Patents by Inventor John R. Wolfenden

John R. Wolfenden 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).

  • Steering of mining machines
    Patent number: 4643482
    Abstract: A double-ended ranging drum shearer is steered along a longwall face by using a series of spaced reference locations A, B, C, D, E, F, G, H. I . . . . The machine position is sensed so as to identify when the leading and trailing drum reach each desired reference location. The cutting horizon of each drum is sensed at each reference location and steering corrections applied if necessary.
    Type: Grant
    Filed: June 21, 1984
    Date of Patent: February 17, 1987
    Assignee: Coal Industry (Patents) Limited
    Inventor: John R. Wolfenden