Patents by Inventor David William Keeler

David William Keeler 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).

  • Fluorination process
    Patent number: 6166275
    Abstract: A liquid phase fluorination process for producing difluoromethane without corrosion is provided. In the process of this invention, methylene chloride and hydrogen fluoride are reacted in a reactor made of fluorinated polymer to produce a reaction product while a vaporized and superheated recycle stream of process reactants is fed into the reactor.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: December 26, 2000
    Inventors: Gustavo Cerri, Maurice William Hunt, David William Keeler, Frank Peter Young