Patents by Inventor Takeshi Mitsuoka

Takeshi Mitsuoka 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).

  • Patent number: 9247585
    Abstract: A ceramic heater element 10 includes an insulating substrate 101, and a heating resistor 102 embedded in the insulating substrate 101. The insulating substrate 101 contains a main phase formed of ?-SiAlON or a multiphase SiAlON of ?-SiAlON and ?-SiAlON; a grain boundary phase containing a rare earth element; and a silicide of at least one species selected from among Cr, W, Mo, V, and Fe. The heating resistor 102 contains a main phase formed of an electrically conductive compound containing at least one species selected from among silicide, nitride, and carbide of Mo, and silicide, nitride, and carbide of W; ?-SiAlON or a multiphase SiAlON of ?-SiAlON and ?-SiAlON; and a grain boundary phase containing a rare earth element.
    Type: Grant
    Filed: November 29, 2011
    Date of Patent: January 26, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Yutaka Sekiguchi, Yoshihito Ikai, Takeshi Mitsuoka
  • Patent number: 9234870
    Abstract: A gas sensor element (100) including a detection portion (150) including a solid electrolyte body (105) and a pair of electrodes (104) and (106) disposed on the solid electrolyte body; and a porous protection layer (20) covering the detection portion. The porous protection layer includes an inner porous layer (21) and an outer porous layer (23); the inner porous layer is higher in porosity than the outer porous layer; the inner porous layer contains, as main components, ceramic particles (21a), and ceramic fiber filaments (21b) which are mainly formed of a ceramic material and which have a mean fiber length of 70 to 200 ?m; and the amount of the ceramic fiber filaments is 25 to 75 vol % on the basis of the total amount of the ceramic particles and the ceramic fiber filaments, the total amount being taken as 100 vol %.
    Type: Grant
    Filed: November 20, 2012
    Date of Patent: January 12, 2016
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Shigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Patent number: 9160145
    Abstract: An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met: 0.40?Y/X?2.00 0.10?Z/X?0.40.
    Type: Grant
    Filed: May 8, 2014
    Date of Patent: October 13, 2015
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Katsuya Takaoka, Yutaka Yokoyama, Kengo Fujimura, Hironori Uegaki, Hiroki Takeuchi, Hirokazu Kurono, Toshitaka Honda, Kuniharu Tanaka, Takeshi Mitsuoka
  • Publication number: 20150207300
    Abstract: A spark plug including an insulator containing an Al component, in terms of oxides, 89 mass % or more and a Ti component, in terms of oxides, more than 0 mass % and 0.2 mass % or less, characterized in that the insulator is formed of an alumina-based sintered material which contains, in a grain boundary phase present between alumina crystal grains, a first crystal phase containing at least one species selected from among an La component, an Nd component, a Pr component, a Y component, an Er component, a Yb component, and an Lu component, and a second crystal phase containing at least one species of Group 2 element components, an Al component and an Si component.
    Type: Application
    Filed: August 23, 2013
    Publication date: July 23, 2015
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Hiroki Takeuchi, Yutaka Yokoyama, Kuniharu Tanaka, Takeshi Mitsuoka, Toshitaka Honda, Hirokazu Kurono, Katsuya Takaoka, Hironori Uegaki
  • Patent number: 9080964
    Abstract: A gas sensor element (100) includes a laminate of a detection element (300) and a heater (200), and a porous protection layer (20) covering a forward end portion thereof. The laminate has a measuring chamber (107c) into which a gas-to-be-measured is introduced via a diffusion resistor (115). The porous protection layer includes an inner porous layer (21), and an outer porous layer (23). The inner porous layer has a higher porosity than the outer porous layer and the diffusion resistor. As viewed in a plurality of 100 ?m×100 ?m regions a1 to a3 and b1 to b3 on sections of the inner porous layer and the diffusion resistor, respectively, a pore diameter greater than the greatest pore diameter CDIF in the regions of the diffusion resistor exists in each of the regions of the inner porous layer.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: July 14, 2015
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Sigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Patent number: 8992752
    Abstract: There is provided a gas sensor element for detecting the concentration of a specific gas component in gas under measurement, which includes a plate-shaped element body and a porous protection layer. The element body has, at one end portion thereof, a gas sensing portion formed with a solid electrolyte substrate and a pair of electrodes. The porous protection layer has a porous structure formed of ceramic particles and surrounds at least the circumference of the one end portion of the element body. In the present invention, the porous protection layer has an inner region, an intermediate region and an outer region laminated together in order of mention from the element body toward the outside. The intermediate region has a porosity lower than those of the inner and outer regions. There is also provided a gas sensor with such a gas sensor element.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: March 31, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Masaki Onkawa, Shigehiro Otsuka, Seiji Oya, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Patent number: 8927447
    Abstract: A ceramic sintered body includes tungsten carbide, zirconia, and alumina. The content of the tungsten carbide is 20 to 50 vol %, and the content of the zirconia is 5 to 25 vol %. The crystal phase of the zirconia is a tetragonal crystal or a mixture of tetragonal and monoclinic crystals. The ceramic sintered body does not substantially include Ti compounds. The average particle diameter of the tungsten carbide, the average particle diameter of the zirconia, and the average particle diameter of the alumina are all 1 ?m or less.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: January 6, 2015
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Jun Moteki, Yusuke Katsu, Takeshi Mitsuoka
  • Patent number: 8889577
    Abstract: A sintered body containing alumina crystal particles and zirconia crystal particles as main components includes the tetragonal crystal particles as the zirconia crystal particles. The zirconia crystal particles satisfy relations 0%?A?3%, 3%?B?22% and 77%?C?96%,where A, B and C are as defined herein.
    Type: Grant
    Filed: July 6, 2012
    Date of Patent: November 18, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Jun Moteki, Yusuke Katsu, Kuniharu Tanaka, Takeshi Mitsuoka, Yoshihiro Kuroki, Hironobu Kusanagi
  • Publication number: 20140336035
    Abstract: An insulator for spark plug with a main constituent of alumina and containing silicon includes a grain boundary phase positioned between alumina particles. The grain boundary phase contains: a group 2A element; a rare earth element; and at least one kind of zirconium, titanium, chrome, niobium, manganese, and iron (a first element). Assuming that a total amount of the rare earth element is X (mass %), a total amount of the group 2A element is Y (mass %), and a total amount of the first element is Z (mass %), the following are met: 0.40?Y/X?2.00 0.10?Z/X?0.40.
    Type: Application
    Filed: May 8, 2014
    Publication date: November 13, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Katsuya TAKAOKA, Yutaka YOKOYAMA, Kengo FUJIMURA, Hironori UEGAKI, Hiroki TAKEUCHI, Hirokazu KURONO, Toshitaka HONDA, Kuniharu TANAKA, Takeshi MITSUOKA
  • Publication number: 20140291150
    Abstract: A gas sensor element (100) including a detection portion (150) including a solid electrolyte body (105) and a pair of electrodes (104) and (106) disposed on the solid electrolyte body; and a porous protection layer (20) covering the detection portion. The porous protection layer includes an inner porous layer (21) and an outer porous layer (23); the inner porous layer is higher in porosity than the outer porous layer; the inner porous layer contains, as main components, ceramic particles (21a), and ceramic fiber filaments (21b) which are mainly formed of a ceramic material and which have a mean fiber length of 70 to 200 ?m; and the amount of the ceramic fiber filaments is 25 to 75 vol % on the basis of the total amount of the ceramic particles and the ceramic fiber filaments, the total amount being taken as 100 vol %.
    Type: Application
    Filed: November 20, 2012
    Publication date: October 2, 2014
    Applicant: NGK SPARK PLUG CO. LTD.
    Inventors: Shigehiro Otsuka, Masaki Onkawa, Toru Iwano, Satoshi Teramoto, Kuniharu Tanaka, Takeshi Mitsuoka
  • Publication number: 20140242383
    Abstract: A ceramic sintered body includes tungsten carbide, zirconia, and alumina. The content of the tungsten carbide is 20 to 50 vol %, and the content of the zirconia is 5 to 25 vol %. The crystal phase of the zirconia is a tetragonal crystal or a mixture of tetragonal and monoclinic crystals. The ceramic sintered body does not substantially include Ti compounds. The average particle diameter of the tungsten carbide, the average particle diameter of the zirconia, and the average particle diameter of the alumina are all 1 ?m or less.
    Type: Application
    Filed: June 10, 2013
    Publication date: August 28, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Jun Moteki, Yusuke Katsu, Takeshi Mitsuoka
  • Patent number: 8771559
    Abstract: A conductive sintered oxide which includes: a conductive crystal phase having a perovskite structure represented by (RE1-cSrc)MdO3, in which RE is a group of elements consisting of Yb and/or Lu and at least one element selected from Group IIIA elements excluding Yb, Lu and La, and M is a group of elements consisting of Al and at least one element selected from Groups IVA, VA, VIA, VIIA and VIII, a first insulating crystal phase represented by RE2O3, and a second insulating crystal phase represented by SrAl2O4. The conductive crystal phase has a coefficient c satisfying 0.18<c<0.50 and has a coefficient d satisfying 0.67?d?0.93. A content of a third insulating crystal phase represented by RE4Al2O9, the content of which may be zero, is smaller than the content of each of the first and second insulating crystal phases.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: July 8, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroshi Watanabe, Yasuyuki Okimura, Shinji Ban, Takeshi Mitsuoka
  • Patent number: 8754728
    Abstract: A relay includes: a pair of fixed terminals, each being arranged to have a fixed contact on a one-end face; a movable contact member arranged to have a pair of movable contacts that are correspondingly opposed to the respective fixed contacts; and a driving structure operated to move the movable contact member. In a moving direction of the movable contact member, a side where the fixed contacts are located is called a first side, and a side where the movable contacts are located is called a second side. The movable contact member includes: a center section located between the pair of movable contacts and located on the second side relative to the movable contacts; and a pair of extended sections located between the center section and the pair of movable contacts and extended in a direction including a component of the moving direction.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: June 17, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shinsuke Ito, Youichi Hattori, Norihiko Nadanami, Ryuji Inoue, Takeshi Mitsuoka, Takio Kojima, Taku Hirano
  • Publication number: 20140130572
    Abstract: A gas sensor element and a gas sensor incorporating the gas sensor element. The gas sensor element (100) includes a detection portion (150) including a solid electrolyte body (105) and a pair of electrodes (104) and (106) disposed on the solid electrolyte body; and a porous protection layer (20) covering the detection portion. The porous protection layer includes an inner porous layer (21) and an outer porous layer (23). The inner porous layer has a higher porosity than the outer porous layer. Further, the inner porous layer contains, as main components, ceramic particles (21a), and ceramic fiber filaments (21b), and the amount of the ceramic fiber filaments is 25 to 75 vol % based on the total amount of the ceramic particles and the ceramic fiber filaments taken as 100 vol %.
    Type: Application
    Filed: May 31, 2013
    Publication date: May 15, 2014
    Inventors: Shigehiro OTSUKA, Masaki ONKAWA, Toru IWANO, Satoshi TERAMOTO, Kuniharu TANAKA, Takeshi MITSUOKA
  • Patent number: 8674796
    Abstract: A relay includes: a plurality of fixed terminals arranged to have fixed contacts; and a movable contact member arranged to have a plurality of movable contacts that are correspondingly opposed to the respective fixed contacts. The relay further includes: a driving structure operated to move the movable contact member such that the respective movable contacts come into contact with the corresponding fixed contacts; a plurality of first vessels provided corresponding to the respective fixed terminals and arranged to have insulating property; a second vessel joined with the plurality of first vessels; and an air-tight space formed by the plurality of fixed terminals, the plurality of first vessels and the second vessel to allow the movable contact member and the respective fixed contacts to be placed therein.
    Type: Grant
    Filed: October 31, 2011
    Date of Patent: March 18, 2014
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Shinsuke Ito, Youichi Hattori, Norihiko Nadanami, Ryuji Inoue, Takeshi Mitsuoka, Takio Kojima
  • Patent number: 8617432
    Abstract: A sintered electroconductive oxide forming a thermistor element has a first crystal phase having a composition represented by RE14Al2O9 and a second crystal phase having a perovskite structure represented by (RE21-aSLa)MO3. The factor a of the second crystal phase is: 0.18<a<0.50, wherein RE1 represents at least one of Yb and Lu and at least one species selected from among group 3A elements excluding Yb, Lu, and La; RE2 represents at least one species selected from among group 3A elements excluding La and which contains at least one species selected from the group RE1; M represents Al and at least one species selected from group 4A to 7A, and 8 elements; and SL represents Sr, Ca, and Mg, with at least Sr being included at a predominant proportion by mole.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: December 31, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Yasuyuki Okimura, Shinji Ban, Hiroshi Watanbe, Takeshi Mitsuoka
  • Patent number: 8617433
    Abstract: A conductive sintered oxide including: a first crystal phase represented by RE14Al2O9 and a second crystal phase having a perovskite structure represented by (RE21-cSLc)(AlxM1y)O3. RE1 is a first element group consisting of Yb and/or Lu and at least one element selected from Group IIIA elements excluding Yb, Lu and La. RE2 is a second element group consisting of at least one element selected from Group IIIA elements excluding La and including at least one of the elements constituting the first element group RE1. SL is an element group consisting of at least one of Sr, Ca and Mg and which includes Sr as a main element, and M1 is an element group consisting of at least one element selected from Groups IVA, VA, VIA, VIIA and VIII excluding Cr. The coefficient c is in the range of 0.18<c<0.50, and the coefficients x and y are in the range of 0.95?x+y?1.1.
    Type: Grant
    Filed: August 16, 2011
    Date of Patent: December 31, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hiroshi Watanabe, Yasayuki Okimura, Shinji Ban, Takeshi Mitsuoka
  • Patent number: 8564184
    Abstract: A spark plug that is equipped with an insulator that has a stem portion on a front end side, a center electrode, and a main metal member that retains the insulator at an engaging projection portion, wherein an inner diameter DIN of the engaging projection portion, the maximum outer diameter dOUT of the stem portion, which faces an inner circumferential surface of the engaging projection portion, its inner diameter dIN, and dielectric constant ? of the insulator satisfy the condition of “(DIN?dOUT)/2?0.40 (mm)”, “(dOUT?dIN)/2?1.65 (mm)”, and “??9.4”.
    Type: Grant
    Filed: June 23, 2010
    Date of Patent: October 22, 2013
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hirokazu Kurono, Toshitaka Honda, Katsuya Takaoka, Hiroki Takeuchi, Kuniharu Tanaka, Takeshi Mitsuoka
  • Publication number: 20130236259
    Abstract: A sintered body containing alumina crystal particles and zirconia crystal particles as main components includes the tetragonal crystal particles as the zirconia crystal particles. The zirconia crystal particles satisfy relations 0%?A?3%, 3%?B?22% and 77%?C?96%, where A, B and C are as defined herein.
    Type: Application
    Filed: July 6, 2012
    Publication date: September 12, 2013
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Jun Moteki, Yusuke Katsu, Kuniharu Tanaka, Takeshi Mitsuoka, Yoshihiro Kuroki, Hironobu Kusanagi
  • Publication number: 20130213954
    Abstract: A ceramic heater element 10 includes an insulating substrate 101, and a heating resistor 102 embedded in the insulating substrate 101. The insulating substrate 101 contains a main phase formed of ?-SiAlON or a multiphase SiAlON of ?-SiAlON and ?-SiAlON; a grain boundary phase containing a rare earth element; and a silicide of at least one species selected from among Cr, W, Mo, V, and Fe. The heating resistor 102 contains a main phase formed of an electrically conductive compound containing at least one species selected from among silicide, nitride, and carbide of Mo, and silicide, nitride, and carbide of W; ?-SiAlON or a multiphase SiAlON of ?-SiAlON and ?-SiAlON; and a grain boundary phase containing a rare earth element.
    Type: Application
    Filed: November 29, 2011
    Publication date: August 22, 2013
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Yutaka Sekiguchi, Yoshihito Ikai, Takeshi Mitsuoka