Patents Represented by Attorney R. W. MacDonald

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  • 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
  • Method for loading of uranyl ion complexes on ion exchange resin
    Patent number: 4339414
    Abstract: The present invention relates to an improved method for removing uranyl ion complexes from a pregnant alkaline leach solution. More particularly, it relates to an improved method for removing uranyl ion carbonato complexes from a pregnant alkaline leach solution with an ion exchange resin which comprises adding carbon dioxide to the solution prior to removing the uranyl ion complexes.
    Type: Grant
    Filed: August 30, 1978
    Date of Patent: July 13, 1982
    Assignee: Atlantic Richfield Company
    Inventor: Thomas F. Moore