Patents by Inventor Kazumasa Ishikawa

Kazumasa Ishikawa 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).

  • Frequency characteristic adjusting circuit
    Patent number: 4336501
    Abstract: In a frequency characteristic adjusting circuit having an arrangement of at least one adder, a filter circuit and feedback and/or feed forward means the transfer factors of which and the peak or dip of the filter circuit are freely selectable. Adjustment of the center frequency and Q are independent.
    Type: Grant
    Filed: September 18, 1979
    Date of Patent: June 22, 1982
    Assignee: Nippon Columbia Kabushiki Kaisha
    Inventors: Kazumasa Ishikawa, Shin-ichi Takahashi, Masahide Yoneyama