Patents by Inventor Yugi Kurematsu

Yugi Kurematsu 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).

  • Hydraulic tensioner
    Patent number: 7918754
    Abstract: A hydraulic tensioner comprises a plunger, and a plunger-accommodating hole in a tensioner housing, together forming a high pressure oil chamber. A plunger-biasing spring is provided in the high pressure oil chamber between the plunger and the bottom of the plunger-accommodating hole. An oil storage chamber is formed inside the plunger, and a check valve unit is press-fit in the rear end of the plunger to allow flow from the oil storage chamber to the high pressure oil chamber while blocking reverse flow of oil.
    Type: Grant
    Filed: April 2, 2008
    Date of Patent: April 5, 2011
    Assignee: Tsubakimoto Chain Co.
    Inventor: Yugi Kurematsu