Patents by Inventor Keisuke Ohtsuka

Keisuke Ohtsuka 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).

  • Publication number: 20210164698
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. The motor rotation rate of a compressor (100) can be changed in accordance with an air conditioning load, and thus a high annual performance factor (APF) can be achieved. In addition, an electrolytic capacitor is not required on an output side of a rectifier circuit (21), and thus an increase in the size and cost of the circuit is suppressed.
    Type: Application
    Filed: December 18, 2018
    Publication date: June 3, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Publication number: 20210164701
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (1), a compressor (100, 200) can be driven without interposing a power conversion device between an AC power source (90, 190) and a motor (70, 170). Thus, it is possible to provide the air conditioner (1) that is environmentally friendly and has a relatively inexpensive configuration.
    Type: Application
    Filed: December 18, 2018
    Publication date: June 3, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Patent number: 10982610
    Abstract: A controller for an engine estimates a temperature of the exhaust gas and controls the engine according to the estimated exhaust temperature. The controller changes the air-fuel ratio to a stoichiometric air-fuel ratio or leaner. The controller calculates the progress of combustion on the basis of signals of sensors, and estimates an exhaust temperature. In the case where the air-fuel ratio is the stoichiometric air-fuel ratio, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a first relationship that is at least defined between the progress of the combustion and the exhaust temperature, . In the case where the air-fuel ratio is lean, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a second relationship that differs from the first relationship.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: April 20, 2021
    Assignee: Mazda Motor Corporation
    Inventors: Keisuke Ohtsuka, Kentaro Kimura, Takeatsu Ito, Tomokuni Kusunoki
  • Publication number: 20200392387
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. The motor rotation rate of a compressor (100) can be changed in accordance with an air conditioning load, and thus a high annual performance factor (APF) can be achieved. In addition, an electrolytic capacitor is not required on an output side of a rectifier circuit (21), and thus an increase in the size and cost of the circuit is suppressed.
    Type: Application
    Filed: June 26, 2020
    Publication date: December 17, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke OHTSUKA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Yuzo KOMATSU, Shun OHKUBO, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Publication number: 20200363112
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (1), a compressor (100, 200) can be driven without interposing a power conversion device between an AC power source (90, 190) and a motor (70, 170). Thus, it is possible to provide the air conditioner (1) that is environmentally friendly and has a relatively inexpensive configuration.
    Type: Application
    Filed: June 26, 2020
    Publication date: November 19, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke Ohtsuka, Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Yuzo Kamatsu, Shun Ohkubo, Tatsuya Takakuwa, Tetsushi Tsuda
  • Publication number: 20200355136
    Abstract: A controller for an engine estimates a temperature of the exhaust gas and controls the engine according to the estimated exhaust temperature. The controller changes the air-fuel ratio to a stoichiometric air-fuel ratio or leaner. The controller calculates the progress of combustion on the basis of signals of sensors, and estimates an exhaust temperature. In the case where the air-fuel ratio is the stoichiometric air-fuel ratio, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a first relationship that is at least defined between the progress of the combustion and the exhaust temperature, . In the case where the air-fuel ratio is lean, the controller estimates the exhaust temperature on the basis of the progress of the combustion, the engine temperature, and a second relationship that differs from the first relationship.
    Type: Application
    Filed: March 6, 2020
    Publication date: November 12, 2020
    Inventors: Keisuke Ohtsuka, Kentaro Kimura, Takeatsu Ito, Tomokuni Kusunoki
  • Publication number: 20200332166
    Abstract: A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains at least 1,2-difluoroethylene.
    Type: Application
    Filed: December 18, 2018
    Publication date: October 22, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Takuro YAMADA, Atsushi YOSHIMI, Ikuhiro IWATA, Mitsushi ITANO, Daisuke KARUBE, Yuuki YOTSUMOTO, Kazuhiro TAKAHASHI, Tatsuya TAKAKUWA, Yuzo KOMATSU, Shun OHKUBO, Keisuke OHTSUKA, Yoshinari ASANO, Keiji AOTA, Yuuichi YANAGI, Yoshikazu NAKAO, Takeo ABE, Yumi TODA, Tetsushi TSUDA
  • Patent number: 8455564
    Abstract: A dental composition of the present invention includes: a polymerizable monomer component (A); and an amorphous filler (B) having an average particle size of 1 to 20 ?m and including silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. The dental composition contains 20 to 500 parts by weight of the filler (B) per 100 parts by weight of the polymerizable monomer component (A). The dental composition has a viscosity of 10 to 800 Pa·s. It is preferable that the filler (B) contain spherical particles, and that the percentage of the spherical particles in the filler (B) be at least 60%.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: June 4, 2013
    Assignees: Kuraray Noritake Dental Inc., JGC Catalysts and Chemicals Ltd.
    Inventors: Yoshiko Kuboe, Masaki Okubayashi, Koichi Okada, Keisuke Ohtsuka
  • Patent number: 8440739
    Abstract: A dental composition of the present invention includes: a polymerizable monomer (A); an amorphous filler (B) having an average particle size of 1 to 20 ?m and including silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles; and inorganic particles (C) having an average particle size of 0.1 to 1.0 ?m. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. It is preferable that the dental composition contain 50 to 400 parts by weight of the filler (B) and 100 to 400 parts by weight of the inorganic particles (C) per 100 parts by weight of the polymerizable monomer (A).
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: May 14, 2013
    Assignees: Kuraray Noritake Dental Inc., JGC Catalysts and Chemicals Ltd.
    Inventors: Masaki Okubayashi, Koichi Okada, Yusuke Takahata, Keisuke Ohtsuka
  • Patent number: 8436078
    Abstract: The present invention provides a dental composition exhibiting both an excellent light diffusion property and excellent transparency, and having high mechanical strength and surface smoothness and gloss after polishing as a cured product and good handling properties as a paste. The present invention is a dental composition including: a polymerizable monomer (A); and an amorphous powder (B). The amorphous powder (B) has an average particle size of 1 to 20 ?m, and includes silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. The difference in refractive index between the cured product of the polymerizable monomer (A) and the amorphous powder (B) is 0.005 to 0.03.
    Type: Grant
    Filed: April 28, 2009
    Date of Patent: May 7, 2013
    Assignees: Kuraray Noritake Dental Inc., JGC Catalysts and Chemicals Ltd.
    Inventors: Masaki Okubayashi, Koichi Okada, Yusuke Takahata, Keisuke Ohtsuka
  • Patent number: 8247298
    Abstract: Disclosed is a method of manufacturing a semiconductor device comprising: forming a first layer on a sidewall of a trench formed on a main surface of a semiconductor substrate, filling up the trench with a protective film, etching back the protective film by a dry etching method so that a height of a surface of the protective film is lower than an opening of the trench and removing the first layer exposed by the etching-back.
    Type: Grant
    Filed: September 16, 2010
    Date of Patent: August 21, 2012
    Assignee: Elpida Memory, Inc.
    Inventor: Keisuke Ohtsuka
  • Patent number: 8182860
    Abstract: The present invention provides dental fillers having the optical and/or mechanical characteristics required to dental materials, a method of producing the same, and a dental composite material prepared with use of the dental filler. More specifically, the present invention provides a dental filler containing a zirconium silicate compound, especially a zirconium trisilicate compound with a wadeite type crystalline structure and having an average particle diameter in the range from 2 to 50,000 nm, a method of producing the same, a dental composite material containing the dental filler and a hardenable resin selected from an acrylic resin, a methacrylic resin, an epoxy resin, a vinyl resin, a urethane resin and the like.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: May 22, 2012
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Keisuke Ohtsuka, Yoshifumi Miyano, Hirokazu Tanaka, Eiko Tanaka, legal representative
  • Patent number: 8133779
    Abstract: A conductive film is formed to extend from a bottom and a sidewall of a recess formed in an interlayer insulating film onto a top surface of the interlayer insulating film. Dry etching of the conductive film is performed such that a portion of the conductive film remains on the bottom and sidewall of the recess. The dry etching is also performed such that a deposition film is formed on a top portion of the recess.
    Type: Grant
    Filed: October 12, 2009
    Date of Patent: March 13, 2012
    Assignee: Elpida Memory, Inc.
    Inventor: Keisuke Ohtsuka
  • Publication number: 20110304950
    Abstract: An electric double layer capacitor includes a pair of collectors, a separator, a conductive coating film, a polarizable electrode, and an electrolyte solution. The separator is arranged between the collectors. The conductive coating film covers a surface of at least one of the collectors facing the separator. The polarizable electrode is formed as to be in contact with at least a surface of the conductive coating film facing the separator. Preferably, electrolyte solution has a fluorine-containing organic solvent, and is impregnated into the polarizable electrode. Preferably, the capacitor enables an operating voltage of 3.5 V or higher.
    Type: Application
    Filed: February 25, 2010
    Publication date: December 15, 2011
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Keisuke Ohtsuka, Kenzou Takahashi, Mai Koyama
  • Patent number: 7981513
    Abstract: A dental filler having the optical and/or mechanical properties satisfying the requirements to a dental material, a method for producing the dental filler, and a dental composite material containing the dental filler. The dental filler comprises microparticles of amorphous inorganic oxide constituted by at least silica-based fine particles covered with a composite oxide comprising zirconium, silicon and oxygen. The dental composite material contains the dental filler and a hardenable resin selected from an acrylic resin, a methacrylic resin, an epoxy resin, a vinyl resin and a urethane resin.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: July 19, 2011
    Assignee: JGC Catalysts and Chemicals Ltd.
    Inventors: Keisuke Ohtsuka, Hirokazu Tanaka, Eiko Tanaka, legal representative
  • Publication number: 20110070720
    Abstract: Disclosed is a method of manufacturing a semiconductor device comprising: forming a first layer on a sidewall of a trench formed on a main surface of a semiconductor substrate, filling up the trench with a protective film, etching back the protective film by a dry etching method so that a height of a surface of the protective film is lower than an opening of the trench and removing the first layer exposed by the etching-back.
    Type: Application
    Filed: September 16, 2010
    Publication date: March 24, 2011
    Inventor: Keisuke OHTSUKA
  • Publication number: 20110065828
    Abstract: A dental composition of the present invention includes: a polymerizable monomer (A); an amorphous filler (B) having an average particle size of 1 to 20 ?m and including silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles; and inorganic particles (C) having an average particle size of 0.1 to 1.0 ?m. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. It is preferable that the dental composition contain 50 to 400 parts by weight of the filler (B) and 100 to 400 parts by weight of the inorganic particles (C) per 100 parts by weight of the polymerizable monomer (A).
    Type: Application
    Filed: April 28, 2009
    Publication date: March 17, 2011
    Applicants: Kuraray Medical Inc., JGC Catalysts and Chemicals LTD.
    Inventors: Masaki Okubayashi, Koichi Okada, Yusuke Takahata, Keisuke Ohtsuka
  • Publication number: 20110046261
    Abstract: A dental composition of the present invention includes: a polymerizable monomer component (A); and an amorphous filler (B) having an average particle size of 1 to 20 ?m and including silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. The dental composition contains 20 to 500 parts by weight of the filler (B) per 100 parts by weight of the polymerizable monomer component (A). The dental composition has a viscosity of 10 to 800 Pa·s. It is preferable that the filler (B) contain spherical particles, and that the percentage of the spherical particles in the filler (B) be at least 60%.
    Type: Application
    Filed: April 28, 2009
    Publication date: February 24, 2011
    Applicants: Kuraray Medical Inc., JGC Catalysts and Chemicals LTD.
    Inventors: Yoshiko Kuboe, Masaki Okubayashi, Koichi Okada, Keisuke Ohtsuka
  • Publication number: 20110046260
    Abstract: The present invention provides a dental composition exhibiting both an excellent light diffusion property and excellent transparency, and having high mechanical strength and surface smoothness and gloss after polishing as a cured product and good handling properties as a paste. The present invention is a dental composition including: a polymerizable monomer (A); and an amorphous powder (B). The amorphous powder (B) has an average particle size of 1 to 20 ?m, and includes silica-based fine particles and coatings of an oxide that cover the surfaces of the silica-based fine particles. The oxide contains a zirconium atom, a silicon atom, and an oxygen atom. The difference in refractive index between the cured product of the polymerizable monomer (A) and the amorphous powder (B) is 0.005 to 0.03.
    Type: Application
    Filed: April 28, 2009
    Publication date: February 24, 2011
    Applicants: Kuraray Medical Inc., JGC Catalysts and Chemicals Ltd
    Inventors: Masaki Okubayashi, Koichi Okada, Yusuke Takahata, Keisuke Ohtsuka
  • Publication number: 20100093149
    Abstract: A conductive film is formed to extend from a bottom and a sidewall of a recess formed in an interlayer insulating film onto a top surface of the interlayer insulating film. Dry etching of the conductive film is performed such that a portion of the conductive film remains on the bottom and sidewall of the recess. The dry etching is also performed such that a deposition film is formed on a top portion of the recess.
    Type: Application
    Filed: October 12, 2009
    Publication date: April 15, 2010
    Applicant: Elpida Memory, Inc.
    Inventor: Keisuke Ohtsuka