Patents by Inventor Tae-Joo Kweon

Tae-Joo Kweon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Liner for branch pipe of old repaired pipe and lining system and method for such liner
    Patent number: 6651699
    Abstract: A liner for a branch pipe of an old repaired pipe lined with a polyethylene liner, the liner comprising: a branch pipe portion made of a tubular body, the branch pipe portion being insertable into an existing branch pipe branching from the old repaired pipe; a welding plate provided at a first end of the branch pipe portion, the welding plate having a top surface to be welded to an inner surface of the polyethylene liner and being formed to have a curvature corresponding the an inner surface of the old repaired pipe; at least one O-ring attached tightly to an outer circumferential surface of a second end of the branch pipe portion; an expandable pressing ring for pressing against an inner surface portion of the second end of the branch pipe portion adjacent to the O-ring to force the O-ring to form a watertight seal against the existing branch pipe; an expanding key for holding the pressing ring in an expanded position to maintain the pressure of the pressing ring against the second end of the branch pipe por
    Type: Grant
    Filed: December 6, 2002
    Date of Patent: November 25, 2003
    Inventor: Tae-Joo Kweon
  • Liner for branch pipe of old repaired pipe and lining system and method for such liner
    Publication number: 20030106601
    Abstract: A liner for a branch pipe of an old repaired pipe lined with a polyethylene liner, the liner comprising: a branch pipe portion made of a tubular body, the branch pipe portion being insertable into an existing branch pipe branching from the old repaired pipe; a welding plate provided at a first end of the branch pipe portion, the welding plate having a top surface to be welded to an inner surface of the polyethylene liner and being formed to have a curvature corresponding the an inner surface of the old repaired pipe; at least one O-ring attached tightly to an outer circumferential surface of a second end of the branch pipe portion; an expandable pressing ring for pressing against an inner surface portion of the second end of the branch pipe portion adjacent to the O-ring to force the O-ring to form a watertight seal against the existing branch pipe; an expanding key for holding the pressing ring in an expanded position to maintain the pressure of the pressing ring against the second end of the branch pipe por
    Type: Application
    Filed: December 6, 2002
    Publication date: June 12, 2003
    Inventor: Tae-Joo Kweon