Patents by Inventor Johan J. G. Thoelen

Johan J. G. Thoelen 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 for the separation of impurities from a hot synthesis gas mixture in the preparation of melamine
    Patent number: 5716429
    Abstract: Disclosed is an improved method for separating impurities from a hot synthesis gas mixture which is obtained in the preparation of melamine and urea. The improved separation is achieved by use of filters made of sintered, essentially pure chromium, molybdenum, tungsten, or a mixture of any of these elements.
    Type: Grant
    Filed: August 26, 1996
    Date of Patent: February 10, 1998
    Assignee: DSM N.V.
    Inventors: Julius G. T. Van Wijck, Cornelis G. M. Van De Moesdijk, Johan J. G. Thoelen