Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1991-09-09
1994-06-28
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204147, 204197, C23F 1300
Patent
active
053244052
ABSTRACT:
A circuit and method of cathodically protecting ferrous metal structures such as pipelines or well casings is described disposed in a conductive medium such as the ground. A pair of terminals are connected to an anode spaced from the structure and to the structure. A source of d.c. voltage is periodically connected across the terminal to cause current to flow to the anode and provide electrons at the surface of the structure to inhibit ferrous molecules from going into solution and damaging the integrity of the structure. The current flow due to the induced emf caused by the reactive inductions of the anode/cathode system is limited to inhibit damage to neighboring ferrous structures by providing a high impedance, e.g. an open circuit, between the input terminals during all or part of the time that the d.c. source is not supplying current to the anode/cathode load.
REFERENCES:
patent: 3612898 (1971-12-01), Doniguian et al.
patent: 3692650 (1972-09-01), Kipps et al.
Declaration of inventor Thaddeus M. Doniguian concerning experimental work performed by applicant Pursuant to Rule 37 CFR S1.56.
Jackson Harold L.
Tung T.
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