Patents by Inventor Francis Legrand

Francis Legrand 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).

  • Equipment for storage of energy under kinetic form and recovery thereof in electric form and method of using such equipment
    Patent number: 4444444
    Abstract: An uninterruptible electric power source comprising a rotor and a stator with the stator having a magnetically suspended flywheel with magnet rings for radial centering, a double electromagnet in a servoloop for restoring equilibrium including a rate sensor and lift-off logic in the servoloop encased in an evacuated vacuum enclosure. Variation in the structure of elements including the enclosure are described.
    Type: Grant
    Filed: October 19, 1981
    Date of Patent: April 24, 1984
    Assignee: Societe Nationale Industrielle Aerospatiale
    Inventors: Alain Benedetti, Luc Laury, Francis Legrand, Pierre Poubeau, Bernard Weisser
  • Method and integrated system for the torque control and energy storage for a space vehicle
    Patent number: 4188666
    Abstract: The energy storage is effected kinetically. The system includes a first feedback loop with a time constant .tau.1 including a regulator connecting the supply busbar to a device for controlling momentum wheels used for the kinetic energy storage and the torque control. A second feedback loop, of time constant .tau.2, transmits velocity data .omega. from the momentum wheels to a processing unit, constituted by a microprocessor, which controls the wheel actuating device. A third feedback loop, of time constant .tau.3, supplies the processing unit with the data regarding the torque required by the satellite piloting device.
    Type: Grant
    Filed: May 22, 1978
    Date of Patent: February 12, 1980
    Assignee: Societe Nationale Industrielle et Aerospatiale
    Inventors: Francis Legrand, Bernard Weisser
  • Method and apparatus for steering a spacecraft and regulating its onboard supply voltage
    Patent number: 4164018
    Abstract: The invention relates generally to a method of regulating the onboard voltage of a spacecraft and of steering the same by at least two contrarotating motor-generator dynamoelectrical machines.According to said method, there are provided two phases:The energy storage mode, during which each machine receives electrical energy from solar generators through a velocity controlling generator commanded from a synthesis of the data relating to position and rotor velocity;The energy restitution mode, during which each generator supplies energy to a load consisting of the onboard equipment of the satellite. Output monitoring systems effect a synthesis of the data relating to position rotor velocity and additionally control the power switches.
    Type: Grant
    Filed: April 14, 1977
    Date of Patent: August 7, 1979
    Assignee: Societe Nationale Industrielle Aerospatiale
    Inventor: Francis Legrand
  • Synthetic musk-based composition, its production and applications
    Patent number: 4162221
    Abstract: The composition based on nitrated synthetic musk, contains about 0.5 to 50% y weight with respect to the total composition, of a modifying agent, the complement to 100% being constituted by the nitrated synthetic musk. The modifying agent is a solid non-filmformer, at least partially soluble in lower alcohols and being in addition odorless and non-toxic or non-irritant in contact with human tissue. It is specially useful in the perfumery, washing materials and detergent industries.
    Type: Grant
    Filed: January 27, 1978
    Date of Patent: July 24, 1979
    Assignee: Societe des Produits Chimiques et Matieres Colorantes de Mulhouse
    Inventors: Louis Durr, Francis Legrand