Patents by Inventor Joseph R. Mitchell

Joseph R. Mitchell 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).

  • Apparatus for introducing elements into molten metal streams and casting in inert atmosphere
    Patent number: 4391319
    Abstract: Aluminum pellets are ejected from the nozzle of an elongated tube into a stream of liquid steel flowing from a tundish into a continuous casting mold. Protective gas is utilized to propel the pellets of aluminum from the elongated tube into the molten stream. A special nozzle structure for the elongated tube insures that the aluminum pellets will properly impinge upon and mix with the molten stream. The elongated tube is retained within a larger cylindrical tube that directs low velocity, protective gas at the molten stream. The protective gas, such as nitrogen or argon, provides essentially nonreactive atmosphere that envelops the molten stream of steel.
    Type: Grant
    Filed: June 29, 1981
    Date of Patent: July 5, 1983
    Assignee: Keystone Consolidated Industries, Inc.
    Inventors: Lawrence J. Heaslip, Alphia L. Hohulin, Joseph R. Mitchell