Patents Examined by David John Bartczak
  • Internal expansion coupling device
    Patent number: 5002317
    Abstract: This invention relates to an internal expansion coupling device for forming a T-joint between essentially perpendicularly disposed tubular members, where one of the tubular member is provided with a circular wall opening aligned with an open end of the other tubular member, and said circular wall opening includes an elastomeric collar thereabout.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: March 26, 1991
    Inventor: John W. Burkit