Patents by Inventor Helen A. Connon

Helen A. Connon 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).

  • Halocarbon blends for refrigerant use
    Patent number: 4810403
    Abstract: A unique refrigerant containing three or more halocarbons, each halocarbon after the first having a successively higher boiling point. The refrigerant has a temperature/pressure relation substantially equal to FC-12. Also provided is a method for producing cooling and a method for producing heating using this refrigerant.
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: March 7, 1989
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Donald B. Bivens, Helen A. Connon
  • Azeotropic compositions of trichlorotrifluoroethane, dichlorodifluoroethane and methanol/ethanol
    Patent number: 4715900
    Abstract: Azeotropic mixtures of 1,1,2-trichloro-1,2,2-trifluoroethane (FC-113) and 1,2-dichloro-1,1-difluoroethane (FC-132b) with methanol or ethanol, the azeotropic mixtures being useful in solvent cleaning applications.
    Type: Grant
    Filed: January 8, 1987
    Date of Patent: December 29, 1987
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Helen A. Connon, Robert A. Gorski, William G. Kenyon, Akimichi Yokozeki