Patents by Inventor Helene Ardelean

Helene Ardelean 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).

  • Composition and method for treating magnesium alloys
    Patent number: 7156905
    Abstract: The invention relates to a composition and method for treating a magnesium alloy. The inventive composition comprises an acid aqueous solution containing niobium pentoxide, a water-soluble cerium salt and, optionally, a zirconium salt and/or hydroflouric acid. Said method consists in submerging a magnesium alloy part in said composition. The invention can be used to protect magnesium alloy parts against corrosion.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: January 2, 2007
    Assignee: Universite Pierre & Marie Curie
    Inventors: Hélène Ardelean, Philippe Marcus
  • Compositions for the treatment of magnesium alloys
    Patent number: 7094327
    Abstract: The invention relates to a composition for treating magnesium alloys aimed at improving the resistance thereof to corrosion. The composition is an aqueous solution with a pH ranging between 7 and 10, containing a niobium salt, hydrofluoric acid, and optionally a zirconium salt, phosphoric acid, and boric acid. The alloy is treated in an electrochemical cell in which said alloy acts as an anode. The cell contains an inventive composition at a temperature between 20° C. and 40° C. as an electrolyte. An initial voltage which is sufficient to create a current density between 1.5 and 2.5 A/dm2 is applied to the cell, whereupon the voltage is progressively increased to a level ranging between 240 and 330 V in order to maintain the initial current density.
    Type: Grant
    Filed: January 31, 2003
    Date of Patent: August 22, 2006
    Assignee: Univeriste Pierre et Marie Curie
    Inventors: Hélène Ardelean, Philippe Marcus
  • Compositions for the treatment of magnesium alloys
    Publication number: 20050072685
    Abstract: The invention relates to a composition for treating magnesium alloys aimed at improving the resistance thereof to corrosion. The composition is an aqueous solution with a pH ranging between 7 and 10, containing a niobium salt, hydrofluoric acid, and optionally a zirconium salt, phosphoric acid, and boric acid. The alloy is treated in an electrochemical cell in which said alloy acts as an anode. The cell contains an inventive composition at a temperature between 20° C. and 40° C. as an electrolyte. An initial voltage which is sufficient to create a current density between 1.5 and 2.5 A/dm2 is applied to the cell, whereupon the voltage is progressively increased to a level ranging between 240 and 330 V in order to maintain the initial current density.
    Type: Application
    Filed: January 31, 2003
    Publication date: April 7, 2005
    Inventors: Helene Ardelean, Philippe Marcus
  • Composition and method for treating magnesium alloys
    Publication number: 20040217330
    Abstract: The invention relates to a composition and method for treating a magnesium alloy. The inventive composition comprises an acid aqueous solution containing niobium pentoxide, a water-soluble cerium salt and, optionally, a zirconium salt and/or hydroflouric acid. Said method consists in submerging a magnesium alloy part in said composition. The invention can be used to protect magnesium alloy parts against corrosion.
    Type: Application
    Filed: November 25, 2003
    Publication date: November 4, 2004
    Inventors: Helene Ardelean, Philippe Marcus