Patents by Inventor Charles E. Dotson

Charles E. Dotson 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 for determining true fracture pressure
    Patent number: 4577689
    Abstract: A method for determining true fracture pressure of earth formations disposed below a liner or casing cemented in place comprising the location of an elastomer sealing element cemented in place against the borehole wall at the bottom of the liner or casing and just above the casing shoe so as to prevent annular migration of liquids in the seal interface with the earth formations and to permit true fracture pressure of the formations to be determined.
    Type: Grant
    Filed: August 24, 1984
    Date of Patent: March 25, 1986
    Assignee: Completion Tool Company
    Inventor: Charles E. Dotson