Patents by Inventor Gilles Darago

Gilles Darago 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 1,1-dichloro-1-fluoroethane
    Patent number: 5346594
    Abstract: A process for purification of crude, 1,1-dichloro-1-fluoroethane includes the steps of treating a mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine in the presence of a Lewis acid, and distilling to recover purified 1,1-dichloro-1-fluoroethane, wherein hydrogen fluoride is present during the treatment with chlorine at a ratio of at least 5% by weight with respect to the mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride.
    Type: Grant
    Filed: January 12, 1993
    Date of Patent: September 13, 1994
    Assignee: Solvay (Societe Anonyme)
    Inventors: Paul Lechaude, Gilles Darago, Philippe Krafft, Jean-Pierre Catinat
  • Purification process for a hydrofluoroalkane
    Patent number: 5306850
    Abstract: Process for purifying a hydrofluoroalkane with respect to impurities which are less volatile than the hydrofluorocarbon, by distillation in the presence of an acid-scavenger, for example a C.sub.3 -C.sub.8 olefin.
    Type: Grant
    Filed: March 31, 1993
    Date of Patent: April 26, 1994
    Assignee: Solvay (Societe Anonyme)
    Inventor: Gilles Darago