Patents by Inventor Kengo Fujimura

Kengo Fujimura 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: 11005237
    Abstract: An ignition plug comprising: an insulator having a through hole extending from a rear-end side toward a forward-end side; a center electrode inserted at least partially into a portion of the through hole on the forward-end side; a metal terminal member inserted at least partially into a portion of the through hole on the rear-end side; and a seal disposed within the through hole and in contact with the center electrode and an inner circumferential surface of the insulator. The seal contains a glass and an electrically conductive substance, and the glass contained in the seal contains Si in an amount of 50 mass % or more as reduced to SiO2 and Na in an amount of 0.1 mass % or more and less than 1 mass % as reduced to Na2O.
    Type: Grant
    Filed: June 16, 2020
    Date of Patent: May 11, 2021
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Seiji Nakano, Kengo Fujimura, Shoma Tsumagari
  • Publication number: 20200403386
    Abstract: An ignition plug comprising: an insulator having a through hole extending from a rear-end side toward a forward-end side; a center electrode inserted at least partially into a portion of the through hole on the forward-end side; a metal terminal member inserted at least partially into a portion of the through hole on the rear-end side; and a seal disposed within the through hole and in contact with the center electrode and an inner circumferential surface of the insulator. The seal contains a glass and an electrically conductive substance, and the glass contained in the seal contains Si in an amount of 50 mass % or more as reduced to SiO2 and Na in an amount of 0.1 mass % or more and less than 1 mass % as reduced to Na2O.
    Type: Application
    Filed: June 16, 2020
    Publication date: December 24, 2020
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Seiji NAKANO, Kengo FUJIMURA, Shoma TSUMAGARI
  • Publication number: 20200232977
    Abstract: The present invention is directed to a method for avoiding the influence of a blood sample on a measurement error in a latex agglutination immunoassay. The measurement error caused by a blood sample in a latex agglutination immunoassay can be reduced by a method which includes a step of bringing the sample into contact, in a liquid phase, with latex particles carrying a substance having a specific affinity for an analyte in the presence of imidazole.
    Type: Application
    Filed: September 29, 2017
    Publication date: July 23, 2020
    Applicant: SEKISUI MEDICAL CO., LTD.
    Inventors: Kengo FUJIMURA, Junichi KONDOU, Mitsuaki YAMAMOTO
  • Patent number: 10601202
    Abstract: A spark plug enabling suppression of reduction in the strength of an insulator. In the spark plug, a rear end portion of an engagement portion formed on an outer peripheral surface of a tubular insulator extending along an axial line from a front side to a rear side, is engaged with a to-be-engaged portion of a tubular metal shell disposed on the outer peripheral surface of the insulator. The insulator is made from ceramic such as alumina. On at least a part of the outer peripheral surface of the insulator, a projected and recessed portion is formed on the front side relative to the engagement portion so as to helically extend in a circumferential direction of the insulator.
    Type: Grant
    Filed: September 5, 2017
    Date of Patent: March 24, 2020
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Kengo Fujimura, Kimihiro Nishizono, Hiroki Ota
  • Publication number: 20190326733
    Abstract: A spark plug enabling suppression of reduction in the strength of an insulator. In the spark plug, a rear end portion of an engagement portion formed on an outer peripheral surface of a tubular insulator extending along an axial line from a front side to a rear side, is engaged with a to-be-engaged portion of a tubular metal shell disposed on the outer peripheral surface of the insulator. The insulator is made from ceramic such as alumina. On at least a part of the outer peripheral surface of the insulator, a projected and recessed portion is formed on the front side relative to the engagement portion so as to helically extend in a circumferential direction of the insulator.
    Type: Application
    Filed: September 5, 2017
    Publication date: October 24, 2019
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Kengo Fujimura, Kimihiro Nishizono, Hiroki OTA
  • Publication number: 20180273625
    Abstract: Provided are a method of efficiently producing an sIL-2R antigen in an amount necessary for antibody generation, and a method of producing an anti-sIL-2R antibody using the antigen. Specifically, provided are a method of producing soluble interleukin-2 receptor, including culturing SCC-3 cells and recovering soluble interleukin-2 receptor from a culture of the cells, and a method of producing an anti-soluble interleukin-2 receptor antibody, including immunizing an animal with sIL-2R produced by the method.
    Type: Application
    Filed: September 29, 2016
    Publication date: September 27, 2018
    Applicant: SEKISUI MEDICAL CO., LTD.
    Inventors: Hiroyuki EBINUMA, Kengo FUJIMURA
  • Patent number: 9912126
    Abstract: An insulator is rendered less breakable. A spark plug insulator is a tube-shaped spark plug insulator having a through hole extending in a direction of an axial line. The spark plug insulator contains alumina as a main component and mullite at at least part of the insulator. Mullite is contained in only an inner circumferential surface of the tube-shaped spark plug insulator and in at least part of the inner circumferential surface of the spark plug insulator in an area extending toward a distal end from a portion having a largest outer diameter.
    Type: Grant
    Filed: July 23, 2015
    Date of Patent: March 6, 2018
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Kengo Fujimura, Toshitaka Honda, Hirokazu Kurono, Ryuji Nagae
  • Publication number: 20170256917
    Abstract: An insulator is rendered less breakable. A spark plug insulator is a tube-shaped spark plug insulator having a through hole extending in a direction of an axial line. The spark plug insulator contains alumina as a main component and mullite at at least part of the insulator. Mullite is contained in only an inner circumferential surface of the tube-shaped spark plug insulator and in at least part of the inner circumferential surface of the spark plug insulator in an area extending toward a distal end from a portion having a largest outer diameter.
    Type: Application
    Filed: July 23, 2015
    Publication date: September 7, 2017
    Inventors: Kengo FUJIMURA, Toshitaka HONDA, Hirokazu KURONO, Ryuji NAGAE
  • Patent number: 9570889
    Abstract: A spark plug with an insulator that includes: a first portion having a first inner diameter with a front end of a trunk portion of a metal terminal disposed therein; a second portion having a second inner diameter larger than the first inner diameter, and including a portion 1 mm or more forward of a rear end of the insulator; and a third portion disposed between the first portion and the second portion and having a third inner diameter larger than the first inner diameter and smaller than the second inner diameter. The trunk portion of the metal terminal includes: a front trunk portion and a rear trunk portion with a front end of the rear trunk portion positioned forward of a rear end of the third portion of the insulator, the rear trunk portion having an outer diameter larger than the outer diameter of the front trunk portion.
    Type: Grant
    Filed: July 7, 2016
    Date of Patent: February 14, 2017
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Kengo Fujimura, Haruki Yoshida
  • Publication number: 20170018909
    Abstract: A spark plug with an insulator that includes: a first portion having a first inner diameter with a front end of a trunk portion of a metal terminal disposed therein; a second portion having a second inner diameter larger than the first inner diameter, and including a portion 1 mm or more forward of a rear end of the insulator; and a third portion disposed between the first portion and the second portion and having a third inner diameter larger than the first inner diameter and smaller than the second inner diameter. The trunk portion of the metal terminal includes: a front trunk portion and a rear trunk portion with a front end of the rear trunk portion positioned forward of a rear end of the third portion of the insulator, the rear trunk portion having an outer diameter larger than the outer diameter of the front trunk portion.
    Type: Application
    Filed: July 7, 2016
    Publication date: January 19, 2017
    Inventors: Kengo FUJIMURA, Haruki YOSHIDA
  • Patent number: 9425585
    Abstract: An insulator used in a spark plug having improved strength and dielectric strength performance. The insulator comprises a sintered compact whose main constituent is alumina. In the sintered compact, a content ratio of a rare earth element (R. E.) and a group 2 element (2A) satisfies 0.1?R. E./2A ?1.4, and the content ratio of the R. E. and barium oxide (BaO) satisfies 0.2?BaO/R. E.?0.8. At least one virtual rectangular frame of 7.5 ?m×50 ?m surrounding crystals containing the rare earth element lies within a region of 630 ?m×480 ?m in any cross section of the sintered compact.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: August 23, 2016
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Kengo Fujimura, Toshimasa Saji, Hirokazu Kurono, Toshitaka Honda
  • 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
  • Patent number: 9054501
    Abstract: A spark plug includes: a center electrode including a rod portion and a head portion and having a diameter larger than the diameter of the rod portion; an insulator having an axial bore, the center electrode being disposed in the axial bore at its front end; and a seal portion for fixing the center electrode in the axial bore. The insulator comprises: a leg portion inner circumferential surface; a cylindrical trunk portion inner circumferential surface which surrounds the head portion; and a support surface which supports the head portion. The seal portion has: a seal portion outer circumferential surface; a seal portion abutment surface; and a connecting surface. In a cross section of the seal portion, a curve, which is part of the contour of the seal portion and is included in the connecting surface, has a radius of curvature R of 0.1 mm or more.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: June 9, 2015
    Assignee: NGK SPARK PLUG CO., LTD.
    Inventors: Kengo Fujimura, Hirokazu Kurono, Toshitaka Honda
  • 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: 20140243184
    Abstract: An insulator used in a spark plug having improved strength and dielectric strength performance. The insulator comprises a sintered compact whose main constituent is alumina. In the sintered compact, a content ratio of a rare earth element (R. E.) and a group 2 element (2A) satisfies 0.1?R. E./2A?1.4, and the content ratio of the R. E. and barium oxide (BaO) satisfies 0.2?BaO/R. E.?0.8. At least one virtual rectangular frame of 7.5 ?m×50 ?m surrounding crystals containing the rare earth element lies within a region of 630 ?m×480 ?m in any cross section of the sintered compact.
    Type: Application
    Filed: February 21, 2014
    Publication date: August 28, 2014
    Applicant: NGK Spark Plug Co., Ltd.
    Inventors: Kengo Fujimura, Toshimasa Saji, Hirokazu Kurono, Toshitaka Honda
  • Publication number: 20140210335
    Abstract: A spark plug includes: a center electrode including a rod portion and a head portion and having a diameter larger than the diameter of the rod portion; an insulator having an axial bore, the center electrode being disposed in the axial bore at its front end; and a seal portion for fixing the center electrode in the axial bore. The insulator comprises: a leg portion inner circumferential surface; a cylindrical trunk portion inner circumferential surface which surrounds the head portion; and a support surface which supports the head portion. The seal portion has: a seal portion outer circumferential surface; a seal portion abutment surface; and a connecting surface. In a cross section of the seal portion, a curve, which is part of the contour of the seal portion and is included in the connecting surface, has a radius of curvature R of 0.1 mm or more.
    Type: Application
    Filed: August 31, 2012
    Publication date: July 31, 2014
    Applicant: NGK SPARK PLUG CO., LTD.
    Inventors: Kengo Fujimura, Hirokazu Kurono, Toshitaka Honda