Patents by Inventor Norbert Hamm

Norbert Hamm 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 continuous indirect diazotization of aromatic amines
    Patent number: 4233213
    Abstract: Fluctuations in concentration of the starting materials during continuous diazotization are taken into account by passing a component stream from the receiver to the diazotization vessel through an analyser where, for a short residence time, the nitrite content is determined by an electrochemical measuring technique. A required nitrite excess is adjusted in the receiver on the basis of this measurement. By virtue of the pH-value, however, a diazotization reaction still does not take place in the receiver.
    Type: Grant
    Filed: September 1, 1978
    Date of Patent: November 11, 1980
    Assignee: Bayer Aktiengesellschaft
    Inventors: Kurt Breig, Georg Dehmel, Norbert Hamm