Patents by Inventor Giovanni De Roit

Giovanni De Roit 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 preparation of bis(2,2,6,6-tetramethyl-4-piperidyl)amine
    Patent number: 4923992
    Abstract: A one step process for the preparation of bis(2,2,6,6-tetramethyl-4-piperidyl)amine by reacting 2,2,6,6-tetramethyl-4-piperidone or 2,2,6,6-tetramethyl-4-piperidone x H.sub.2 O with ammonia and hydrogen in the presence of a hydrogenation catalyst, characterized in that the molar ratio of 2,2,6,6-tetramethyl-4-piperidone versus ammonia is between 1:0.4 and 1:0.8.
    Type: Grant
    Filed: March 27, 1989
    Date of Patent: May 8, 1990
    Assignee: Ciba-Geigy Corporation
    Inventors: Graziano Vignali, Giovanni De Roit, Paul Dubs, Peter Baumeister