Patents by Inventor Shigeo Hurukawa

Shigeo Hurukawa 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).

  • Diplexer duplexer and two-channel mobile communications equipment
    Patent number: 6366564
    Abstract: A diplexer employed in mobile communications equipment such mobile phones which can divide signals into two channels with a simple configuration without interfering the other band. In this diplexer, an inductor 105 is connected between a &pgr;-type three-stage one polar low-pass filter 115 and a common terminal 113 as a first matching circuit, and a capacitor 106A is connected between a one polar band-pass filter 116 and a common terminal 113 as a second matching circuit so that interference with the other band can be prevented and the higher harmonics can be sufficiently attenuated with simple configuration.
    Type: Grant
    Filed: May 26, 1998
    Date of Patent: April 2, 2002
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Masahiro Hiraka, Hidenori Katsumura, Ryuichi Saito, Hiroshi Kushitani, Naoki Yuda, Shigeo Hurukawa, Suzushi Kimura