Sherry A Pierce

US Patent:

55911161, Jan 7, 1997

Filed:

Jun 9, 1995

Appl. No.:

8/488946

Inventors:

Sherry A. Pierce - Dallas TX

Assignee:

Entact Corporation - Irving TX

International Classification:

A62D 300
B09B 300

US Classification:

588256

Abstract:

This invention relates to the treatment of contaminated materials including soils and solids to reduce its permeability, 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 such as monocalcium phosphate either alone or in combination with Portland Cement.

US Patent:

57886237, Aug 4, 1998

Filed:

Mar 15, 1996

Appl. No.:

8/617481

Inventors:

Michael Kell Studer - Flower Mound TX
Philip J. Pisani - Irving TX
Sherry A. Pierce - Dallas TX

Assignee:

Entact, Inc. - Dallas TX

International Classification:

A62D 300
B09B 300

US Classification:

588256

Abstract:

This invention relates to the treatment of contaminated materials including soils and solids to reduce its permeability, 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 a single additive or combination of additives including calcium carbonate; reactive magnesium carbonate; reactive calcium magnesium carbonate; magnesium oxide; magnesium hydroxide; ammonium phosphate; diammonium phosphate; phosphoric acid; boric acid; metallic iron; polyphosphoric acid; sodium carbonate; sodium bicarbonate; calcium oxide; calcium hydroxide; sodium hydrogen phosphate; triple super phosphate (TSP); superphosphate and polyphosphoric acid.

US Patent:

56741766, Oct 7, 1997

Filed:

Oct 7, 1996

Appl. No.:

8/726622

Inventors:

Sherry Ann Pierce - Dallas TX

Assignee:

Entact, Inc. - Irving TX

International Classification:

A62D 300
B09B 300

US Classification:

588256

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.