Patents by Inventor Katsumi Isogimi

Katsumi Isogimi 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).

  • GPS receiver and terminal device having search frequency band switching function
    Patent number: 6384774
    Abstract: A terminal device has a GPS receiver which receives GPS signals from a GPS satellite. The terminal device has an operation unit for instructing operation modes of the GPS receiver, and the GPS receiver has a clock unit, a radio frequency unit and a data extraction unit. The data extraction unit extracts GPS data by scanning signal-to-noise ratios of each frequency over a search frequency band. When a band correction mode is instructed by the operation unit, the data extraction unit switches its search frequency band from a first frequency band determined based on a maximum temperature-dependent change in the frequency of a clock signal to a second frequency band determined based on a maximum aging-dependent change in the frequency of the clock signal.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: May 7, 2002
    Assignees: Denso Corporation, NTT Docomo, Inc.
    Inventors: Katsuhiko Mutoh, Osamu Yamamori, Katsumi Isogimi