Patents by Inventor Hideyuki Hamanaka

Hideyuki Hamanaka 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 fan means for heating chamber of microwave cooking device
    Patent number: 4339647
    Abstract: A microwave cooking device having a main body provided therein with a heating chamber adapted for receiving foodstuffs to be cooked, a magnetron for irradiating microwave energy onto the interior of the heating chamber, and an air charging and discharging fan for forcing air to charge into and out of the heating chamber, such charging and discharging occurring through an air charging opening disposed in the heating chamber, the invention characterized in that a circulation fan for circulating air within the heating chamber is provided within the heating chamber in a fashion such that said fan is connected to a shaft common to both the air charging and air discharging fan.
    Type: Grant
    Filed: April 17, 1980
    Date of Patent: July 13, 1982
    Assignee: Rinnai Kabushiki Kaisha
    Inventors: Minoru Inayama, Hideyuki Hamanaka