Patents by Inventor John N. Willis

John N. Willis 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).

  • Core box
    Patent number: 4159032
    Abstract: A core box having a core pattern and a self-contained mechanism for physically contacting a core, disposed within the pattern, and forcibly ejecting it from the pattern. The mechanism comprises a plurality of ejector pins which are movable into contact with the core by an inflatable bag disposed in the core box.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: June 26, 1979
    Assignee: Midland-Ross Corporation
    Inventors: Vaughn W. Makary, Barry E. Miller, John N. Willis