Patents by Inventor Kazushige Onaka

Kazushige Onaka 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).

  • Method of conditioning a rotary valve seat
    Patent number: 4467510
    Abstract: A method of forming concavities in a cast iron valve seat to which lubricating oil may be applied to reduce the abrasion between the valve seat and a handle operated rotary valve that is slidably engagable with the valve seat. Pockets of graphite are formed at the valve seat surface by heat treating the valve seat, following which the valve seat undergoes a lapping process that removes the graphite and leaves numerous concavities in the valve seat surface. These concavities hold the lubrication and thus extend the abrasion-free life of the rotary valve and valve seat interface to enhance the metal-to-metal seal thereat.
    Type: Grant
    Filed: January 8, 1982
    Date of Patent: August 28, 1984
    Assignee: Nippon Air Brake Co., Ltd.
    Inventors: Takao Kinoshita, Kazushige Onaka