Patents by Inventor Keiji Ohki

Keiji Ohki 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).

  • Method for preventing obstruction in aluminum brass pipes in a water flow path
    Patent number: 6106770
    Abstract: A method for preventing obstruction in aluminum brass pipes in a water flow path, including the steps of continuously supplying iron ions or an iron ion supply compound to water in the water flow path in such a manner that a concentration of iron ions in the water is 0.005 to 0.05 mg/liter, and supplying hydrogen peroxide or a hydrogen peroxide supply compound for a period of time sufficient for preventing adhesion of organisms to the aluminum brass pipes but not impeditive to formation of corrosion-resistant coating inside the pipes, in such a manner that a concentration of hydrogen peroxide in the water is 0.1 to 1.5 mg/liter, whereby corrosion of aluminum brass pipes and adhesion of organisms to the pipes are prevented.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: August 22, 2000
    Assignees: Mitsubishi Gas Chemical Company Inc., Katayama Chemical Inc.
    Inventors: Keiji Ohki, Kunio Nishimura, Yoshiharu Wakao