Patents by Inventor Yoichi Saigo

Yoichi Saigo 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).

  • Filter combining surface acoustic wave resonators
    Patent number: 4803449
    Abstract: This invention relates to the structure of a band-pass or band-rejection filters by combining a plurality of one-port surface acoustic wave resonators whose interdigital electrode fingers are disposed on a piezoelectric substrate. The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-port surface acoustic wave resonators disposed on a piezoelectric substrate for transmitting elastic surface wave and a plurality of circuit elements containing capacitance elements, and one-port surface acoustic wave resonators disposed between the electrodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection- and passing-band.
    Type: Grant
    Filed: November 18, 1987
    Date of Patent: February 7, 1989
    Assignees: Hitachi Video Engineering, Inc., Hitachi, Ltd.
    Inventors: Mitsutaka Hikita, Yoichi Saigo, Kazuhito Kurosawa