Patents by Inventor Jean-Francois Trefouel

Jean-Francois Trefouel 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).

  • Railroad vehicle for measuring the geometrical parameters of railroad track
    Patent number: 5203089
    Abstract: The invention relates to a railroad vehicle for measuring the parameters of a railroad track, characterized by the presence of third axles (13 and 23) with independent wheels and disposed between the main axles (11 and 12; 21 and 22) of the bogies (10 and 20) of the vehicle, and by the existence of a third bogie (30) having two axles (31 and 32) capable of undergoing relative angular displacement about a line passing through their centers, said third bogie (30) also having a third axle (39) with having independent wheels; the measurements are made by means of optical proximity meters and distance gauges.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: April 20, 1993
    Assignees: Cegelec, Ateliers Bretons de Realisations Ferroviaires
    Inventors: Jean-Francois Trefouel, Marc Centil