Patents by Inventor Derry R. Thompson

Derry R. Thompson 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).

  • Kelly drive bushing adapter
    Patent number: 4317493
    Abstract: An adapter is provided for positioning a kelly drive bushing of a surface drilling assembly in spaced relationship to an associated rotary table. The adapter permits the wireline of an electronic steering assembly to pass through the central aperture in the rotary table below the drive bushing to surface readout equipment, enabling the electronic steering assembly to be employed for drilling directional bores without removal of the kelly.
    Type: Grant
    Filed: January 4, 1980
    Date of Patent: March 2, 1982
    Inventor: Derry R. Thompson