Patents by Inventor Thomas M. Hilderbrand

Thomas M. Hilderbrand 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).

  • Purification of kaolin clay by froth flotation using hydroxamate collectors
    Patent number: 4629556
    Abstract: An improved flotation process for removal of colored titaniferous impurities from kaolin clay uses as collector a hydroxamate compound, or a mixture of compounds, having the formula ##STR1## in which R is an alkyl, aryl, or alkylaryl group having 4-28, and preferably 6-24 carbon atoms, and M represents an alkali metal, an alkaline earth metal or hydrogen. The process does not require the use of activators to make the collector adsorb selectively on the colored impurities.
    Type: Grant
    Filed: November 29, 1984
    Date of Patent: December 16, 1986
    Assignee: Thiele Kaolin Company
    Inventors: Roe-Hoan Yoon, Thomas M. Hilderbrand