Patents by Inventor Donnie D. Rhum

Donnie D. Rhum 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).

  • Melt pumping apparatus and casting apparatus
    Patent number: 5454423
    Abstract: Apparatus for supplying melt from a melt-holding vessel to a casting machine comprises a ceramic melt pump casing or housing submersible in the melt. The casing includes a melt-pumping chamber with a melt inlet and melt outlet and a piston-receiving bore communicated to the chamber. A piston having a ceramic pumping portion is movable in the bore relative to the chamber in a suction stroke to draw the melt into the chamber through the melt inlet and in a pumping stroke to discharge the melt from the chamber through the melt outlet to, for example, a melt casting machine. A melt inlet valve having a ceramic valve portion submersible in the melt is movable relative to the melt inlet to open/close the melt inlet when the piston pumping portion is moved in the respective suction/pumping stroke.
    Type: Grant
    Filed: June 30, 1993
    Date of Patent: October 3, 1995
    Assignees: Kubota Corporation, General Motors Corporation
    Inventors: Jiro Tsuchida, Hirotaka Tsubota, Hiroshi Yamaguchi, Donnie D. Rhum
  • Mounting expendable core in die cast die
    Patent number: 5392841
    Abstract: An expendable core is positioned in the molding cavity of a die casting die including hollow mounting pins affixed to the die which mate with recesses formed in the expendable core. Vacuum applied to the recesses through the hollow mounting pins anchors the core in the die cavity.
    Type: Grant
    Filed: June 10, 1994
    Date of Patent: February 28, 1995
    Assignee: General Motors Corporation
    Inventors: Stuart W. Anderson, Bradley C. Menaugh, Donnie D. Rhum