Patents by Inventor Masakazu Katumaru

Masakazu Katumaru 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).

  • Combined oil ring
    Patent number: 7077402
    Abstract: A combined oil ring 4 is comprised of an oil ring 5 having upper and lower rails 7 and 8, and an expander 6 for applying contact pressure radially outwards on the oil ring 5. The outer circumferential surface 11 of the upper rail 7 of the oil ring 5 is comprised of a flat surface 11a with an axial width of 0.05 to 0.3 millimeters, a curved surface 11b joining to the upper end of the flat surface 11a and to the upper surface 12 of the upper rail 7, and a curved surface 11c joining to the lower end of the flat surface 11a and to the lower surface 13 of the upper rail 7. The lower rail 8 is formed in the same way.
    Type: Grant
    Filed: December 5, 2003
    Date of Patent: July 18, 2006
    Assignee: Teikoku Piston Ring Co., Ltd.
    Inventors: Masakazu Katumaru, Seiji Tamaki, Masami Kawasaki
  • Combined oil ring
    Publication number: 20040119242
    Abstract: A combined oil ring 4 is comprised of an oil ring 5 having upper and lower rails 7 and 8, and an expander 6 for applying contact pressure radially outwards on the oil ring 5. The outer circumferential surface 11 of the upper rail 7 of the oil ring 5 is comprised of a flat surface 11a with an axial width of 0.05 to 0.3 millimeters, a curved surface 11b joining to the upper end of the flat surface 11a and to the upper surface 12 of the upper rail 7, and a curved surface 11c joining to the lower end of the flat surface 11a and to the lower surface 13 of the upper rail 7. The lower rail 8 is formed in the same way.
    Type: Application
    Filed: December 5, 2003
    Publication date: June 24, 2004
    Applicant: TEIKOKU PISTON RING CO., LTD.
    Inventors: Masakazu Katumaru, Seiji Tamaki, Masami Kawasaki