Patents by Inventor Nelius Dempers Refief

Nelius Dempers Refief 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).

  • TREATMENT OF ZIRCONIA-BASED MATERIAL WITH AMMONIUM BI-FLUORIDE
    Publication number: 20130011329
    Abstract: A process for treating a zirconia-based material comprises reacting, in a reaction step, the zirconia-based material with ammonium bifluoride, NH4F.HF. An ammonium fluorozirconic compound is produced.
    Type: Application
    Filed: July 29, 2010
    Publication date: January 10, 2013
    Inventors: Willem Liebenberg Retief, Nelius Dempers Refief, Johannes Theodorus Nel, Wilhelmina Du Plessis, Philippus Lodewyk Crouse