Patents by Inventor Wilhelm Donike

Wilhelm Donike 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 producing Diels-Alder adducts while inhibiting the formation of polymeric by-products
    Patent number: 4538013
    Abstract: A process for preventing the formation of polymeric by-products during the production of Diels-Alder adducts is improved by the addition of NO or of a compound splitting off NO in situ, as a polymerization inhibitor. This process is especially effective for preventing the formation of polymeric by-products in the manufacture of 5-vinylnorbornene-2. In a tubular reactor, when observing narrow temperature and pressure ranges, a high selectivity is obtained in the production of this adduct.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: August 27, 1985
    Assignee: Chemische Werke Huls AG
    Inventors: Wilhelm Donike, Helmut Ulrich, Heinz Thiemer, Josefa Pieper