Patents by Inventor Helen Marie Schoelzel

Helen Marie Schoelzel 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).

  • Hydrogen fluoride recovery process
    Patent number: 5800795
    Abstract: Process for the recovery of hydrogen fluoride (HF) from a mixture, preferably an azeotropic mixture, of HF with water and/or an organic compound such as 134a, 125 or 133a, which comprises contacting the mixture with lithium fluoride or an alkaline earth metal fluoride to form a metal fluoride-hydrogen fluoride compound (e.g. lithium bifluoride, LiHF.sub.2), separating the compound and decomposing it to liberate hydrogen fluoride therefrom. The process is useful for recovering HF from azeotropic or azeotropic-like mixtures.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: September 1, 1998
    Assignee: Imperial Chemical Industries PLC
    Inventors: Thomas Anthony Ryan, John Graham Allen, Helen Marie Schoelzel, Massimino Ugo Pilotti