Electrolysis: processes – compositions used therein – and methods – Electrolytic material treatment – Metal or metal alloy
Reexamination Certificate
2006-08-25
2008-10-14
Bell, Bruce F (Department: 1795)
Electrolysis: processes, compositions used therein, and methods
Electrolytic material treatment
Metal or metal alloy
C205S725000, C205S738000, C205S740000, C204S196210, C204S196360, C204S196370
Reexamination Certificate
active
07435326
ABSTRACT:
A pipe coupling for joining two electrolyte-conveying pipes of electrochemically dissimilar metals and inhibiting galvanic corrosion resulting from the dissimilarity. A tubular pipe coupling has a pair of axially spaced protection electrodes mounted to its interior wall in electrical contact with the electrolyte. A control electrode is also mounted to the interior wall of the tubular pipe coupling between one of the pipes and the pair of protection electrodes. A current sensing circuit is connected to sense the galvanic current through the control electrode. A controllably variable source of electrical current is connected to vary the current through the protection electrodes. A negative feedback control circuit receives the sensed current as a feedback signal and controls the variable source to increase the electrical current through the protection electrodes and the electrolyte so that the sensed current is reduced thereby reducing the galvanic current in the electrolyte between the pipes. Preferably, the feedback control system has a reference input representing zero current through the control electrode and therefore drives the protection current to a magnitude that nulls the control electrode current.
REFERENCES:
patent: 5739424 (1998-04-01), Beavers
Beavers John A.
Tossey Brett Michael
Bell Bruce F
CC Technologies, Inc.
Foster Frank H.
Kremblas, Foster, Philiips & Pollick
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