Patents by Inventor Patrick Douais

Patrick Douais 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).

  • Fireproofing polyamide powders and their use in a sintering process
    Patent number: 8669307
    Abstract: A subject-matter of the invention is the use of a polyamide powder possessing a fireproofing property in a process for the manufacture of an object made of polyamide by sintering this powder using radiation, the said powder comprising, by weight, 2 to 40% of at least one flame retardant for respectively 98 to 60% of at least one polyamide, the flame retardant being a blend of at least one organic phosphinate of a metal and of at least ammonium polyphosphate.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: March 11, 2014
    Assignee: Arkema France
    Inventors: Patrick Douais, Gregory Filou
  • Increase in the melting point and the enthalpy of melting of polyamides by a water treatment
    Patent number: 7468405
    Abstract: A method for increasing at least one of the following two parameters of a polyamide: (I) its melting point and (ii) its enthalpy of melting ?Hm, in which: this polyamide is brought into contact in the solid state with water or with steam at a temperature close to its crystallization temperature Tc for a time long enough to effect this increase; then, the water (or steam) is separated from the polyamide and the polyamide is dried.
    Type: Grant
    Filed: October 22, 2003
    Date of Patent: December 23, 2008
    Assignee: Atofina
    Inventors: Jean-Philippe Allen, Philippe Blondel, Patrick Douais
  • Fireproofing polyamide powders and their use in a sintering process
    Publication number: 20060041041
    Abstract: A subject-matter of the invention is the use of a polyamide powder possessing a fireproofing property in a process for the manufacture of an object made of polyamide by sintering this powder using radiation, the said powder comprising, by weight, 2 to 40% of at least one flame retardant for respectively 98 to 60% of at least one polyamide, the flame retardant being a blend of at least one organic phosphinate of a metal and of at least ammonium polyphosphate.
    Type: Application
    Filed: July 20, 2005
    Publication date: February 23, 2006
    Inventors: Patrick Douais, Gregory Filou
  • Increase in the melting point and the enthalpy of melting of polyamides by a water treatment
    Publication number: 20040138344
    Abstract: The present invention relates to a method for increasing at least one of the following two parameters of a polyamide: (i) its melting point and (ii) its enthalpy of melting &Dgr;Hm, in which:
    Type: Application
    Filed: October 22, 2003
    Publication date: July 15, 2004
    Inventors: Jean-Philippe Allen, Philippe Blondel, Patrick Douais
  • Composite material comprising a self-adhesive composition coating layer
    Patent number: 6251515
    Abstract: The invention relates to a self-adhesive powder composition with improved resistance to creep, based on thermoplastic and/or heat-curable resins and acicular calcium carbonate. The composition is applied in powder form onto a metal substrate and then a creep-resistant coating is obtained by melting the powder.
    Type: Grant
    Filed: October 29, 1999
    Date of Patent: June 26, 2001
    Inventors: Patrick Douais, Didier Juhue, Olivier Julien, Michael Werth
  • Self-Adhesive compositions for coating metal substrates with improved resistance to creep
    Patent number: 6011100
    Abstract: The invention relates to a self-adhesive powder composition with improved resistance to creep, based on thermoplastic and/or heat-curable resins and acicular calcium carbonate. The composition is applied in powder form onto a metal substrate and then a creep-resistant coating is obtained by melting the powder.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: January 4, 2000
    Assignee: Elf Atochem S.A.
    Inventors: Patrick Douais, Didier Juhue, Olivier Julien, Michael Werth
  • Thermotropic aromatic copolyesters comprising recurring structural units derived from para-(para-hydroxyphenoxy)benzoic acid or derivative thereof
    Patent number: 5138021
    Abstract: Novel thermotropic aromatic copolyesters comprise the following recurring structural units: ##STR1## and are prepared by polycondensing p-(p-hydroxyphenoxy)-benzoic acid with an aromatic or cycloaliphatic diacid, a diphenol and, optionally, p-hydroxybenzoic acid.
    Type: Grant
    Filed: October 24, 1990
    Date of Patent: August 11, 1992
    Assignee: Atochem
    Inventors: Didier Judas, Patrick Douais