Patents by Inventor Chunming Su

Chunming Su 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).

  • Method of treating a subsurface formation with ferrous iron to reduce contaminants to harmless species
    Patent number: 7166228
    Abstract: A method for treating a subsurface formation with a ferrous compound, to reduce a contaminant therein, involves introducing into the subsurface formation a ferrous compound in combination with sodium hydrosulfite in an amount sufficient to substantially prevent precipitation, during the introducing, of a major portion of the ferrous compound. The method was found to be useful in the reduction of hexavalent chromium to trivalent chromium at a Superfund site.
    Type: Grant
    Filed: October 14, 2004
    Date of Patent: January 23, 2007
    Assignee: U.S. Environmental Protection Agency
    Inventors: Ralph D. Ludwig, Chunming Su
  • Method of treating a subsurface formation with ferrous iron to reduce contaminants to harmless species
    Publication number: 20050082233
    Abstract: A method for treating a subsurface formation with a ferrous compound, to reduce a contaminant therein, involves introducing into the subsurface formation a ferrous compound in combination with sodium hydrosulfite in an amount sufficient to substantially prevent precipitation, during the introducing, of a major portion of the ferrous compound. The method was found to be useful in the reduction of hexavalent chromium to trivalent chromium at a Superfund site.
    Type: Application
    Filed: October 14, 2004
    Publication date: April 21, 2005
    Inventors: Ralph Ludwig, Chunming Su