Patents by Inventor Hanns-Helge Stechl

Hanns-Helge Stechl 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).

  • Cleanup of nitroaromatics-containing wastewaters
    Patent number: 6245242
    Abstract: Aromatic nitro compounds in waste waters from nitrobenzene production plants are degraded by treatment with ozone at 60-100° C. 1.5-10 bar and pH 3 to 12.
    Type: Grant
    Filed: February 20, 1996
    Date of Patent: June 12, 2001
    Assignee: BASF Aktiengesellschaft
    Inventors: Ludwig Schuster, Hanns-Helge Stechl, Dietrich Wolff