Patents by Inventor Toshio Makio

Toshio Makio 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).

  • Pilot operated pressure and vacuum relief valve
    Patent number: 4016903
    Abstract: A pilot operated pressure and vacuum relief valve which is adapted to open both at times when fluid pressure in a system in which the valve is connected exceeds a predetermined high value and at times when such pressure falls below a predetermined lower value.Said valve comprises a housing, a first valve means slidably inserted in said housing, a second valve means slidably inserted in said first valve means, a regulating member inserted in said first and second valve means, extending from the front end portion to rear end portion of said first valve means, and first and second springs disposed in said housing and said first valve means located and constructed so as to bias said first valve means and said second valve means respectively.
    Type: Grant
    Filed: December 1, 1975
    Date of Patent: April 12, 1977
    Assignee: Kabushiki Kaisha Komatsu Seisakusho
    Inventors: Mitsumasa Akashi, Toshio Makio