Patents by Inventor Wolfgang Rrbczynski

Wolfgang Rrbczynski 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 preparing 1-amino-2, 6-dimethylpiperidine
    Patent number: 5514806
    Abstract: The present invention relates to improved processes for the preparation of 1-amino-2,6-dimethylpiperidine whereby the yield is more than 90%. The processes involve the hydrogenation of 1-nitroso-2,6-dimethylpiperidine in the presence of a palladium catalyst partly poisoned with iron ions but in the substantial absence of water or other solubilizing agents added to the reaction vessel.
    Type: Grant
    Filed: May 17, 1994
    Date of Patent: May 7, 1996
    Assignee: Cassella Aktiengesellschaft
    Inventors: Wolfgang Rrbczynski, Manfred Schrod