Patents by Inventor Paul H Stewert

Paul H Stewert 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 production of pentafluroethane
    Patent number: 8415515
    Abstract: A process for the production of dichlorotrifluoroethane is described. The process comprises reacting perchloroethylene with hydrogen fluoride (HF) at elevated temperature in the vapour phase in at least one reactor in the presence of a fluorination catalyst. The process is operated so that 30 weight % or more of the perchloroethylene reactant that is fed to the at least one reactor remains unreacted having passed through the or each reactor. The dichlorotrifluoroethane may be purified and then used as it is or used to prepare pentafluoroethane.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: April 9, 2013
    Assignee: Mexichem Amanco Holding S.A. de C.V.
    Inventors: Clive R Giddis, Paul H Stewert