Patents Assigned to Nujack Oil Pump Corporation
  • Method for pumping a liquid from a well and apparatus for use therein
    Patent number: 4545737
    Abstract: A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings imposed upon the sucker rod at either extremity of its motion in conventional pumping methods. Hydraulically and mechanically-driven apparatus is disclosed for carrying out the method.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: October 8, 1985
    Assignee: Nujack Oil Pump Corporation
    Inventor: George E. Stanton
  • Method for pumping a liquid from a well and apparatus for use
    Patent number: 4526048
    Abstract: A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings imposed upon the sucker rod at either extremity of its motion in conventional pumping methods. Hydraulically and mechanically-driven apparatus is disclosed for carrying out the method.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: July 2, 1985
    Assignee: Nujack Oil Pump Corporation
    Inventor: George E. Stanton
  • Method for pumping a liquid from a well and apparatus for use therein
    Patent number: 4456060
    Abstract: A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings imposed upon the sucker rod at either extremity of its motion in conventional pumping methods. Hydraulically and mechanically-driven apparatus is disclosed for carrying out the method.
    Type: Grant
    Filed: August 11, 1982
    Date of Patent: June 26, 1984
    Assignee: Nujack Oil Pump Corporation
    Inventor: George E. Stanton
  • Method for pumping a liquid from a well and apparatus for use therein
    Patent number: 4406597
    Abstract: A pumping method, principally for oil, allows the sucker rod to fall under gravity for the first part of the downward stroke, then decelerates the sucker rod to a slow rate of descent, so creating a pause in the sucker rod's motion. Shock-absorbing means are provided to eliminate the impulsive loadings imposed upon the sucker rod at either extremity of its motion in conventional pumping methods. Hydraulically and mechanically-driven apparatus is disclosed for carrying out the method.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: September 27, 1983
    Assignee: Nujack Oil Pump Corporation
    Inventor: George E. Stanton