Removing heavy metal ions from water

US3944415A · kind A · utility

Assignee

• The United States of America, as represented by the Secretary of Agriculture · US

Inventors

• John M. Randall · Fremont, US
• Earl Hautala · Richmond, US
• Anthony C. Waiss, Jr. · Pinole, US
• Judith A. Kuhnle · Alameda, US

Key dates

• Filing date: Mar 5, 1975
• Grant date: Mar 16, 1976
• Expiry date: Mar 5, 1995

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Heavy metal ions are removed from water by contact with formaldehyde-modified nut waste or tree bark.