Patents Assigned to Production Monitoring and Control Co.
  • Polish rod temperature sensing system and rod stroking control
    Patent number: 4672845
    Abstract: A well polish rod temperature sensing system, for use at a well head, comprising(a) first sensor located in proximity to the polish rod to sense its temperatures T.sub.1,(b) second sensor for sensing temperature T.sub.2 of the environment near the well head,(c) and circuitry operatively connected to the first and second sensor to provide an output signal which is a function of the difference between T.sub.1 and T.sub.2.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: June 16, 1987
    Assignee: Production Monitoring and Control Co.
    Inventors: Michael Hirsch, Peter D. Kristensen, William W. Dunn