Patents by Inventor Didier Arnaud

Didier Arnaud 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).

  • Azeotropic mixtures of dimethyl ether and of 1,1,1,2-tetrafluoroethane and their use
    Patent number: 5188748
    Abstract: This invention proposes to employ a mixture of dimethyl ether and of 1,1,1,2-tetrafluoroethane as refrigerant fluids to replace chlorofluorocarbons.These compounds form an azeotrope which, at its normal boiling point (approximately -22.4.degree. C. at 1.013 bar), contains approximately 62.3 mass % of 1,1,1,2-tetrafluoroethane.The mixture according to the invention can also be employed as aerosol propellant or as blowing agent for plastic foams.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: February 23, 1993
    Assignee: Societe Atochem
    Inventors: Didier Arnaud, Jean-Claude Tanguy
  • Azeotropic mixture with 1,1,1-trifluoroethane and propane a low boiling point and its applicatons as a refrigerant fluid, as an aerosol propellant, or as a blowing agent for plastic foams
    Patent number: 5080823
    Abstract: The invention relates to an azeotrope with a minimum boiling point, capable of being employed as a refrigerating fluid replacing trifluorobromomethane (Halon 1301) in industrial refrigeration systems at very low temperature with single-stage compression.The azeotrope according to the invention is a mixture of 1,1,1-trifluoroethane (HFA 143a) and of propane (R290). At the normal boiling point (approximately -53.4.degree. C. at 1.013 bars), its 1,1,1-trifluoroethane content is approximately 70.6 mass % and that of propane 29.4 %.This azeotrope can also be employed as an aerosol propellant or as a blowing agent for plastic foams.
    Type: Grant
    Filed: April 2, 1991
    Date of Patent: January 14, 1992
    Assignee: Societe Atochem
    Inventors: Didier Arnaud, Jean C. Tanguy