Patents by Inventor Herbert V. Diehl

Herbert V. Diehl 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).

  • Method of producing amines
    Patent number: 7205440
    Abstract: The invention relates to a special two-step method for producing amines on the basis of amides by reacting them with halides or hypohalites in an aqueous solution in a Hofmann degradation reaction. The amide is reacted in an alkaline solution and/or suspension with halides or hypohalites and the reaction mixture obtained in step 1 is added to an aqueous alkaline solution having a temperature of at least 40° C.
    Type: Grant
    Filed: December 17, 2002
    Date of Patent: April 17, 2007
    Assignee: Lanxess Deutschland GmbH
    Inventors: Peter Wenzl, Friedrich Dürrholz, Herbert V. Diehl
  • Process for the preparation of weakly acid cation exchange resins
    Patent number: 5175193
    Abstract: The invention relates to an environment-friendly process for the preparation of weakly acid cation exchange resins by hydrolysis of crosslinked acrylonitrile bead polymers with an alkaline hydrolizing agent at elevated temperature, according to which the bead polymer and alkaline hydrolizing agent are brought together at elevated temperature only.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: December 29, 1992
    Assignee: Bayer Aktiengesellschaft
    Inventors: Harold Heller, Friedrich Werner, Alfred Mitschker, Herbert V. Diehl, Axel Schafer