Patents by Inventor Daisyuu Hirayama

Daisyuu Hirayama 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).

  • Microorganism multiplication preventing method and apparatus
    Patent number: 6103190
    Abstract: A method for preventing microorganism multiplication, including using a gas containing a low concentration of ozone and a high concentration of ions, so that the multiplication of microorganisms can be safely and fully prevented by an additive effect of the ozone and ions. The generation of ozone is suppressed by reducing the discharge current in the ionization chamber using a pulse converter, which is provided to control the current flowing at the time of discharge, when generating the ions and ozone in the ionization chamber. Ions are produced in the ionization chamber in a high concentration to produce and supply ionized gas containing a low concentration of ozone and a high concentration of ions, which prevents microorganism multiplication on the objects.
    Type: Grant
    Filed: October 15, 1996
    Date of Patent: August 15, 2000
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yasuhiro Tanimura, Koji Ota, Takesi Sugimoto, Masao Kawasaki, Daisyuu Hirayama