Patents by Inventor Jean-Charles Vidal

Jean-Charles Vidal 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).

  • Magnetic process for determining a trajectory for finding a magnetic object and apparatus for performing the process
    Patent number: 4885536
    Abstract: Magnetic process for determining the trajectory of a moving vehicle for finding a fixed or moving magnetic object and apparatus for performing the process.The apparatus comprises magnetometers for measuring at least p independent components of the gradient of the local magnetic field, in which p is an integer equal to the number of dimensions of the space in which the moving vehicle is displaced, a circuit for storing a scalar criterion which is a function of at least one of the components of the measured gradient, a circuit for calculating the direction (.theta., .psi.) maximizing the criterion as a function of the measured gradient and a display, for use in guiding the vehicle.
    Type: Grant
    Filed: January 22, 1988
    Date of Patent: December 5, 1989
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Roland Blanpain, Patrick Le Masson, Jean-Charles Vidal
  • Device for automatically compensating the magnetism of drill string members
    Patent number: 4649349
    Abstract: Each end of the rods surrounding the positioning sensor is provided with a coil, through which passes a current, whose intensity is automatically regulated as a function of the sensor readings in order to make the gradient of the magnetic field due to the rods and to the field itself zero within the sensor area.
    Type: Grant
    Filed: March 1, 1984
    Date of Patent: March 10, 1987
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Guy Chiron, Jean-Charles Vidal