Patents by Inventor Kozo Kakehi

Kozo Kakehi 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).

  • Split resin seal ring with chamfered end connection structures
    Patent number: 5934680
    Abstract: A composite step-cut type synthetic resin seal ring having a pair of abutments provided at one circumferential point of the ring body and spaced from each other. Each abutment has end face and comprises a protrusion and a shoulder provided adjacent to each other. The protrusion is provided on one axial side of the ring body and the shoulder is provided on the other axial side of the ring body. The end face, protrusion and shoulder of one abutment are complementary in shape to the end face, shoulder and protrusion of the other abutment, respectively.
    Type: Grant
    Filed: May 31, 1996
    Date of Patent: August 10, 1999
    Assignee: NTN Corporation
    Inventors: Kozo Kakehi, Jiro Matsumoto
  • Oil seal ring of synthetic resin having angularly displaced injection point
    Patent number: 5628519
    Abstract: A seal ring having uniform dimensions and uniform composition over the entire length thereof. This is achieved by properly positioning the injection point for injecting a material when injection-molding the seal ring. More specifically, the injection point is angularly displaced from the center of the entire length of the seal ring by .+-.1.degree. to .+-.30.degree..
    Type: Grant
    Filed: December 28, 1995
    Date of Patent: May 13, 1997
    Assignee: NTN Corporation
    Inventor: Kozo Kakehi