Patents by Inventor Mary A. Winterhoff

Mary A. Winterhoff 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).

  • Coal conditioning process
    Patent number: 5402894
    Abstract: A process for improving the efficiency of coal dewatering and deashing uses complexing agents such as sodium gluconate in alkaline solution to form soluble compounds with cations such as Al.sup.+3, Fe.sup.+3, Mg.sup.+2, and Ca.sup.+2. The formation of such compounds reduces the adsorption and/or desorbs clay slimes from the coal surface.
    Type: Grant
    Filed: October 18, 1993
    Date of Patent: April 4, 1995
    Assignee: Chemical Dewatering Technology, Inc.
    Inventor: Mary A. Winterhoff