Patents by Inventor Willem Dijkstra

Willem Dijkstra 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).

  • Publication number: 20080051616
    Abstract: The invention is directed to a process for the hydrogenation of hydrocarbon resins in the presence of a precious metal catalyst, wherein the hydrogenation is performed in the additional presence of at least one metal oxide, capable of reacting with sulfide and/or halogen.
    Type: Application
    Filed: September 5, 2007
    Publication date: February 28, 2008
    Inventors: Bernard Reesink, Willem Dijkstra
  • Patent number: 7285695
    Abstract: The invention is directed to a process for the hydrogenation of hydrocarbon resins in the presence of a precious metal catalyst, wherein the hydrogenation is performed in the additional presence of at least one metal oxide, capable of reacting with sulfide and/or halogen.
    Type: Grant
    Filed: November 1, 2000
    Date of Patent: October 23, 2007
    Assignee: Engelhard Corporation
    Inventors: Bernard Hendrik Reesink, Willem Dijkstra
  • Patent number: 6855245
    Abstract: The invention is directed to a process for the hydrogenation of a sulfur containing feedstock, having a sulfur content of less than 50 ppm, wherein the feedstock is hydrogenated in the presence of a precious metal catalyst and a nickel-catalyst, said process being carried out in such a manner, that the feedstock is contacted with a mixture of precious metal catalyst, metal oxide and nickel catalyst, the feedstock is contacted initially with the precious metal catalyst followed by contact with the metal oxide and nickel catalyst, either in combination or sequentially, or the feedstock is contacted first with a mixture of precious metal catalyst and metal oxide, followed by contact with the nickel catalyst.
    Type: Grant
    Filed: July 20, 1999
    Date of Patent: February 15, 2005
    Assignee: Engelhard Corporation
    Inventors: Bernard Hendrik Reesink, Willem Dijkstra, Pieter Hildegardus Berben, Marius Vaarkamp