Patents by Inventor Nobuo Ishigami

Nobuo Ishigami 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).

  • Top entry ball valve and a clamp therefor
    Patent number: 4658978
    Abstract: A top entry ball valve is proposed which has a valve body formed with a valve chamber, a valve mounted in the valve chamber, a seat ring at the low-pressure side, and a seat ring assembly having another seat ring, a belleville spring and a seat ring holder at the high-pressure side. The seat ring assembly can be easily mounted into and removed out of the valve chamber by use of a clamp while comprising the belleville spring. The clamp comprises a pair of clamping pieces fastened together with a bolt.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: April 21, 1987
    Assignee: Nippon Ball Valve Co., Ltd.
    Inventors: Morio Ikematsu, Tohru Wada, Tohru Nakanishi, Nobuo Ishigami