Patents by Inventor Kohki Aizawa

Kohki Aizawa 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 electronic impedance circuit
    Patent number: 4525636
    Abstract: A variable electronic impedance circuit contains a voltage-current converter having an input terminal which is supplied with an input signal voltage, and a variable-gain current amplifier having an input terminal which is supplied with an output current of the voltage-current converter. The output signal current of the amplifier is fed back to the input terminal of the voltage-current converter.In order to prevent undesirable oscillation immediately after the closure of a power supply switch, the variable electronic impedance circuit includes a control circuit which substantially inhibits the operation of the voltage-current converter for a predetermined time after the closure of the power supply switch.
    Type: Grant
    Filed: August 30, 1982
    Date of Patent: June 25, 1985
    Assignees: Hitachi, Ltd., Pioneer Electronic Corp.
    Inventors: Yasuo Kominami, Yuichi Ohkubo, Kohki Aizawa, Satoshi Sasaki