Patents by Inventor Ralph J. Harker

Ralph J. Harker 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).

  • Mechanism for compacting material
    Patent number: 4069929
    Abstract: A material handling apparatus having a storage body, a hopper communicating with it through material compacting or crushing means in which said means comprises a cylindrical roller and a substantially planar material-holding tray capable of movement beneath said cylinder in material compacting relationship therewith.
    Type: Grant
    Filed: May 21, 1976
    Date of Patent: January 24, 1978
    Assignee: Wisconsin Alumni Research Foundation
    Inventor: Ralph J. Harker