Patents by Inventor Jean-Jacques Derksema

Jean-Jacques Derksema 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).

  • Drive device for applying a magnetic pulse to a mechanical assembly and aircraft load ejection device implementing same
    Patent number: 8619403
    Abstract: This device comprises an electromagnetic coil (3) in which there is able to slide a piston (6) which has at least a portion made of a material having paramagnetic susceptibility and which is placed in contact with the mechanical member when the drive device (1) is in the rest state. Electrical energy supply means are provided in order to store electrical energy and to abruptly release this energy into the coil and thus apply the high-energy magnetic movement pulse to the mechanical member. According to the invention, the piston (1) comprises a stack (9) of blocks (11, 12) which are made alternately from the material having paramagnetic susceptibility and an insulating material; and the electrical energy supply means are provided in order to allow the energy to be applied to the coil in the form of a series of electrical pulses which appear as the piston (6) moves.
    Type: Grant
    Filed: August 22, 2008
    Date of Patent: December 31, 2013
    Assignees: Alkan, Institut Franco-Allemand de Recherches de Saint-Louis
    Inventors: Jean-Jacques Derksema, Klaus Sterzelmeier
  • DRIVE DEVICE FOR APPLYING A MAGNETIC PULSE TO A MECHANICAL ASSEMBLY AND AIRCRAFT LOAD EJECTION DEVICE IMPLEMENTING SAME
    Publication number: 20110284695
    Abstract: This device comprises an electromagnetic coil (3) in which there is able to slide a piston (6) which has at least a portion made of a material having paramagnetic susceptibility and which is placed in contact with the mechanical member when the drive device (1) is in the rest state. Electrical energy supply means are provided in order to store electrical energy and to abruptly release this energy into the coil and thus apply the high-energy magnetic movement pulse to the mechanical member. According to the invention, the piston (1) comprises a stack (9) of blocks (11, 12) which are made alternately from the material having paramagnetic susceptibility and an insulating material; and the electrical energy supply means are provided in order to allow the energy to be applied to the coil in the form of a series of electrical pulses which appear as the piston (6) moves.
    Type: Application
    Filed: August 22, 2008
    Publication date: November 24, 2011
    Applicants: INSTITUT FRANCO-ALLEMAND de RECHERCHES de SAINT-LOUIS, ALKAN
    Inventors: Jean-Jacques Derksema, Klaus Sterzelmeier