Patents by Inventor David E. Koehmstedt, Jr.

David E. Koehmstedt, Jr. 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).

  • Pipe pusher
    Patent number: 6206345
    Abstract: An apparatus for pushing tubular members along a tunnel, the apparatus comprising a frame shaped to receive a tubular member therein and having an open end shaped to receive the tubular member therethrough, and a pushing element mounted on and displaceable along the frame for engaging a tubular member within the frame and pushing the tubular member along the frame and through the open end. The apparatus further includes a drive motor mounted on the pushing element and engaging the frame, the drive motor displacing the pushing element along the frame relative to the open end.
    Type: Grant
    Filed: February 19, 1999
    Date of Patent: March 27, 2001
    Assignee: McNally Tunneling Corporation
    Inventors: Lawrence M. Lenahan, Bernam G. Fraley, Mark R. Kaletta, David E. Koehmstedt, Jr.