Patents Assigned to Softal Electronic
  • Method and device for surface treatment with a plasma at atmospheric pressure
    Patent number: 6299948
    Abstract: Method for creating an electric discharge in an initial gas which is at atmospheric pressure and lies between two exciting electrodes, comprising applying a supply voltage to the two electrodes which is an AC voltage whose amplitude and frequency are adapted in order to maintain (1) at least a portion of the components of the gas in the excited state, and/or (2) the presence of electrons, between two successive half-cycles of the supply voltage.
    Type: Grant
    Filed: April 9, 1999
    Date of Patent: October 9, 2001
    Assignees: L'Air Liquide, Societe Anonyme pour l'Etude et l'Exploitation des Procedes Georges Claude, Softal Electronic
    Inventors: Nicolas Gherardi, Gamal Gouda, Françoise Massines, Alain Villermet, Eric Gat