Patents Examined by Kirsten Crockford Jorsley
  • Method of lining underground pipes and apparatus for performing the method
    Patent number: 6632475
    Abstract: A method of creating a self-supporting waterproof lining in an underground pipe involves pulling a small carriage through the pipe and operating a rotary sprayer mounted on the carrier to spray an air-atomized, fast-setting organic compound on the interior of the pipe. Supply lines for air and the two parts of the compound pass through a union from the non-rotary carriage to the rotary sprayer.
    Type: Grant
    Filed: June 19, 2001
    Date of Patent: October 14, 2003
    Inventor: Nicola Bleggi