Patents by Inventor Daniel Kadjar

Daniel Kadjar 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).

  • Stabilizer sleeve for drill string
    Patent number: 4823891
    Abstract: A drill string stabilizer includes a cylindrical sleeve 11 coaxially surrounding a central tubular element 10 and fixed thereto by a plurality of helical blades 17 extending between the facing surfaces of the sleeve and the element. Converging truncated cones 13, 16 are provided on both ends of the sleeve. The upwardly flowing drilling mud establishes an annular fluid bearing between the sleeve and the borehole, while the helical blades implement a pumping function to enhance the discharge of the mud and cuttings.
    Type: Grant
    Filed: August 27, 1987
    Date of Patent: April 25, 1989
    Assignee: TOTAL Compagnie Francaise des Petroles
    Inventors: Noureddine Hommani, Daniel Kadjar