Patents by Inventor Toshihiko Ueyama
Toshihiko Ueyama 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: 11866346Abstract: A composite oxide powder including a composition formula (1), wherein the ratio ?/? of a surface area value ? (m2/g) calculated by a BET one-point method to a surface area value ? (m2/g) calculated from a formula (2) is greater than 1.0 and equal to or less than 1.5 and the surface area value ? is equal to or less than 20 m2/g. ABO3-? (1) (wherein A is one or more types of elements (La, Sr, Sm, Ca and Ba), B is one or more types of elements (Fe, Co, Ni and Mn) and 0??<1); and surface area value ? (m2/g)=specific surface area value ?-surface area value ?(2) (the specific surface area value ? (m2/g) is a value in a total pore size range measured by a mercury intrusion method. The specific surface area value ? (m2/g) is a value in a range of pore sizes that are larger than a 50% cumulative particle size.Type: GrantFiled: August 7, 2020Date of Patent: January 9, 2024Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Kazumasa Ikari, Shintaro Ogawa, Toshihiko Ueyama
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Publication number: 20230311249Abstract: There is provided a bonding paste capable of forming a uniform bonding layer by reducing occurrence of voids at edges even when a bonding area is large, and bonding method using the paste, and provides a metal paste for bonding containing at least metal nanoparticles (A) having a number average primary particle size of 10 to 100 nm, wherein a cumulative weight loss value (L100) when a temperature is raised from 40° C. to 100° C. is 75 or less, and a cumulative weight loss value (L150) when a temperature is raised from 40° C. to 150° C. is 90 or more, and a cumulative weight loss value (L200) when a temperature is raised from 40° C. to 200° C. is 98 or more, based on 100 cumulative weight loss value (L700) when the paste is heated from 40° C. to 700° C. at a heating rate of 3° C./min in a nitrogen atmosphere.Type: ApplicationFiled: September 30, 2020Publication date: October 5, 2023Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Keiichi ENDOH, Toshihiko UEYAMA
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Publication number: 20230216065Abstract: A perovskite-type composite oxide powder is a perovskite-type composite oxide powder represented by a general formula ABO3-? (where ? represents an amount of deficiency of oxygen and 0??<1), an element contained in an A site is La, elements contained in a B site are Co and Ni and a crystallite size determined by a Williamson-Hall method is equal to or greater than 20 nm and equal to or less than 100 nm. In this way, when the perovskite-type composite oxide powder is used as an air electrode material for a fuel cell, an air electrode in which the resistance thereof is low and the conductivity thereof is high can be obtained.Type: ApplicationFiled: July 11, 2020Publication date: July 6, 2023Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Shintaro OGAWA, Kazumasa IKARI, Toshihiko UEYAMA
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Publication number: 20230197972Abstract: A composite oxide powder including a composition formula (1), wherein the ratio ?/? of a surface area value ?(m2/g) calculated by a BET one-point method to a surface area value ?(m2/g) calculated from a formula (2) is greater than 1.0 and equal to or less than 1.5 and the surface area value ? is equal to or less than 20 m2/g. ABO3-? (1) (wherein A is one or more types of elements (La, Sr, Sm, Ca and Ba), B is one or more types of elements (Fe, Co, Ni and Mn) and 0??<1); and surface area value ?(m2/g)=specific surface area value ?- surface area value ?(2) (the specific surface area value ?(m2/g) is a value in a total pore size range measured by a mercury intrusion method.The specific surface area value ?(m2/g) is a value in a range of pore sizes that are larger than a 50% cumulative particle size.Type: ApplicationFiled: August 7, 2020Publication date: June 22, 2023Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Kazumasa IKARI, Shintaro OGAWA, Toshihiko UEYAMA
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Patent number: 11502294Abstract: A producing method of a solution that contains lithium, at least one of a niobium complex and a titanium complex, and ammonia, wherein an amount of the ammonia in the solution is 0.3 mass % or less. The solution is suitable for forming a coating layer capable of improving battery characteristics of an active material in a battery.Type: GrantFiled: April 4, 2022Date of Patent: November 15, 2022Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yoshiaki Aiki, Toshihiko Ueyama, Koji Tanoue
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Publication number: 20220231287Abstract: A producing method of a solution that contains lithium, at least one of a niobium complex and a titanium complex, and ammonia, wherein an amount of the ammonia in the solution is 0.3 mass % or less. The solution is suitable for forming a coating layer capable of improving battery characteristics of an active material in a battery.Type: ApplicationFiled: April 4, 2022Publication date: July 21, 2022Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yoshiaki AIKI, Toshihiko UEYAMA, Koji TANOUE
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Patent number: 11264155Abstract: An object of the present invention is to provide a magnetic powder having a narrow particle size distribution of epsilon-type iron oxide particles, and another object is to provide magnetic powder suitable for magnetic recording medium by improving particle size distribution, and provide epsilon-type iron oxide magnetic particles and related technologies in which a number average particle diameter of major diameters (D50) is 10 to 20 nm, a 90% cumulative particle diameter (D90) is 30 nm or less, and a geometric standard deviation (?g) of major diameters is 1.45 or less, which are obtained by TEM observation.Type: GrantFiled: September 29, 2017Date of Patent: March 1, 2022Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Kazuhiro Yamaga, Tetsuya Kawahito, Toshihiko Ueyama, Kenji Sakane
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Patent number: 11231414Abstract: To provide magnetic composite particles which can be separated from a sample solution in a short period of time using magnetism, and furthermore, have an excellent dispersion stability in the sample solution, which are magnetic composite particles in which an outer shell is formed on surfaces of core particles containing an inorganic oxide or a polymer, wherein the outer shell comprises magnetic nanoparticles and a silicon compound, the value of the volume average particle diameter (dTEM) of the magnetic composite particles measured by a transmission electron microscope is 30 nm or more to 210 nm or less, and the value of (dDLS)/(dTEM) which is the ratio of the value of the particle diameter (dDLS) of the particles measured by a dynamic light scattering method and the value of the volume average particle diameter (dTEM) is 2.0 or less.Type: GrantFiled: August 31, 2017Date of Patent: January 25, 2022Assignees: TOHOKU UNIVERSITY, DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Daisuke Nagao, Mikio Konno, Haruyuki Ishii, Kumiko Hayashi, Natsuki Kohama, Takayuki Yoshida, Toshihiko Ueyama
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Patent number: 11228030Abstract: There is provided a solution containing lithium and at least one of a niobium complex and a titanium complex, excellent in storage stability, and suitable for forming a coating layer capable of improving battery characteristics of an active material, and a related technique, which is the solution containing lithium, at least one of a niobium complex and a titanium complex, and ammonia, wherein an amount of the ammonia in the solution is 0.2 mass % or less.Type: GrantFiled: June 28, 2017Date of Patent: January 18, 2022Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yoshiaki Aiki, Toshihiko Ueyama, Koji Tanoue
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Patent number: 11114228Abstract: A magnetic compound having a small dielectric loss and an antenna constituted by the magnetic compound and an electronic device incorporating the antenna are provided by a metal magnetic powder which is well dispersed in a resin having small dielectric loss, and a magnetic powder composite including: a metal magnetic powder; and one or more elements selected from carboxylic acid or its anhydride, aromatic carboxylic acid ester, and a derivative thereof, having a property that real part ?? permeability is 1.45 or more, tan ?? is 0.1 or less, tan ?? is 0.05 or less at a measuring frequency of 2 GHz, when a magnetic powder composite is prepared by adding 5 parts by mass of one or more elements selected from the carboxylic acid or its anhydride, the aromatic carboxylic acid ester, and the derivative thereof to 100 parts by mass of the metal magnetic powder.Type: GrantFiled: June 1, 2016Date of Patent: September 7, 2021Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Toshihiko Ueyama, Masahiro Gotoh, Takayuki Yoshida, Takuyuki Baba
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Patent number: 11056257Abstract: An object is to provide a magnetic compound excellent in high frequency properties and excellent in mechanical strength, and its related items, using the polyarylene sulfide resin, and to provide a technique regarding the magnetic compound having a metal magnetic powder and a polyarylene sulfide resin, and satisfying both mechanical strength and high frequency properties.Type: GrantFiled: June 1, 2016Date of Patent: July 6, 2021Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Takayuki Yoshida, Masahiro Gotoh, Toshihiko Ueyama, Takuyuki Baba, Toru Suzuki, Koji Tanaka
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Publication number: 20210012936Abstract: There is provided a magnetic material that has an excellent electromagnetic wave absorption performance in a wide frequency range even under low temperature and high temperature environments and that ensures the absorption performance, and provided a magnetic material as a mixture of a magnetic material having positive slope of change in coercive force dependent on temperature, and a magnetic material having negative slope of change in coercive force dependent on temperature.Type: ApplicationFiled: February 14, 2019Publication date: January 14, 2021Applicants: The University of Tokyo, DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Shin-ichi OHKOSHI, Asuka NAMAI, Marie YOSHIKIYO, Masahiro GOTOH, Toshihiko UEYAMA, Takayuki YOSHIDA
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Publication number: 20190382607Abstract: A method for producing a silver nanowire ink, includes mixing urethane resin particles having an average particle diameter of 200 nm or less, containing a urethane resin having a degree of elongation of less than 500%, with a silver nanowire dispersion liquid. The urethane resin may have an average value of 100% modulus (100% Mo), for example, 6.0 MPa or more. The content of the urethane resin colloid or the urethane resin emulsion may be from 0.01 to 2.0 mass % based on the total amount of the silver nanowire ink. The content of silver is preferably from 0.01 to 2.0 mass % based on the total amount of the silver nanowire ink. The content of the viscosity modifier is preferably from 0.01 to 2.0 mass % based on the total amount of the silver nanowire ink. The nanowires have high industrial practicability and a conductive film has high transparency and high conductivity.Type: ApplicationFiled: March 7, 2018Publication date: December 19, 2019Inventors: Kimitaka SATO, Daisuke KODAMA, Minami KANASUGI, Toshihiko UEYAMA, Satoru KURITA
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Publication number: 20190271694Abstract: To provide magnetic composite particles which can be separated from a sample solution in a short period of time using magnetism, and furthermore, have an excellent dispersion stability in the sample solution, which are magnetic composite particles in which an outer shell is formed on surfaces of core particles containing an inorganic oxide or a polymer, wherein the outer shell comprises magnetic nanoparticles and a silicon compound, the value of the volume average particle diameter (dTEM) of the magnetic composite particles measured by a transmission electron microscope is 30 nm or more to 210 nm or less, and the value of (dDLS)/(dTEM) which is the ratio of the value of the particle diameter (dDLS) of the particles measured by a dynamic light scattering method and the value of the volume average particle diameter (dTEM) is 2.0 or less.Type: ApplicationFiled: August 31, 2017Publication date: September 5, 2019Applicants: TOHOKU UNIVERSITY, DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Daisuke NAGAO, Mikio KONNO, Haruyuki ISHII, Kumiko HAYASHI, Natsuki KOHAMA, Takayuki YOSHIDA, Toshihiko UEYAMA
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Publication number: 20190229333Abstract: There is provided a solution containing lithium and at least one of a niobium complex and a titanium complex, excellent in storage stability, and suitable for forming a coating layer capable of improving battery characteristics of an active material, and a related technique, which is the solution containing lithium, at least one of a niobium complex and a titanium complex, and ammonia, wherein an amount of the ammonia in the solution is 0.2 mass % or less.Type: ApplicationFiled: June 28, 2017Publication date: July 25, 2019Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yoshiaki AIKI, Toshihiko UEYAMA, Koji TANOUE
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Publication number: 20190228889Abstract: An object of the present invention is to provide a magnetic powder having a narrow particle size distribution of epsilon-type iron oxide particles, and another object is to provide magnetic powder suitable for magnetic recording medium by improving particle size distribution, and provide epsilon-type iron oxide magnetic particles and related technologies in which a number average particle diameter of major diameters (D50) is 10 to 20 nm, a 90% cumulative particle diameter (D90) is 30 nm or less, and a geometric standard deviation (?g) of major diameters is 1.45 or less, which are obtained by TEM observation.Type: ApplicationFiled: September 29, 2017Publication date: July 25, 2019Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Kazuhiro YAMAGA, Tetsuya KAWAHITO, Toshihiko UEYAMA, Kenji SAKANE
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Publication number: 20190097216Abstract: There is provided a solution containing lithium and at least one of a niobium complex and a titanium complex, suppresses corrosiveness, excellent in storage stability, and suitable for forming a coating layer capable of improving battery characteristics of an active material, and a related technique, which is the solution containing lithium, at least one of a niobium complex and a titanium complex, and ammonia, wherein an amount of the ammonia in the solution is 1 mass % or less.Type: ApplicationFiled: March 9, 2017Publication date: March 28, 2019Applicant: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Yoshiaki AIKI, Toshihiko UEYAMA, Koji TANOUE
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Patent number: 10233099Abstract: Disclosed herein is a radioactive cesium decontaminator, a method of producing a radioactive cesium decontaminator, and a method of removing radioactive cesium using the decontaminator. The radioactive cesium decontaminator is formed by agglomeration of primary particles. The primary particles have a magnetic particle as a core portion, a coating layer made of an organic material coating the magnetic particle, and a capturing compound made of ferrocyanide material formed on the coating layer. A cumulative diameter D50 of the decontaminator is in a range of from 2.0 ?m to 50 ?m, and a value of a cumulative diameter distribution (D90?D10)/D50 is less than 6. The decontaminator is made by adding a ferrocyanide aqueous solution and an aqueous solution containing at least one transition metal into a suspension liquid containing a precursor formed by magnetic particles coated with organic monomer or polymer while applying a strong shear force.Type: GrantFiled: September 10, 2013Date of Patent: March 19, 2019Assignees: THE JIKEI UNIVERSITY, DOWA HOLDINGS CO., LTD.Inventors: Yoshihisa Namiki, Toshihiko Ueyama, Takayuki Yoshida, Ryoei Watanabe
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Publication number: 20190035521Abstract: There is provided a magnetic substance containing substituted ?-iron oxide particles applicable as a magnetic toner of one-component development system, and a technique related thereto, which is the magnetic substance containing substituted ?-iron oxide particles in which a part of ?-iron oxide is substituted with a metal element other than iron, and satisfying at least one of the following conditions: (Condition 1) A molar extinction coefficient of a magnetic substance dispersion liquid at a wavelength of 450 nm is less than 770 dm3 mol?1 cm?1. (Condition 2) A molar extinction coefficient of the magnetic substance dispersion liquid at a wavelength of 500 nm is less than 430 dm3 mol?1 cm?1.Type: ApplicationFiled: January 19, 2017Publication date: January 31, 2019Applicants: THE UNIVERSITY OF TOKYO, DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Shin-ichi OHKOSHI, Hiroko TOKORO, Kenji MASADA, Toshihiko UEYAMA
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Patent number: 10090275Abstract: A method of bonding two different substances includes the steps of: applying a bonding material containing a flux component that includes an organic material having at least two carboxyl groups to a bonding surface of a bonding object, disposing an object to be bonded on the bonding material, performing preliminary firing at a preset temperature in a state in which the object to be bonded is disposed, and performing a main firing by heating at a temperature higher than the temperature of the preliminary firing.Type: GrantFiled: December 11, 2015Date of Patent: October 2, 2018Assignee: DOWA ELECTRONICS MATERIALS CO., LTD.Inventors: Keiichi Endoh, Yutaka Hisaeda, Akihiro Miyazawa, Aiko Hirata, Toshihiko Ueyama