publication date: June 3, 2004Inventors: Kazuo Takeda, Isao Ota, Kazushige Sakamoto, Yoshiharu Nishiura