Patents by Inventor Dietmar Kyewski

Dietmar Kyewski 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).

  • Silver catalyst for the oxidation of ethylene to ethylene oxide and process for preparing ethylene oxide
    Patent number: 5734068
    Abstract: The invention relates to a silver catalyst for the partial oxidation of ethylene with molecular oxygen in the gas phase to form ethylene oxide and a process for preparing ethylene oxide using this catalyst. The catalyst is superior to comparable catalysts of the prior art through an increased selectivity (at high activity) and/or a more favorable ageing behavior. The process for preparing ethylene oxide is distinguished by improved economics.
    Type: Grant
    Filed: March 25, 1997
    Date of Patent: March 31, 1998
    Assignee: Huels Aktiengesellschaft
    Inventors: Burkhard Klopries, Harald Metz, Wilma Dibowski, Dietmar Kyewski, Jurgen Pospiech
  • Silver catalyst for the oxidation of ethylene oxide
    Patent number: 5668077
    Abstract: The invention relates to a silver catalyst for the partial oxidation of ethylene with molecular oxygen in the gas phase to form ethylene oxide and a process for preparing ethylene oxide using this catalyst. The catalyst is superior to comparable catalysts of the prior art through an increased selectivity (at high activity) and/or a more favorable ageing behavior. The process for preparing ethylene oxide is distinguished by improved economics.
    Type: Grant
    Filed: March 29, 1996
    Date of Patent: September 16, 1997
    Assignee: Huels Aktiengesellschaft
    Inventors: Burkhard Klopries, Harald Metz, Wilma Dibowski, Dietmar Kyewski, Jurgen Pospiech
  • Oxidation of ethylene
    Patent number: 5281728
    Abstract: A silver catalyst suitable for the oxidation of ethylene is provided in which the silver within a support particle, e.g., alumina, is non-uniformly distributed so that the silver concentration is clearly greater on the geometric surface and in the surface layer just beneath less than 0.5 mm thick than in the interior of the particles. The concentration of silver in the layer is two to a thousand times the concentration in the interior of the catalyst.
    Type: Grant
    Filed: November 23, 1992
    Date of Patent: January 25, 1994
    Assignee: Huls Aktiengesellschaft
    Inventors: Christian Wunde, Wilma DiBowski, Dietmar Kyewski
  • Silver catalyst suitable for oxidation of ethylene and process for the production of the catalyst
    Patent number: 5173469
    Abstract: A silver catalyst suitable for the oxidation of ethylene is provided in which the silver within a support particle, e.g., alumina, is non-uniformly distributed so that the silver concentration is clearly greater on the geometric surface and in the surface layer just beneath less than 0.5 mm thick than in the interior of the particles. The concentration of silver in the layer is two to a thousand times the concentration in the interior of the catalyst.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: December 22, 1992
    Assignee: Huels Aktiengesellschaft
    Inventors: Christian Wunde, Wilma Dibowski, Dietmar Kyewski