Patents by Inventor L. Keith Campbell

L. Keith 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).

  • High density plastic tubing with included power transmission cabling for downhole use in petroleum industry
    Publication number: 20040113734
    Abstract: The present invention relates generally to provision of electrical power downhole to power tools such as pumps, valves, motor-driven drilling tools, grapples and the like. More particularly, the present invention relates to the provision of electrical power through cables included within the walls of high density plastic tubing used in completion or production techniques in some oil and gas production settings, commonly referred to as “coiled” or “endless” tubing.
    Type: Application
    Filed: November 12, 2003
    Publication date: June 17, 2004
    Inventor: L. Keith Campbell