Patents by Inventor Hirotaka Muragishi

Hirotaka Muragishi 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).

  • Metal gasket
    Patent number: 11156293
    Abstract: A metal gasket containing a metal plate having an opening portion and having a seal bead having a bent cross-sectional shape formed along the opening portion in order to suppress a variation in the height of the seal bead due to a tensile stress generated in the outer periphery of the seal bead in the molding of the seal bead is provided with a lightening hole extending along the outer periphery of the seal bead, in which the distance between the lightening hole and the seal bead is constant.
    Type: Grant
    Filed: October 17, 2017
    Date of Patent: October 26, 2021
    Inventors: Kento Ide, Katsuma Imai, Hirotaka Muragishi
  • METAL GASKET
    Publication number: 20190383231
    Abstract: A metal gasket containing a metal plate having an opening portion and having a seal bead having a bent cross-sectional shape formed along the opening portion in order to suppress a variation in the height of the seal bead due to a tensile stress generated in the outer periphery of the seal bead in the molding of the seal bead is provided with a lightening hole extending along the outer periphery of the seal bead, in which the distance between the lightening hole and the seal bead is constant.
    Type: Application
    Filed: October 17, 2017
    Publication date: December 19, 2019
    Inventors: Kento IDE, Katsuma IMAI, Hirotaka MURAGISHI
  • Process for production of gaskets
    Patent number: 8003030
    Abstract: The process for producing gaskets includes the steps of: forming a metal core material (2) using a stainless steel plate; treating the resulting metal core material (2) with an alkali treating solution; preparing an unvulcanized rubber molded product (1); mounting the metal core material (2) treated in the treating step to the unvulcanized rubber molded product (1); and vulcanizing the rubber-molded product to thereby anchor the elastic material to the metal core material (2) without using an adhesive; characterized in that the alkali treating solution used in the step of alkali treatment includes the following components (A), (B), and (C): (A) an alkali metal hydroxide or an alkaline earth metal hydroxide; (B) an alkali metal silicate or an alkaline earth metal silicate; and (C) a carboxylate salt.
    Type: Grant
    Filed: December 5, 2007
    Date of Patent: August 23, 2011
    Assignee: NOK Corporation
    Inventors: Syuji Yoshitsune, Masaru Ito, Hirotaka Muragishi, Tomoyuki Koyama
  • Process for Production of Gaskets
    Publication number: 20100024195
    Abstract: The invention provides a process for producing gaskets that is capable of improving the wettability of the metal surface to thereby enhance the tackiness when rubber is anchored to a metal core material without using an adhesive.
    Type: Application
    Filed: December 5, 2007
    Publication date: February 4, 2010
    Applicant: NOK CORPORATION
    Inventors: Syuji Yoshitsune, Masaru Ito, Tomoyuki Koyama, Hirotaka Muragishi