Patents by Inventor Gary L. Catchen

Gary L. Catchen 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).

  • Method of energy resolved gamma-ray logging
    Patent number: 4493999
    Abstract: A radioactive logging method for evaluating a wellbore and its surrounding formation in which gamma-ray emitting nuclides may be naturally present. A radioactive tracer is injected into the formation. The tracer emits gamma rays at at least one energy at which substantially none of the naturally present elements emit gamma rays. The wellbore is traversed with a gamma-ray detection system which is tuned to detect gamma rays at the one energy level of the tracer, thus providing a profile of tracer distribution in the formation.
    Type: Grant
    Filed: December 10, 1981
    Date of Patent: January 15, 1985
    Assignee: Conoco Inc.
    Inventor: Gary L. Catchen