Patents by Inventor Jean-Paul Merval

Jean-Paul Merval 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).

  • Polyamide and/or polyetheresteramide thermoplastic powder coating compositions comprising epoxy/sulfonamide resins
    Patent number: 5409999
    Abstract: Thermoplastic powder coating compositions including a polyamide and/or polyetheresteramide constituent and an epoxy/sulfonamide resin constituent are well adapted for coating a wide variety of metal substrates, e.g., by electrostatic spraying, without the requirement for first treating such substrates with an adhesion primer.
    Type: Grant
    Filed: August 16, 1993
    Date of Patent: April 25, 1995
    Assignee: Elf Atochem S.A.
    Inventors: Jean-Paul Merval, Eric Perraud, Stephen Rennie
  • Thermoplastic polyamide/polyetheresteramide powders for the direct coating of metal substrates
    Patent number: 5387653
    Abstract: Thermoplastic powders well adapted for the direct adherent coating of metal substrates, i.e., without requiring an intermediate adherence primer layer, are based on a polyamide and/or a polyetheresteramide, and contain an effective amount of a polycondensate of an aromatic sulfonamide with an aldehyde or dicarboxylic acid.
    Type: Grant
    Filed: August 2, 1993
    Date of Patent: February 7, 1995
    Assignee: Atochem
    Inventors: Jean-Paul Merval, Jean-Yves Peschard, Stephen Rennie
  • Polyamide-coated particles and process for their preparation
    Patent number: 4764424
    Abstract: Solid particles are coated with a uniform and continuous polyamide layer by immersion in a reaction medium capable of forming polyamides by anionic polymerization in solution.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: August 16, 1988
    Assignee: Atochem
    Inventors: Roland Ganga, Jacques Grossoleil, Jean-Paul Merval
  • Polyamide-imide powders, compositions containing the same and method of making the powders
    Patent number: 4737304
    Abstract: The process for the manufacture of infusible and insoluble polyamide-imide powders of spheroidal form comprising first reacting at least one lactam in solution with a polyamide generator in the presence of an anionic polymerization catalyst and then adding to the polymerization reaction a polyisocyanate in an amount sufficient to first activate said polymerization and then to react with the polyamide chains being formed and to bridge the same; the resultant product; and lubricants comprising a lubricating fluid and the resultant product.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: April 12, 1988
    Assignee: Atochem
    Inventors: Man Vo Dinh, Jean-Paul Merval