Patents by Inventor Marc Lebon

Marc Lebon 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).

  • Process for the purification of N-carboxyanhydrides of amino acids
    Publication number: 20040124144
    Abstract: The invention relates to a process for the purification of N-carboxyanhydrides of amino acids which is characterized in that the N-carboxyanhydrides, in solution or in suspension in a nonpolar solvent medium, are brought into contact with silica.
    Type: Application
    Filed: October 21, 2003
    Publication date: July 1, 2004
    Inventors: Antoine Paris, Marc Lebon
  • Process for the preparation of N-carboxyanhydrides
    Patent number: 6603016
    Abstract: The invention relates to an improved process for the preparation of N-carboxyanhydrides by reaction of the corresponding amino acid or one of its salts with phosgene, diphosgene and/or triphosgene in a solvent medium, characterized in that at least a portion of the reaction is carried out under a pressure of less than 1000 mbar. The N-carboxyanhydrides are thus obtained with better yields and an improved purity.
    Type: Grant
    Filed: May 30, 2002
    Date of Patent: August 5, 2003
    Assignee: Isochem
    Inventors: Fabrice Cornille, Marc Lebon
  • Process for the preparation of N-carboxyanhydrides
    Publication number: 20020183551
    Abstract: The invention relates to an improved process for the preparation of N-carboxyanhydrides by reaction of the corresponding amino acid or one of its salts with phosgene, diphosgene and/or triphosgene in a solvent medium, characterized in that at least a portion of the reaction is carried out under a pressure of less than 1000 mbar. The N-carboxyanhydrides are thus obtained with better yields and an improved purity.
    Type: Application
    Filed: May 30, 2002
    Publication date: December 5, 2002
    Inventors: Fabrice Cornille, Marc Lebon
  • Separation and recovery of solids from liquids containing them using the ionic flotation process
    Patent number: 4844873
    Abstract: Improvement to the separation and recovery of solids from liqiuds containing them, and using a ionic flotation process, implementing an installation characterized in that it comprises at least a vat (1) for pretreating the solution to be treated for the insolubilization of the solid to be recovered and the formation of a suspension maintained under stirring conditions (stirrer 2), at least a flotation cell (5) supplied with said suspension, at least a device (4) provided between said vat (1) and said flotation cell (5) adapted to generate within the cell a rising non-turbulent stream intended to convey the desired solid towards the surface of said suspension while maintaining at said surface a calm area for the accumulation of said solid and at least one means for the recovery of said solid (6-7).
    Type: Grant
    Filed: July 22, 1986
    Date of Patent: July 4, 1989
    Assignee: Institut National de Recherche Chimique Applique
    Inventors: Marc Lebon, Michele Prevost, El A. Jdid, Pierre Blazy