1. D.J. Degenkolb, F.J. Scobey, Method and apparatus for recovery of heavy metal ions from dilute aqueous solution, US Patent 4137290 (1979).
2. N.M. Martyak, B.F. Monzyk, H.H. Chien, Apparatus and methods for treating electroless plating baths, US Patent 5277817 (1994).
3. G. Griffin, Plating rinse water treatment, US Patent, 5932109 (1999).
4. D.D. Spatz, Metal reclamation process and apparatus, US Patent 3637467 (1972).
5. D.E. Hewitt, T.J. Dando, Water recycle treatment system for use in metal processing, US Patent, 3973987 (1975).