Patents by Inventor Johan Van Den Tol

Johan Van Den Tol 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).

  • Method for manufacturing a ready-to-use catch pit
    Patent number: 6601347
    Abstract: A method for making a catch-pit, such as the catch-pits often associated with underground pipeline junctions, manholes, or the like, where it is desirable to join a horizontal pipe with a larger-diameter, vertical, hollow, cylindrical works by means of a cottering or sleeve joint. The method includes the use of a removable profile component at the time the wall element of the pit or manhole is manufactured, to create a specially contoured opening in the wall to receive a correspondingly-shaped sleeve joint, which in turn receives the pipe.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: August 5, 2003
    Assignees: Waco-Liesbosch Beton B.V., Ubo Engineering B.V.
    Inventor: Johan Van Den Tol