Patents by Inventor Chugi Nakajima

Chugi Nakajima 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 cylinder
    Patent number: 3975991
    Abstract: A hydraulic cylinder is disclosed wherein a seal ring is fitted around the side surface of a plunger which in turn is fitted into a cylinder in such a way that there is a clearance between the seal ring and the plunger, and oil passages are formed through the seal ring, thereby at the lower part of the seal ring, exerting to the seal ring the upward force which may encounter the downward oil pressure exerted to the seal ring.
    Type: Grant
    Filed: July 11, 1974
    Date of Patent: August 24, 1976
    Assignee: Ishikawajima-Harima Jukogyo Kabushiki Kaisha
    Inventor: Chugi Nakajima