Patents Assigned to John Campbell
  • Casting process with forced and controlled vortex at sprue intake
    Patent number: 5526868
    Abstract: A casting process with a forced and controlled vortex at sprue intake comprising imposing rotating motion to molten metal in a pouring basin on a casting mold to create a vortex of molten metal while introducing the molten metal into a cavity, and causing the vortex of molten metal to flow into a sprue along an inner wall thereof so as to create a central vortex core in the molten metal in the sprue while the molten metal is being poured into the sprue.
    Type: Grant
    Filed: February 4, 1994
    Date of Patent: June 18, 1996
    Assignees: John Campbell, NKK Corporation
    Inventors: John Campbell, Tomoo Isawa
  • Combined liquid container and cap
    Patent number: D397039
    Type: Grant
    Filed: August 16, 1995
    Date of Patent: August 18, 1998
    Assignees: James Dickson, John Campbell, William Robertson, Gilmour Cuthbertson
    Inventors: James Michael Francis Dickson, John Muir Campbell