Patents by Inventor Pierre-Yves Lahary

Pierre-Yves Lahary 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).

  • Semi-crystalline, semi-aromatic copolyamides
    Patent number: 5440006
    Abstract: Semi-crystalline, semi-aromatic copolyamides derived from terephthalic acid and mixtures comprising an alkylpentamethylene diamine and hexamethylenediamine by a process including thermal polycondensation in a closed system of the autoclave type.
    Type: Grant
    Filed: March 16, 1994
    Date of Patent: August 8, 1995
    Assignee: Rhone-Poulenc Chimie
    Inventors: Pierre-Yves Lahary, Jean Coquard
  • Preparation of maleamic acid
    Patent number: 5399750
    Abstract: Maleamic acid (aminomaleic acid) is improvedly prepared by reacting gaseous ammonia with molten maleic anhydride under reactant contact conditions of high surface area, for example reacting said gaseous NH.sub.3 with a thin film of said molten maleic anhydride or with said molten maleic anhydride in a state of vigorous agitation.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: March 21, 1995
    Assignee: Rhone-Poulenc Chimie
    Inventors: Daniel Brun, Pierre-Yves Lahary
  • Preparation of amorphous/semicrystalline semi-aromatic (co)polyamides
    Patent number: 5336754
    Abstract: Amorphous or semicrystalline semi-aromatic copolyamides are prepared, with significantly reduced loss of amino reactant, by polycondensing an acidic monomer which includes at least one aromatic dicarboxylic acid having from 8 to 18 carbon atoms with an amino comonomer consisting essentially of an alkylpentamethylenediamine, or salt thereof, wherein said polycondensation is carried out in a closed reaction zone.
    Type: Grant
    Filed: January 4, 1993
    Date of Patent: August 9, 1994
    Assignee: Rhone-Poulenc Chimie
    Inventors: Pierre-Yves Lahary, Serge Roy
  • Semi-crystalline, semi-aromatic copolyamides
    Patent number: 5322923
    Abstract: The present invention relates to semi-crystalline, semi-aromatic copolyamides, derived from terephthalic acid and mixtures comprising an alkylpentamethylenediamine and hexamethylenediamine.
    Type: Grant
    Filed: November 2, 1992
    Date of Patent: June 21, 1994
    Assignee: Rhone-Poulenc Chimie
    Inventors: Pierre-Yves Lahary, Jean Coquard
  • Preparation of amorphous/semicrystalline semi-aromatic (co)polyamides from alkyl pentamethylene diamine
    Patent number: 5109106
    Abstract: Amorphous or semicrystalline semi-aromatic copolyamides are prepared, with significantly reduced loss of amino reactant, by polycondensing an acidic monomer which includes at least one aromatic dicarboxylic acid having from 8 to 18 carbon atoms with an amino comonomer consisting essentially of an alkylpentamethylenediamine, or salt thereof, wherein said polycondensation is carried out in a closed reaction zone.
    Type: Grant
    Filed: February 21, 1990
    Date of Patent: April 28, 1992
    Assignee: Rhone-Poulenc Chimie
    Inventors: Pierre-Yves Lahary, Serge Roy