Patents by Inventor Gerard Grayson

Gerard Grayson 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).

  • Chloride leaching of iron-based, heavy metal-containing sludges
    Patent number: 4888053
    Abstract: A method for removing and recovering toxic heavy metal contaminants from an iron-bearing sludge is provided. The method comprises one or more cycles of a two step, controlled chloride leach comprising a first non-acidic chloride leaching solution and a second acidic chloride leaching solution, wherein said toxic heavy metals are separated from said sludge and said iron-bearing sludge is a substantially non-hazardous material.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: December 19, 1989
    Assignee: Union Oil Co. of California
    Inventors: Gerard Grayson, Morton M. Wong