Patents by Inventor John A. L. Campbell

John A. L. Campbell 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).

  • Advance method and apparatus for mining
    Patent number: 4173373
    Abstract: A mine roof-bolter machine having an extensible conveyor running therethrough operates behind a continuous miner machine. As the continuous miner advances, the roof-bolter advances from position-to-position while installing roof bolts and plates, and the extensible conveyor gives and takes the slack between the continuous miner and the roof bolter and feeds mined material to a surge car behind the roof bolter.
    Type: Grant
    Filed: August 25, 1977
    Date of Patent: November 6, 1979
    Assignee: Peabody Coal Company, Inc.
    Inventors: John A. L. Campbell, Daniel J. Moynihan
  • Mining method and apparatus
    Patent number: 4102550
    Abstract: Connected support sections for a mineral face conveyor are individually supported on the forward sides of chocks which move in towards the rib of a panel behind a mining machine. Backfill is transported to the mined area behind the moved-up chocks via a conveyor supported from connected support sections on the rear sides of the chocks.
    Type: Grant
    Filed: April 20, 1976
    Date of Patent: July 25, 1978
    Assignee: Peabody Coal Company
    Inventors: John A. L. Campbell, Daniel J. Moynihan
  • Mining apparatus and method
    Patent number: 4082360
    Abstract: An articulated ancillary support for a conveyor is attached onto the forward side of a mine roof chock by extensible means which, when retracted towards the chock, shifts the ancillary support from a normal condition in which it occupies an area of relatively wide lateral extent to another condition in which it overlies an area of relatively narrow lateral extent, freeing a large portion of the space under the chocks to clear the way for a retreating continuous miner.
    Type: Grant
    Filed: June 23, 1976
    Date of Patent: April 4, 1978
    Assignee: Peabody Coal Company
    Inventors: John A. L. Campbell, Daniel J. Moynihan