Patents by Inventor Derek Alford

Derek Alford 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 machine steering equipment
    Patent number: 4371209
    Abstract: A mining machine comprising a ranging drum having two operational positions adjacent to the mine roof and to the mine floor, respectively, is provided with machine steering equipment comprising a component having two operational modes associated with the two operational positions of the cutter head, respectively, actuator means for urging the component into one or other of the two operational modes, and sensor means for sensing the position of the component and for deriving a signal indicative of the sensed component position.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: February 1, 1983
    Assignee: Coal Industry (Patents) Limited
    Inventors: Derek Alford, Alan Wilkinson