Patents Assigned to Landell International Company, Inc.
  • Pipe coupling
    Patent number: 4770448
    Abstract: A pipe joint coupling member for deep well pipe strings has a female thread with a slightly longer pitch than the standard API thread of the pipe end. The differences in pitch is predetermined so as to equal the elastic elongation of the pipe end threads due to loading of the made up joints when suspended in a well. The coupling, in addition to having a slightly longer thread pitch may also have a different taper or tapers than that of the standard pipe end.
    Type: Grant
    Filed: September 12, 1986
    Date of Patent: September 13, 1988
    Assignee: Landell International Company, Inc.
    Inventors: Albert L. Strickland, William O'Dell
  • Oil well pump
    Patent number: 4720247
    Abstract: A oil well reciprocating piston pump is fluid pressure operated from a source at the earth's surface. The piston is hollow and serves also as a sealed cylinder for a free piston which is gas biased downwardly. The underside of the free piston is in contact with a body of oil displaceable from the sealed cylinder into the annular space between the hollow piston and its cylinder to bias the hollow piston toward the bottom of its stroke.
    Type: Grant
    Filed: November 14, 1986
    Date of Patent: January 19, 1988
    Assignee: Landell International Company, Inc.
    Inventors: Albert L. Strickland, William O'Dell