Patents by Inventor Tetsuro Maruhama

Tetsuro Maruhama 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).

  • Moving object communication control system
    Patent number: RE28867
    Abstract: A communication system between mobile and wayside stations wherein the mobile stations are traveling on a track which is divided into sections by means of an open-type transmission line paralleling the track. A frequency selection and conversion device for each section of transmission line or track is connected to the transmission line to define the length of each section. A series of lower frequency carriers transmitted on the line are allotted respectively to each specific section of transmission line. These low-frequency carriers travel with a low loss along the transmission line and they are selected and converted by their respective frequency selection and converter device to a common high-frequency carrier signal for leaky transmission to a mobile station on the corresponding track section.
    Type: Grant
    Filed: February 5, 1973
    Date of Patent: June 15, 1976
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takeshi Baba, Kenji Shibuya, Tetsuro Maruhama, Tsuneo Nakahara, Kenichi Yoshida