Patents by Inventor Dennis M. Spriggs

Dennis M. Spriggs 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).

  • Apparatus and method of well preparation for chemical treatment of produced fluids
    Patent number: 4637469
    Abstract: An apparatus for chemical treatment of a fluid pumped from a well through a production tubing includes a tubing anchor with slips adapted to be set hydraulically and mechanically against the casing in the well without rotating the production tubing. A branch line from a chemical injection line communicates with a setting pressure chamber in the anchor which, when pressurized, is used to initially set the slips. Thereafter, a straight pull on the tubing mechanically completes setting of the slips and a plug blocking the injection line is removed enabling the delivery of a treatment chemical to the well fluid upstream of a pump utilized in removing the fluid in the well.
    Type: Grant
    Filed: August 6, 1984
    Date of Patent: January 20, 1987
    Assignee: Dresser Industries, Inc.
    Inventors: Dennis M. Spriggs, Jody R. McGlothen
  • Single string retrievable well packers
    Patent number: 4151876
    Abstract: A single string well packer having a pair of unitary tubular gripping members is disclosed which can be set by wireline, hydraulic pressure, or mechanically or tubing string.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: May 1, 1979
    Assignee: Dresser Industries, Inc.
    Inventors: Wayne S. Briggs, Dennis M. Spriggs, Stanley A. Weise