Patents by Inventor Shinichi Nishijima

Shinichi Nishijima 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).

  • Sliding spline shaft device
    Patent number: 11927225
    Abstract: A sliding spline shaft device of the present invention includes a male spline and a female spline that is fitted to the male spline in an axially slidable manner, and at least one of the splines has a surface processed layer. The surface processed layer includes an undercoat layer, an intermediate layer containing phosphate, and a topcoat layer containing solid lubricant, in this order. The undercoat layer contains iron nitride and/or iron carbide. Thus, the surface of a base material has high hardness. As a result, microscopic deformation of the sliding surface is reduced, and increase in a real contact area is suppressed, whereby stick-slip is prevented.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: March 12, 2024
    Assignees: NISSAN MOTOR CO., LTD., NIHON PARKERIZING CO., LTD.
    Inventors: Shigetoshi Kashiwabara, Kunio Katada, Shunsuke Hiraiwa, Akihumi Kawaguchi, Takeo Nishijima, Shinichi Suzuki, Yasuyuki Katsumada, Makoto Nakajima, Tokunori Kodama, Masato Ito, Aiki Iwasa
  • Frame assembly for snowmobile
    Patent number: 6926107
    Abstract: A snowmobile has a frame assembly. The frame assembly has a front portion and a rear portion. The front portion has a frame member that extends over an engine compartment such that an engine would be disposed generally below the frame member. The frame member is primarily formed with an extruded component that is bent into a U-shape. An air intake box can be supported by the frame member.
    Type: Grant
    Filed: December 7, 2001
    Date of Patent: August 9, 2005
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Shinichi Nishijima
  • Snowmobile exhaust system
    Patent number: 6808034
    Abstract: A snowmobile has a frame construction that defines a recess above a drive unit. The recess is formed by a horizontal member and a pair of vertical members. A portion of the exhaust system extends within the recess at a location above the drive unit. An exhaust system cooling passage is provided to reduce temperature rise of the exhaust system.
    Type: Grant
    Filed: December 20, 2002
    Date of Patent: October 26, 2004
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventors: Takuji Nakano, Shinichi Nishijima
  • Snowmobile exhaust system
    Patent number: 6802383
    Abstract: A snowmobile has a frame construction that defines a recess above a drive unit. The recess is formed by a horizontal member and a pair of vertical members. A portion of the exhaust system extends within the recess at a location above the drive unit.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: October 12, 2004
    Assignee: Yamaha Hatsudoki Kabushiki Kaisha
    Inventor: Shinichi Nishijima
  • Snowmobile exhaust system
    Publication number: 20030150658
    Abstract: A snowmobile has a frame construction that defines a recess above a drive unit. The recess is formed by a horizontal member and a pair of vertical members. A portion of the exhaust system extends within the recess at a location above the drive unit. An exhaust system cooling passage is provided to reduce temperature rise of the exhaust system.
    Type: Application
    Filed: December 20, 2002
    Publication date: August 14, 2003
    Inventors: Takuji Nakano, Shinichi Nishijima
  • Snowmobile exhaust system
    Publication number: 20020112909
    Abstract: A snowmobile has a frame construction that defines a recess above a drive unit. The recess is formed by a horizontal member and a pair of vertical members. A portion of the exhaust system extends within the recess at a location above the drive unit.
    Type: Application
    Filed: December 10, 2001
    Publication date: August 22, 2002
    Inventor: Shinichi Nishijima
  • Frame assembly for snowmobile
    Publication number: 20020100631
    Abstract: A snowmobile has a frame assembly. The frame assembly has a front portion and a rear portion. The front portion has a frame member that extends over an engine compartment such that an engine would be disposed generally below the frame member. The frame member is primarily formed with an extruded component that is bent into a U-shape. An air intake box can be supported by the frame member.
    Type: Application
    Filed: December 7, 2001
    Publication date: August 1, 2002
    Inventor: Shinichi Nishijima