Patents by Inventor Gian Luigi Trevisnani

Gian Luigi Trevisnani 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).

  • Telescopic bar of drill rig
    Patent number: 5184688
    Abstract: A telesciopic bar of drill rig for drilling in general, where the telescopic sections (10, 11, 12) consist of concentric, substantially cylindrical pipes, each of them equipped with longitudinal internal (16,17) and external (13,14) toothed ribs arranged in such a way that the external rib of each pipe and the internal one of the external pipe are engaged when the bar is being rotated to lock the telescopic sections in position, and released when the bar is being rotated in the opposite direction to lift and withdraw the bar sections.
    Type: Grant
    Filed: April 1, 1991
    Date of Patent: February 9, 1993
    Assignee: International Foundations Constructions Ltd.
    Inventor: Gian Luigi Trevisnani