Patents by Inventor Douglas W. Elliott

Douglas W. Elliott 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).

  • Encapsulated radioactive tracer
    Patent number: 5929437
    Abstract: Radioactive particles are provided for use in tracing the flow path in or near a well of fluids injected into the well. The particles include an element which can be made radioactive by bombardment with neutrons and a material to encapsulate the element. The encapsulant is preferably an organic polymer having a high softening temperature. The particles may be injected into a well in treating fluids and their location may be later determined by gamma ray logging of the well.
    Type: Grant
    Filed: May 20, 1997
    Date of Patent: July 27, 1999
    Assignee: Protechnics International, Inc.
    Inventors: Douglas W. Elliott, David L. Holcomb