Patents by Inventor Youichi Kawaguchi

Youichi Kawaguchi 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).

  • Radiotelephone system that maintains synchronization between base and subordinate units while shifting carrier frequencies
    Patent number: 5133002
    Abstract: A radiotelephone system having a base unit and a plurality of subordinate units for carrying out radiocommunication between the base unit and the subordinate units. The base unit sends transmitting carriers to the subordinate units and gets receiving carriers from the subordinate units. The system includes a first frequency varying part for periodically shifting transmitting/receiving carrier frequencies of the base unit from a given frequency of one operating interval to another frequency of another operating interval. A first synchronizing signal part generates a synchronizing signal in synchronism with a time period determined from the shifting of the carrier frequencies. A second synchronizing signal part extracts a synchronizing signal from a receiving carrier signal received by each of the subordinate units.
    Type: Grant
    Filed: July 20, 1990
    Date of Patent: July 21, 1992
    Assignee: ASCII Corporation
    Inventors: Hajime Kikuchi, Kazuhiko Nishi, Youichi Kawaguchi