Patents by Inventor Guillaume Ravel

Guillaume Ravel 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).

  • METHOD OF MANUFACTURING AN OPTICAL ELEMENT FROM SILICA OR GLASS
    Publication number: 20080299302
    Abstract: The invention concerns a method of manufacturing an optical element made from silica, characterised in that it comprises at least one step of depositing silica on at least one face of the optical element. The invention applies more particularly to the manufacture of phase plates.
    Type: Application
    Filed: May 30, 2008
    Publication date: December 4, 2008
    Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE
    Inventor: Guillaume RAVEL
  • Process and apparatus for determining the impedance of the discharge in a plasma reactor system comprising a tuning box and application to the regulation of the impedance or the ionic current in such reactor
    Patent number: 4990859
    Abstract: A method and apparatus for determining the impedance of the discharge in a plasma reactor system comprising a tuning box having variable capacitors is described. The impedance of the discharge is determined in dependence on a pre-established relationship between the operational positions of the variable capacitors on the one hand and the impedance of the discharge on the other. The ionic current relative to the discharge in the reactor also may be determined by taking into account the high frequency voltage of the reactor.
    Type: Grant
    Filed: June 23, 1989
    Date of Patent: February 5, 1991
    Assignee: Commissariat a l'Energie Atomique
    Inventors: Bernard Bouyer, Bernard Andries, Guillaume Ravel, Louise Peccoud