Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Reexamination Certificate
2008-05-06
2008-05-06
El-Arini, Zeinab (Department: 1792)
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
C134S025100, C134S026000, C134S027000, C134S028000, C134S029000, C134S040000, C134S041000, C134S010000
Reexamination Certificate
active
07368019
ABSTRACT:
A technique is provided to precludes elution of the nickel by infallibly removing the nickel adhering to the inner surface of plumbing hardware, realize a treatment for efficient (treating temperature, treating duration, etc.) preclusion of both or either of lead and nickel and perform a neutralizing treatment on the varying fluid used in the treatment for precluding elution, thereby rendering the fluid usable as industrial water, permitting a generous cut in cost and allowing thorough observance of the influence on the environment. A method for precluding elution of lead and nickel from a plumbing device made of a copper alloy that includes a valve and a tube coupling, includes washing at least a liquid-contacting part of the plumbing device of a copper alloy containing both or either of lead and nickel with a cleaning fluid incorporating therein nitric acid and hydrochloric acid as an inhibitor under conditions of a temperature and a duration permitting effective removal of both or either of lead and nickel, thereby performing at least one of deleading treatment and nickel-removing treatment for a surface of the liquid-contacting part and causing the hydrochloric acid to form a coating film on the surface of the liquid-contacting part to thereby effectively precluding elution of both or either of the lead and nickel from the surface of the liquid-contacting part in the presence of the coating layer.
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El-Arini Zeinab
Kitz Corporation
Wenderoth , Lind & Ponack, L.L.P.
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