Patents by Inventor Johan P. R. De Villiers

Johan P. R. De Villiers 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).

  • Determination of mineral concentrations in slurries thereof
    Patent number: 4090073
    Abstract: A method of x-ray diffraction determination of the concentration of predetermined minerals in slurries comprises presenting a sample in the form of a stream of slurry having areas of two opposing sides thereof unsupported by any boundary walls therefor, and making required determinations through the unsupported areas of the stream of slurry using x-radiation of a suitable wavelength.
    Type: Grant
    Filed: October 5, 1976
    Date of Patent: May 16, 1978
    Assignee: National Institute for Metallurgy
    Inventors: Johan P. R. De Villiers, George T. W. Ormrod