Patents by Inventor Makoto Ishiwata

Makoto Ishiwata 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).

  • Peak detector circuit for FM measuring apparatus
    Patent number: 4737730
    Abstract: A peak detector circuit comprises a peak detecting diode circuitry for detecting peaks in an input FM demodulated signal, a capacitor connected to the output of the diode circuitry, a first resistor connected in parallel with the capacitor, and an amplifier connected to the output of the diode circuitry and having a high input impedance. A second resistor is connected to the first resistor in parallel therewith through a turn-on/off switch for discharging and subsequently charging the capacitor within a short time in response to detection of decreasing in the level of the input FM demodulated signal.
    Type: Grant
    Filed: July 21, 1986
    Date of Patent: April 12, 1988
    Assignee: Ando Electric Co., Ltd.
    Inventors: Makoto Ishiwata, Masayoshi Asai