Patents by Inventor Richard Llewellwyn Powell

Richard Llewellwyn Powell 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).

  • Products of tetrafluorothanes
    Patent number: 5744660
    Abstract: This invention relates to a process for the production of 1,1,2,2- and/or 1,1,1,2-tetrafluoroethanes, and in particular to a process for the production of 1,1,1,2-tetrafluoroethane.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: April 28, 1998
    Assignee: Imperial Chemical Industries PLC
    Inventors: Lisa Bradley, Leslie Burgess, Richard Llewellwyn Powell, Geoffrey James Moore, Paul Nicholas Ewing, Kenneth Taylor