Patents Assigned to Robert E. Campbell
  • Method and apparatus for casting hollow ingot molds
    Patent number: 3995677
    Abstract: An ingot mold has been devised which instead of utilizing a full protective thickness or section of sand within the spacing between a metal core bar and a metal flask, employs a refractory lining for the flask and a refractory coat for the bar that respectively have a cross extent or thickness that occupies a greater portion of the spacing than the casting sand. The casting sand is utilized as a minimum inner thickness to define the casting mold and as imposed between the refractory lining and coat.
    Type: Grant
    Filed: November 26, 1975
    Date of Patent: December 7, 1976
    Assignees: Thomas S. Campbell, Robert E. Campbell
    Inventor: T. Bruce Campbell