Patents Assigned to Ben N. McDonald
  • Removable closure for an opening in an aluminum refining pot
    Patent number: 5667648
    Abstract: A closure is made of a flexible fabric material designed to withstand a temperature in the range of 1800.degree. F. as is present within a pot employed to conduct the Hall-Heroult process for deriving aluminum from alumina. The closure, in a preferred embodiment, includes an elongated hook allowing it to be hung over the opening of the pot and also includes a gripping handle allowing the closure to be manipulated. A peripheral bulbous seal enhances the sealing effect about the opening in the pot.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: September 16, 1997
    Assignees: Michael J. McDonald, Ben N. McDonald
    Inventor: James Barrett McDonald