Patents by Inventor Kouji Sonda

Kouji Sonda 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).

  • Method for measuring radio-frequency current
    Patent number: 6333634
    Abstract: A radio-frequency power supply (1) and a matching box (2) are electrically connected with a coaxial cable (4) while the matching box (2) and a main unit (3) are electrically connected with a coaxial cable (5). Around the coaxial cable (5), a radio-frequency current transformer (6) is provided and an output signal from the radio-frequency current transformer (6) is given to an oscilloscope (7). In an apparatus using the radio-frequency power supply, with this constitution, a method for measuring a radio-frequency current can be provided, by which spurious components and frequency variation of the radio-frequency current can be measured simply and precisely at a low cost, without changing a series of communication paths, such as the coaxial cable, for the radio-frequency current.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: December 25, 2001
    Assignees: Mitsubishi Denki Kabushiki Kaisha, Ryoden Semiconductor System Engineering Corporation
    Inventors: Kenji Haze, Kouji Sonda