Patents by Inventor Sherry Ann Pierce

Sherry Ann Pierce 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 treatment of solid waste to minimize heavy metals
    Patent number: 5674176
    Abstract: This invention relates to the treatment of contaminated materials including soils and solids, and in particular to chemical treatment of waste or solids containing high levels of heavy metals such as lead, by treating the waste or solid with an additive from the group consisting of phosphoric acid, monocalcium phosphate monammonium phosphate and diammonium phosphate either alone or in combination with Portland cement.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: October 7, 1997
    Assignee: Entact, Inc.
    Inventor: Sherry Ann Pierce