Patents by Inventor Frederick R. Lawrence

Frederick R. Lawrence 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 preparing aniline
    Patent number: 4415754
    Abstract: Aniline can be prepared by catalytic hydrogenation of nitrobenzene containing polynitrophenol impurities. The polynitrophenol impurities are converted to tars, and can be separated and disposed of.
    Type: Grant
    Filed: January 17, 1983
    Date of Patent: November 15, 1983
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventor: Frederick R. Lawrence
  • Catalytic nitration of aromatic compounds
    Patent number: 4234470
    Abstract: A process for the continuous catalytic vapor-phase mononitration of aromatic compounds, especially benzene, using as the catalyst an .alpha.-fluorosulfonic acid polymer admixed with a complement inert to the nitration reaction and dimensionally stable under the reaction conditions.
    Type: Grant
    Filed: April 23, 1979
    Date of Patent: November 18, 1980
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Frederick R. Lawrence