Patents by Inventor Motohiro Otawa

Motohiro Otawa 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).

  • Low-hydrogen coated electrode
    Patent number: 4251711
    Abstract: Coated electrode which can produce a weld metal showing good impact toughness and good COD values. This coated electrode comprises a carbon steel and a coating composition comprising 2 to 12% calculated as TiO.sub.2 of a titanium oxide, 0.2 to 8% of at least one selected from the group consisting of Ti, Al and Mg, 0.2 to 2% calculated as B.sub.2 O.sub.3 of a boron oxide or boron oxide compound, 40 to 60% of at least one selected from the group consisting of CaCO.sub.3, MgCO.sub.3 and BaCO.sub.3, 15 to 30% of at least one selected from the group consisting of CaF.sub.2, MgF.sub.2 and AlF.sub.3, 1 to 4.8% Si, 3 to 9% Mn, the balance being a slag forming agent, an arc stabilizing agent and a binder.
    Type: Grant
    Filed: February 23, 1979
    Date of Patent: February 17, 1981
    Assignee: Nippon Steel Corporation
    Inventors: Takashi Tanigaki, Takeshi Koshio, Motohiro Otawa