Patents by Inventor Eric James Dunn

Eric James Dunn 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).

  • Mining machines
    Patent number: 4106815
    Abstract: A mining machine adapted to be driven forwardly towards a working face comprises one or more cutting booms projecting forwardly from the machine, a cutting tool mounted on the forward end of the or each boom, and a drive mechanism for rotating the cutting tool relative to the boom, the said mechanism including a multi-speed gearbox whereby the cutting tool may be selectively driven at two or more different cutting speeds.
    Type: Grant
    Filed: November 5, 1976
    Date of Patent: August 15, 1978
    Assignee: Dosco Overseas Engineering Limited
    Inventor: Eric James Dunn