Patents Represented by Attorney James J. Flynn

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  • Substantially constant boiling compositions of 1,1,1,2-tetra-fluoroethane and dimethyl ether
    Patent number: 5284596
    Abstract: Substantially constant boiling compositions of 1,1,1,2-tetrafluoroethane and dimethyl ether and its use as a refrigerant, aerosol propellant and polymer foam blowing agent are disclosed.
    Type: Grant
    Filed: November 26, 1991
    Date of Patent: February 8, 1994
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Akimichi Yokozeki
  • Process for separating pentafluoroethane from a mixture of halogenated hydrocarbons containing chloropentafluoroethane
    Patent number: 5087329
    Abstract: Separating pentafluoroethane from a mixture of pentafluoroethane and chloropentafluoroethane by adding a fluorocarbon extractive agent having 1-4 carbon atoms, and optionally containing hydrogen and/or chlorine, in an extractive distillation zone to recover pentafluoroethane substantially free of chloropentafluoroethane in the overhead product stream.
    Type: Grant
    Filed: May 16, 1991
    Date of Patent: February 11, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Vinci M. Felix