Patents Assigned to Thread Technology International, Inc.
  • Threaded pipe connection
    Patent number: 4588213
    Abstract: In the preferred embodiment, this invention provides a threaded pipe coupling for connection with a conventional threaded pipe end so as to effect improved sealing against internal fluid pressure and against external fluid pressure as may be required in an oil or gas well. The coupling form causes the thread contact pressure to be greater at the maximum and minimum thread contact diameters than exists at intermediate points along the length of thread contact. An auxiliary plastic seal that will undergo thermal cycling is also provided.
    Type: Grant
    Filed: October 5, 1983
    Date of Patent: May 13, 1986
    Assignee: Thread Technology International, Inc.
    Inventors: Charles A. Bollfrass, Kenneth D. Chelette