Patents by Inventor Tadanori Fujisawa

Tadanori Fujisawa 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).

  • Dual-band multilayer bandpass filter
    Patent number: 6147571
    Abstract: A dual-band multilayer bandpass filter having a first filter unit (18) for filtering a first signal having a first frequency and a second filter unit (19) for filtering a second signal having a second frequency. First and second filter units are arranged in stacked ceramic layers. A first blocking element (20a, 20b; 25a, 25b; 25a', 25b'; 46a, 46b) is coupled to the first filter unit (18) for blocking the second signal from being applied to the first filter unit (18). A second blocking element (21a, 21b; 26a, 26b; 25c, 25d; 27a, 27b) is coupled to the second filter unit (19) for blocking the first signal from being applied to the second filter unit (19).
    Type: Grant
    Filed: January 20, 1999
    Date of Patent: November 14, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shoichi Kitazawa, Toru Yamada, Toshio Ishizaki, Koichi Ogawa, Makoto Fujikawa, Tadanori Fujisawa, Kaoru Ishida, Yoshitaka Nagatomi