Patents Assigned to Concoyle Oil Fields Tools, Inc.
  • Stop for an oil well swabbing device
    Patent number: 5148867
    Abstract: A stop for an oil well swabbing device which is economical to use, is readily positioned in the well casing at the desired level, and is readily removable with a conventional fishing tool.
    Type: Grant
    Filed: June 17, 1991
    Date of Patent: September 22, 1992
    Assignee: Concoyle Oil Fields Tools, Inc.
    Inventor: Gary W. Coyle