Coating processes – With post-treatment of coating or coating material – Coating material recirculation or regeneration
Reexamination Certificate
2007-03-27
2010-11-16
Bareford, Katherine A (Department: 1715)
Coating processes
With post-treatment of coating or coating material
Coating material recirculation or regeneration
C427S438000, C427S443100
Reexamination Certificate
active
07833583
ABSTRACT:
An electroless nickel plating bath is provided that utilizes hypophosphite ions as a reducing agent and is substantially free of sulphate and sodium ions. Spent nickel in the plating bath is removed using an ion exchange resin and the remaining effluent solution is usable for manufacturing fertilizer compositions. The nickel is processed for inclusion back into the plating bath. Thus, the process of the invention allows for the indefinite use of the solutions without discharging hazardous waste.
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R. W. Anderson et al., “Electroless Nickel Bath Recovery by Cation Exchange and Precipitation,” 1991, pp. 233-241, XP002562171, Retrieved from the Internet: URL:http://www.p2pays.org/ref/21/20249.pdf, Retrieved on Jan. 7, 2010.
P.T. Bolger et al., “Investigation into the Rejuvenation of Spent Electroless Nickel Baths by Electrodyalisis,” Environmental Science & Technology, vol. 36, 2002, pp. 2273-2278, XP002562172.
Bray Paul
Pearson Trevor
Bareford Katherine A
Carmody & Torrance LLP
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