Patents by Inventor John Aloysius Wismer

John Aloysius Wismer 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 1,1,1-trifluoroethane
    Patent number: 5639924
    Abstract: Process for synthesizing 1,1,1-trifluoroethane (143a) in the gaseous phase by reacting 1,1-defluoro-1-chloroethane in gaseous phase in the presence of a Cr catalyst. The process may be run isothermally or adiabatically, without co-feeding air or other oxygen containing gas, in the presence or absence of a Ni, Co, Zn or Mn cocatalyst for the Cr catalyst. The catalyst may be unsupported or supported with a support preferably selected from activated carbon, alumina and fluorided alumina. The formation of olefin byproduct can be kept to less than 10 ppm in accordance with the process of the invention.
    Type: Grant
    Filed: November 29, 1994
    Date of Patent: June 17, 1997
    Assignee: Elf Atochem North America, Inc.
    Inventors: Maher Yousef Elsheikh, Michael Sheppard Bolmer, Jean Pierre Schirmann, John Aloysius Wismer, Wayne E. Brooks