Patents by Inventor Seijiro Ishikzuka

Seijiro Ishikzuka 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).

  • Portable telephone with microstrip antennas
    Patent number: 5903821
    Abstract: In a portable telephone, a pair of microstrip antennas (1), (2) for signal reception and signal transmission with adjacent resonance frequencies different from each other are approximately arranged on the same plane at predetermined intervals. Accordingly, in the portable telephone, neither antenna becomes a hindrance when storing the portable telephone into a pocket of a coat, etc., and it is not necessary to operate the antenna at a signal receiving time, during calling time or after the operator is finished using the portable telephone.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: May 11, 1999
    Assignee: Sony Corporation
    Inventor: Seijiro Ishikzuka