Patents by Inventor George A. Dunham

George A. Dunham 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).

  • Auger type mining machine
    Patent number: 3980342
    Abstract: An auger type mining machine in which the rotational torque necessary to do the mining is supplied separately and independently from the force required to advance the auger, and is provided by a motor having a stator portion insulated from, secured to and contained within a casing and disposed in concentric relation to the auger, and a rotor portion of the motor insulated from and attached to an inner drive member which is also disposed circumferentially about the auger in driven relationship to the stator portion of the motor.
    Type: Grant
    Filed: April 9, 1975
    Date of Patent: September 14, 1976
    Inventor: George A. Dunham