Patents by Inventor Leroy C. Donnally

Leroy C. Donnally 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).

  • Vacuum assisted transfer mold and vent pin
    Patent number: 4874308
    Abstract: The mold described has walls disposed about the mold plates and vent pin retainer plates to permit a vacuum to be generated. The vent pins have been designed to be self cleaning. A pin having a generally cylindrical shape is used. A first portion of the pin has a face defined by a chord of the cylinder. The face leaves a small space between the pin and the opening wall which permits the atmosphere to be removed from the cavity. Below the first portion is a second portion, smaller in diameter than the first portion. Below the second portion is a third portion of essentially the same design as the first portion rotated 45.degree.. This portion cleans the walls of the opening when the pin is raised to eject the parts.
    Type: Grant
    Filed: April 4, 1988
    Date of Patent: October 17, 1989
    Inventors: George N. Atlas, Leroy C. Donnally, Donald P. Urban, James M. Perkins, Timothy C. Wilson