Patents by Inventor Masao Igarashi

Masao Igarashi 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).

  • Distributed-constant filter
    Patent number: 4901044
    Abstract: A quarter-wave distributed-constant dielectric filter or resonator having a ceramic body which typically is composed principally of barium titanate. The ceramic filter body has one or more resonance holes extending therethrough. A conductive covering of silver or the like on the filter body has a portion formed on the surface defining each resonance hole. Mounted in each resonance hole is a prefabricated capacitor having a first terminal extending from within the resonance hole. The second terminal is electrically coupled to the conductive covering on the surface of the resonance hole. The capacitance of the capacitor or capacitors can be known before they are mounted to the filter body, so that the filter is readily manufacturable to exact electrical characteristics desired.
    Type: Grant
    Filed: January 5, 1989
    Date of Patent: February 13, 1990
    Assignee: Taiyo Yuden Co., Ltd.
    Inventors: Masao Igarashi, Isao Akiyama, Kazuhiro Kumagai, Yoshinobu Takeda, Mamoru Yamaki, Yoshiaki Iguchi, Satoshi Kazama