Patents by Inventor Koichi Tsubomoto

Koichi Tsubomoto 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).

  • Patent number: 4967996
    Abstract: The pilot type controlled electromagnetic valve system in accordance with the present invention is opened and closed principally by means of automatic remote control.The controlled valve system comprises a main valve F; a pilot valve G for opening and closing the main valve F by means of the fluid pressure on the primary side; a latching solenoid H for opening and closing the pilot valve G; and a solenoid drive control unit I for driving the solenoid H by supplying a discharge current from a capacitor to the solenoid. A pulse discharge current is supplied to the solenoid H from the capacitor C only when the pilot valve G is opened or closed, and no excitation current is supplied continuously through the coil of the solenoid. As a result, the power source battery can be reduced in size, and therefore virtually no accidents take place in the controlled valve system due to no heat generation in the coil.
    Type: Grant
    Filed: June 19, 1989
    Date of Patent: November 6, 1990
    Assignee: Masako Kiyohara
    Inventors: Yoshiteru Sonoda, Atsuo Tomita, Eiji Ideta, Koji Nishino, Koichi Tsubomoto