Patents by Inventor Takahisa Naitoh

Takahisa Naitoh 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 of reproducing water-soluble cutting agents
    Patent number: 4358380
    Abstract: A method of recycling and purifying water-soluble cutting agents is disclosed. The used water-soluble cutting agent is recycled by filtering through an oil-water separating filter consisting of a porous sheet and an oil-water separating layer composed essentially of a water-insoluble and water absorbable gel layer, which is formed on a surface portion of the porous sheet and is adapted to be contacted with the cutting agent and/or surface portions of the porous sheet serving as flow path.
    Type: Grant
    Filed: March 25, 1981
    Date of Patent: November 9, 1982
    Assignees: Nissan Motor Co., Ltd., Maruchi Kohken Co., Ltd.
    Inventors: Masami Hasegawa, Utaro Sakai, Takahisa Naitoh