Patents by Inventor Johannes Gerard Wijmans

Johannes Gerard Wijmans 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).

  • Natural gas separation using nitrogen-selective membranes of modest selectivity
    Patent number: 6572678
    Abstract: A process for treating natural gas or other methane-rich gas to remove excess nitrogen and optionally excess carbon dioxide, water vapor or hydrogen sulfide. The invention relies on gas separation by membranes, using nitrogen/methane selective membranes. The membranes are characterized by having the capability to exhibit a nitrogen/methane selectivity between about 2 and 5 at a temperature higher than about −25° C. The gas may be brought to pipeline specification for nitrogen, and acid gases if present, without requiring the use of amine scrubbing or other acid gas removal technique.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: June 3, 2003
    Assignee: Membrane Technology and Research, Inc.
    Inventors: Johannes Gerard Wijmans, Richard W. Baker, Zhenjie He, Ingo Pinnau