Patents by Inventor James E. Johnstone

James E. Johnstone 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).

  • Well pumping
    Patent number: 5289884
    Abstract: Method and apparatus for sucker rod pumping in a wellbore using, in lieu of a stuffing box, first and second seal members connected by a length of compressible hose, the first seal member adapted to seal with the wellhead in a liquid and vapor tight manner and the second seal member adapted to seal with the sucker rod string in a liquid and vapor tight manner.
    Type: Grant
    Filed: March 22, 1993
    Date of Patent: March 1, 1994
    Assignee: Atlantic Richfield Company
    Inventor: James E. Johnstone