Patents by Inventor Isao Arika

Isao Arika 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).

  • Variable-capacitance tuning circuit for high-frequency signals
    Patent number: 4675634
    Abstract: In a variable capacitance tuning circuit for high-frequency signals, a first varactor diode is connected between either the receiving end or feeding end and ground, one end of a tuning coil is connected to the receiving end or feeding end, and a second varactor diode is connected between the other end of the tuning coil and ground.
    Type: Grant
    Filed: August 7, 1985
    Date of Patent: June 23, 1987
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Seiji Matsushita, Akira Fujishima, Isao Arika, Joji Nakamura