Patents by Inventor Werner Zwick

Werner Zwick 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 ammonium carbamate
    Patent number: 4567294
    Abstract: In the preparation of ammonium carbamate by reacting ammonia with carbon dioxide, the reactants are introduced into a layer of ammonium carbamate which is kept in the fluidized state by gaseous ammonia or carbon dioxide. The temperature is kept below 25.degree. C. by removing the heat of reaction.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: January 28, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Dressel, Heinrich Eberle, Willi Ripperger, Wolfgang Ruehenbeck, Werner Zwick