Patents by Inventor Takao Totsuka

Takao Totsuka 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).

  • High-frequency circuit apparatus and communication apparatus using the same
    Publication number: 20080070515
    Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.
    Type: Application
    Filed: October 30, 2007
    Publication date: March 20, 2008
    Applicant: HITACHI MEDIA ELECTRONICS CO., LTD.
    Inventors: Takao Totsuka, Takashi Shiba, Osamu Hikino
  • High-frequency circuit apparatus and communication apparatus using the same
    Publication number: 20070183348
    Abstract: A high-frequency circuit has a duplexer and a filter. The duplexer performs wave separation of send and received signals as input thereto. The filter filters the input send signal. When the send and received signals of the first modulation method are input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer. When the received signal of the first modulation method is input, the send signal and the received signal of the first modulation method are wave-separated and output by the duplexer, and the send signal of the second modulation method is filtered by the filter.
    Type: Application
    Filed: July 3, 2006
    Publication date: August 9, 2007
    Inventors: Takao Totsuka, Takashi Shiba, Osamu Hikino