Patents by Inventor Mititoshi Mitumaru

Mititoshi Mitumaru 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).

  • Endless backup ring for hydraulic apparatus seal
    Patent number: 4660839
    Abstract: An endless backup ring for hydraulic apparatus seal comprises a ring-like body having, a plurality of notches extending radially through a portion of the ring-like body and forming a staggered relationship in the circumferential direction between each others to enable said ring-like body to expand circumferentially when stretched.
    Type: Grant
    Filed: December 9, 1985
    Date of Patent: April 28, 1987
    Assignee: Koyo Seiko, Co. Ltd.
    Inventor: Mititoshi Mitumaru