Patents by Inventor Akira Hyougo

Akira Hyougo 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).

  • Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus
    Patent number: 7330708
    Abstract: There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resistance-adjustment circuit comprises a series circuit of a resistor and a switching element having an ON-resistance smaller than the resistance of the resistor, and turning on/off the switching element causes the resistance of the tuning circuit when resonant to change.
    Type: Grant
    Filed: November 30, 2004
    Date of Patent: February 12, 2008
    Assignees: Sanyo Electric Co., Ltd., Tokyo University of Science
    Inventors: Masahiro Umewaka, Hiroya Yamamoto, Keitarou Sekine, Akira Hyougo, Keiji Morijiri
  • Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus
    Publication number: 20050147193
    Abstract: There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resistance-adjustment circuit comprises a series circuit of a resistor and a switching element having an ON-resistance smaller than the resistance of the resistor, and turning on/off the switching element causes the resistance of the tuning circuit when resonant to change.
    Type: Application
    Filed: November 30, 2004
    Publication date: July 7, 2005
    Applicants: Sanyo Electric Co., Ltd., Tokyo University of Science
    Inventors: Masahiro Umewaka, Hiroya Yamamoto, Keitarou Sekine, Akira Hyougo, Keiji Morijiri