Patents by Inventor Michio Uemura

Michio Uemura 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).

  • Drilling fluid additives
    Patent number: 4572789
    Abstract: A drilling fluid additive comprising a complex compound or complex compounds, at least one compound to be selected out of a group of compounds of titanium, zirconium and hafnium belonging to group IVb of the periodic table and, as desired, at least one lignin ensures, for a long period, significantly improved mud functions even at elevated temperatures under high pressure such as encountered in the depths of the earth.
    Type: Grant
    Filed: March 23, 1984
    Date of Patent: February 25, 1986
    Assignee: Japan Metals and Chemicals Co., Ltd.
    Inventors: Michio Uemura, Yutaka Sato, Masaru Nakamura, Toyoshi Iida