Patents by Inventor Joyce May Whang

Joyce May Whang 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 for remediating contaminated soils
    Patent number: 6492572
    Abstract: A method is disclosed for the degradation of persistent contaminants in soil. The method provides the combination of a stabilizing reagent and a degradative reagent where both are admixed into a contaminated soil site for the reduction of permeability at the site and the chemical degradation of the contaminant over time.
    Type: Grant
    Filed: March 5, 2001
    Date of Patent: December 10, 2002
    Assignees: E. I. du Pont de Nemours and Company, Texas A&M University Systems
    Inventors: Bill Batchelor, Alison Marie Hapka, Godwin Joseph Igwe, Richard Howard Jensen, Michael F. McDevitt, Dale S. Schultz, Joyce May Whang
  • Method for Remediating contaminated soils
    Patent number: 5789649
    Abstract: A method is disclosed for the degradation of persistent contaminants in soil. The method provides the combination of a stabilizing reagent and a degradative reagent where both are admixed into a contaminated soil site for the reduction of permeability at the site and the chemical degradation of the contaminant over time.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: August 4, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Bill Batchelor, Alison Marie Hapka, Godwin Joseph Igwe, Richard Howard Jensen, Michael F. McDevitt, Dale S. Schultz, Joyce May Whang
  • Method for precipitating a solid phase of metal
    Patent number: 5730873
    Abstract: The invention herein provides a method for the time delayed precipitation of a solid phase of metal from a low pH, metal salt solution comprising adding to the metal solution a substrate, such as an amide, and an enzyme, such as an amidase, which will react with the substrate, which causes a rise in pH upon the reaction of the substrate with the enzyme. The rise in pH causes the metal to precipitate from solution. The precipitated metal is useful for emplacing metal hydroxides for providing sorptive material useful for removing contamination from groundwater.
    Type: Grant
    Filed: August 27, 1996
    Date of Patent: March 24, 1998
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Alison Marie Hapka, Joyce May Whang, Jeffery Scott Thompson