Patents by Inventor Takeshi Wakuda

Takeshi Wakuda 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
    Publication number: 20070170659
    Abstract: A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.
    Type: Application
    Filed: February 23, 2007
    Publication date: July 26, 2007
    Applicants: Koichi Hatamura, KOKUSAN PARTS INDUSTRY CO., LTD.
    Inventors: Koichi Hatamura, Takashi Suzuki, Hiroyuki Ogino, Takahiko Sugiura, Yasuyuki Okudaira, Takeshi Wakuda, Reiji Mahigashi, Keisuke Umehara, Masahisa Kumashiro
  • Metal gasket
    Patent number: 7204491
    Abstract: A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.
    Type: Grant
    Filed: January 21, 2005
    Date of Patent: April 17, 2007
    Assignees: Kokusan Parts Industry Co., Ltd.
    Inventors: Koichi Hatamura, Takashi Suzuki, Hiroyuki Ogino, Takahiko Sugiura, Yasuyuki Okudaira, Takeshi Wakuda, Reiji Mahigashi, Keisuke Umehara, Masahisa Kumashiro
  • Metal gasket
    Publication number: 20050173868
    Abstract: A metal gasket capable of preventing the occurrence of cracks in a stopper while employing a wave-shaped stopper, improving the contact pressure balance around the bead to enhance the engine performance, and improving the durability of the stopper. The metal gasket is constituted by a gasket component sheet having an opening formed to face a combustion chamber, and the gasket component sheet is provided with a combustion chamber bead surrounding the opening. An inner circumference side stopper lower than the height of the combustion chamber bead is formed along the combustion chamber bead in a portion between the combustion chamber bead and the opening such that at least a section of each wave where stress amplitude is large becomes thin, a thin portion and a thick portion are arranged alternately in each wave, and the hardness of the thin portion is higher than that of the thick portion.
    Type: Application
    Filed: January 21, 2005
    Publication date: August 11, 2005
    Applicants: Koichi HATAMURA, KOKUSAN PARTS INDUSTRY CO., LTD
    Inventors: Koichi Hatamura, Takashi Suzuki, Hiroyuki Ogino, Takahiko Sugiura, Yasuyuki Okudaira, Takeshi Wakuda, Reiji Mahigashi, Keisuke Umehara, Masahisa Kumashiro