Patents by Inventor Noritake Ookawa

Noritake Ookawa 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).

  • Lubricant composition and speed reducer using the same, and electrically operated power steering device using the same
    Patent number: 7452850
    Abstract: Disclosed are a lubricant composition obtained by adding a buffer particles having an average particle diameter D1 of 50 ?m<D1?300 ?m to a lubricant, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, and noise produced in the speed reduction gear can be made lower than ever before irrespective of the magnitude of backlash in a case where a worm and a worm wheel are combined with each other and without complicating the configuration of the speed reduction gear by the buffer action of the buffer particles added to the lubricant composition, thereby making it possible to reduce noise produced in an automobile caused by the electric power steering apparatus at low cost.
    Type: Grant
    Filed: September 25, 2003
    Date of Patent: November 18, 2008
    Assignee: Jtekt Corporation
    Inventors: Kouji Kitahata, Fumiaki Kasahara, Naoki Uchida, Noritake Ookawa, Hiroaki Murakami
  • Lubricant composition and speed reducer using the same, and electrically operated power steering device using the same
    Publication number: 20060058201
    Abstract: Disclosed are a lubricant composition obtained by adding a buffer particles having an average particle diameter D1 of 50 ?m<D1?300 ?m to a lubricant, a speed reduction gear filled with the lubricant composition, and an electric power steering apparatus having the speed reduction gear incorporated therein, and noise produced in the speed reduction gear can be made lower than ever before irrespective of the magnitude of backlash in a case where a worm and a worm wheel are combined with each other and without complicating the configuration of the speed reduction gear by the buffer action of the buffer particles added to the lubricant composition, thereby making it possible to reduce noise produced in an automobile caused by the electric power steering apparatus at low cost.
    Type: Application
    Filed: September 25, 2003
    Publication date: March 16, 2006
    Applicant: Koyo Seiko Co., Ltd
    Inventors: Kouji Kitahata, Fumiaki Kasahara, Naoki Uchida, Noritake Ookawa, Hiroaki Murakami