Patents by Inventor Robert L. Protzmann

Robert L. Protzmann 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).

  • Preparation of diaryl sulfones
    Patent number: 4822916
    Abstract: Diaryl sulfones are formed in a two-stage procedure. The first involves the reaction of an aryl sulfonic acid with an aryl reagent containing active hydrogen while by-product water is removed azeotropically. In the second stage, which contains unreacted sulfonic acid, is treated with a sulfone condensing agent and additional aryl reagent to react additional, unreacted aryl sulfonic acid from the first stage.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: April 18, 1989
    Assignee: Akzo America Inc.
    Inventors: Alan M. Aaronson, Robert L. Protzmann, John Tomko