Patents by Inventor Harumi Kanai

Harumi Kanai 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).

  • Piezoelectric transducer
    Patent number: 5142511
    Abstract: A piezoelectric transducer having electrodes formed on both surfaces has a piezoelectric base molded as a curved plate which can converge sound fields of acoustic waves at an arbitrary point and which can reduce noise or reverberation in a lateral direction which otherwise occur due to unnecessary vibration. At least one of the electrodes is divided concentrically. A material having a small electromechanical coupling factor K.sub.p in the lateral direction is used for the piezoelectric material, preferably porous PZT.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: August 25, 1992
    Assignee: Mitsubishi Mining & Cement Co., Ltd.
    Inventors: Harumi Kanai, Yoshiaki Tanaka, Kazuyasu Hikita
  • Piezoelectric transducer
    Patent number: 5122993
    Abstract: A piezoelectric transducer having plural piezoelectric transducer elements which can generate mechanical vibrations converging substantially on one point. The transducer is formed to control the convergent point by insulating piezoelectric transducer elements mechanically, arranging them concentrically and driving them independently and separately from each other.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: June 16, 1992
    Assignee: Mitsubishi Mining & Cement Co., Ltd.
    Inventors: Kazuyasu Hikita, Harumi Kanai, Yoshiaki Tanaka