Patents by Inventor Kazumasa KIYONAGA

Kazumasa KIYONAGA 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).

  • Power supply device and image forming apparatus including the power supply device
    Patent number: 10871737
    Abstract: A power supply device is connectable to a commercial power supply to output power to a supply destination device. The power supply device includes a filter circuit and a switching unit. The filter circuit includes a capacitor unit. The switching unit is configured to switch a capacitor capacity of the capacitor unit.
    Type: Grant
    Filed: July 24, 2019
    Date of Patent: December 22, 2020
    Assignee: Ricoh Company, Ltd.
    Inventors: Takuya Tanimura, Kazumasa Kiyonaga, Yoshiteru Hagiwara
  • POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS INCLUDING THE POWER SUPPLY DEVICE
    Publication number: 20200041942
    Abstract: A power supply device is connectable to a commercial power supply to output power to a supply destination device. The power supply device includes a filter circuit and a switching unit. The filter circuit includes a capacitor unit. The switching unit is configured to switch a capacitor capacity of the capacitor unit.
    Type: Application
    Filed: July 24, 2019
    Publication date: February 6, 2020
    Applicant: Ricoh Company, Ltd.
    Inventors: Takuya TANIMURA, Kazumasa KIYONAGA, Yoshiteru HAGIWARA