Patents by Inventor Robert G. Dillingham

Robert G. Dillingham 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).

  • Tunnel boring machine
    Patent number: 4349230
    Abstract: In a tunneling machine including a hollow shield, a non-rotatable outer housing mounted in the shield for longitudinal movement, and inner housing rotatably mounted within the outer housing, an excavator including a boom and bucket pivotally mounted on the forward end of the inner housing, and a boom cylinder having a forward portion pivotally engaged with the boom and a rear portion mounted at the rearward portion of the inner housing.
    Type: Grant
    Filed: August 10, 1979
    Date of Patent: September 14, 1982
    Assignee: Zokor Corporation
    Inventors: Herman Hamburger, Robert G. Dillingham