Patents by Inventor Yasuji Shimizu

Yasuji Shimizu 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).

  • Water treatment process with ozone
    Patent number: 5492633
    Abstract: A process for the treatment of water with ozone in which trace amounts of organic substances contained in water to be treated are oxidized and decomposed by diffusing ozone into the water introduced into a reaction tank, by injecting a chelate compound into the water to be treated after or just before the introduction of the water into the reaction tank. Preferred chelate compounds include ethylenediaminetetraacetic acid disodium salt, ethylenediaminetetraacetic acid calcium salt, ethylenediaminetetraacetic acid magnesium salt, ethylenediaminetetraacetic acid iron salt and iron citrate.
    Type: Grant
    Filed: March 27, 1995
    Date of Patent: February 20, 1996
    Assignee: Fuji Electric Co., Ltd.
    Inventors: Takeo Moniwa, Mitsumasa Okada, Nobuyuki Motoyama, Takayuki Morioka, Yasuji Shimizu, Ryutaro Takahashi