Patents by Inventor Fred C. Trager

Fred C. Trager 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).

  • Separation of hydrogen fluoride from 1,1-difluoroethene
    Patent number: 4818513
    Abstract: A gaseous feed stream comprising hydrogen fluoride and 1,1-difluoroethane is contacted with liquid organic barrier material in a condensing zone to partially condense the feed stream. The gaseous phase remaining after the partial condensation comprises most of the 1,1-difluoroethane originally present in the feed stream while the liquid condensate comprises most of the hydrogen fluoride originally present in the feed stream. The gaseous phase and the liquid condensate are removed from the condensing zone as separate streams. Less than about 50 percent of the 1,1-difluoroethane originally present in the feed stream reacts with hydrogen fluoride to form 1,1,1-trifluoroethane during the partial condensation and the removal of the separate streams from the condensing zone. The preferred liquid organic barrier material is 1,1,-trifluoroethane.
    Type: Grant
    Filed: December 21, 1987
    Date of Patent: April 4, 1989
    Assignee: PPG Industries, Inc.
    Inventors: Fred C. Trager, J. Douglas Mansell, W. Eugene Wimer