Patents Assigned to Ex-L-Tube, Inc.
  • Pipe connection
    Patent number: 6435569
    Abstract: A pipe connecting structure incorporated in the male and female ends of the pipes rigidly secures pipes in sealed end-to-end relation. Each end has axially spaced tapered cylindrical surfaces with a continuous thread extended between the surfaces. Each thread has an axially inward directed leading wall extended from an annular inner wall to an annular outer wall. A radial trailing wall at the rear of the outer wall extends inwardly to the inner wall. The grooves between the threads have the same profile as the threads.
    Type: Grant
    Filed: November 27, 1998
    Date of Patent: August 20, 2002
    Assignee: Ex-L-Tube, Inc.
    Inventor: Howard C. Hopkins