Patents by Inventor Youichi Amemiya

Youichi Amemiya 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).

  • Electro-hydraulic pulse motor
    Patent number: 4031811
    Abstract: This disclosure relates to an improved electro-hydraulic pulse motor wherein safety valves are arranged in hydraulic circuits provided for the hydraulic motor part of an electro-hydraulic pulse motor so as to release abnormal high pressure produced in the circuits due to sudden interruption of the operation of an electric pulse motor part of the electro-hydraulic pulse motor. As a result, breakage of the circuits or four way pilot valve part of the electro-hydraulic pulse motor can be avoided.
    Type: Grant
    Filed: January 19, 1972
    Date of Patent: June 28, 1977
    Assignee: Fujitsu Ltd.
    Inventors: Seiuemon Inaba, Kanryo Shimizu, Kohei Ito, Youichi Amemiya, Gotaro Gamo