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| Number | Title | Issue Date |
| 7241374 | Pulsed electric field method and apparatus for preventing biofouling on aquatic surfaces An electrode system for preventing biofouling of a surface either is applied directly onto the surface of an aquatic vehicle or structure, if the surface is non-conducting; or is applied onto an insulating paint layer on the surface, if the surface is conducting; or... | 07/10/2007 |
| 7238263 | Corrosion tester A portable, handheld, automatic protection level interpreting cathodic protection meter for testing the level of protection being afforded to metallic structures protected by either sacrificial anode or impressed current cathodic protection systems, or both. The met... | 07/03/2007 |
| 7189319 | Axial current meter for in-situ continuous monitoring of corrosion and cathodic protection current First and second axial current meters (ACM) are mechanically connected to a well casing just above and below a corrosive zone and a master axial current meter (MACM) is connected to the casing at the earth's surface, the MACM periodically obtaining measurements of a... | 03/13/2007 |
| 7064459 | Method of inhibiting corrosion of a component of a marine vessel A method for inhibiting galvanic corrosion of marine propulsion components impresses an electronic current into the protected component and causes the protected component to act as a cathode in a galvanic circuit which comprises a conductor, such as a ground wire co... | 06/20/2006 |
| 7044075 | Marine vessel corrosion control system A marine vessel corrosion control system contemplates redundant protection for a marine vessel against the effects of galvanic corrosion. The vessel is equipped with typical zinc anodes interconnected together and attached to metallic components to be protected from... | 05/16/2006 |
| 6896779 | Corrosion sensor A system using tank corrosion sensors to provide for an overall assessment and monitoring of the electro-chemical corrosion and coatings condition in ships' tanks, and particularly in ships' seawater or compensated fuel tanks. The system includes reference half-cell... | 05/24/2005 |
| RE38581 | Pulsed cathodic protection system and method A cathodic protection system for protecting buried conducting structures, subject to corrosion such as well casings, pipe lines and the like, utilizes a plurality of pulsed D.C. current sources with the negative output terminal of each source connected to a separate... | 09/14/2004 |
| 6579429 | Antifouling system for structure exposed to seawater and heat exchanger A titanium sheet (4) serving as an anode-forming member is fixed on a tube plate (1a) of a heat exchanger (1) via a insulting sheet (5) and an insulating adhesive (6). The sheet (4) is coated with a film (3) of an electrochemically active, stable electric... | 06/17/2003 |
| 6511586 | Marine organism prevention system for structures in seawater An antifouling system (20) for a structure exposed to seawater has an anode forming member (4) bonded to the seawater-exposed surface to be wetted with seawater (15) of the structure via an insulating adhesive (6). The anode forming member 4 is coated wit... | 01/28/2003 |
| 6419816 | Cathodic protection of steel in reinforced concrete with electroosmotic treatment Combining an electroosmosis direct current (EP) applied at less than 1 mA/Mcm3 (milliamp per 1000 cm3 of concrete) with an anode placed adjacent an outer surface of reinforced concrete soaked with a substantially neutral saline solut... | 07/16/2002 |
| 6224742 | Pulsed cathodic protection system and method A cathodic protection system for protecting buried conducting structures, subject to corrosion such as well casings, pipe lines and the like, utilizes a plurality of pulsed D.C. current sources with the negative output terminal of each source connected to... | 05/01/2001 |
| 6197168 | Electrochemical stain prevention apparatus of submerged structure and process for producing submerged structure used in this apparatus An electrochemical stain prevention apparatus of a submerged structure comprising a submerged structure of which at least the stain prevention surface is formed of a conductive film that does not generate chlorine even by applying a potential of 5 V vs. S... | 03/06/2001 |
| 5785842 | Corrosion protection monitoring and adjustment system A system for monitoring and alternatively adjusting the electrical energy input and output of remotely located corrosion protection rectifiers on a section of a longer pipeline includes three elements. The first element is a monitoring unit which monitors... | 07/28/1998 |
| 5627414 | Automatic marine cathodic protection system using galvanic anodes An automatic system uses sacrificial galvanic anodes to to provide a controlled and optimum amount of cathodic protection against galvanic corrosion on submerged metal parts. Intermittently pulsed control circuitry enables an electro-mechanical servo syst... | 05/06/1997 |
| 5574317 | Device for compensation of an alternating voltage which occurs between a medium and a metallic pipeline disposed in the medium In a metallic pipeline (1) disposed in the ground, alternating voltages may be induced from adjacent transmission lines and cause corrosion. To reduce the risk of corrosion, an alternating current (i1) is caused by means of a compensating devic... | 11/12/1996 |
| 5541459 | Device for compensation of an alternating voltage which occurs between a medium and a metallic pipeline disposed in the medium In a metallic pipeline (1) disposed in the ground, voltages may be induced from adjacent transmission lines and cause corrosion. To reduce the risk of corrosion, voltages are induced in the pipeline with the aid of a transformer (8), which voltages counte... | 07/30/1996 |
| 5466353 | Electric power distribution system for active cathodic protection of reinforced concrete constructions An electric power distribution system permitting active cathodic protection of reenforced concrete structures includes a converter device converting a mains supply voltage to low voltage electrical power, a computer in close proximity to the converter dev... | 11/14/1995 |
| 5338417 | Cathodic corrosion protection for an aluminum-containing substrate Cathodic corrosion protection for surfaces of metallic substrates is provided by carrying out electrolysis, switching off the electrolysis, observing a control voltage and switching on the electrolysis again when the control voltage equals a specified cri... | 08/16/1994 |
| 5318678 | Method and apparatus for analyzing the state of protection against corrosion of a work under cathodic protection A study is made of the changeover time of the voltage between an electrode and a metal work piece buried in the ground and protected against corrosion by an electric current. For this study, it is intended momentarily to interrupt the circulation of the p... | 06/07/1994 |
| 5298794 | Electrical anticorrosion device for marine propulsion device This invention primarily relates to an electrical anticorrosion device for a marine propulsion arrangement. More particularly, the invention relates to a cathodic protection arrangement which is suitable for use with an inboard/outboard propulsion unit. A... | 03/29/1994 |
| 5139634 | Method of use of dual bed cathodic protection system with automatic controls This invention relates to a dual bed cathodic protection system with automatic controls and method of use utilizing an impressed cathodic protection anode assembly powered through a solar power supply in conjunction with a sacrificial cathodic protection ... | 08/18/1992 |
| 5077486 | Power supply for cathodic protection system A power module for a cathodic protection system is provided having a switch-mode power circuit and a synchronous switch assembly. The method of the invention comprises rectifying an alternating utility power signal with a power transformer and switch asse... | 12/31/1991 |
| 4894135 | Electrolyte IR voltage compensator for cathodic protection systems or the like There is disclosed a cathodic protection system current control apparatus incorporating an IR compensator circuit wherein the electric potential between a reference cell such as a copper-sulfate half-cell and the wall of a tank or other structure being co... | 01/16/1990 |
| 4828665 | Cathodic protection system using carbosil anodes Cathodic protection of vehicle bodies provides a capacitive charge on an anode which is attached to a painted surface. Moisture in contact with the painted surface spreads the charge. A minute current is established at holidays, protecting damp metal surf... | 05/09/1989 |
| 4826577 | Control system for electrochemical protection on submersible metal structures A method and device for automatic surveillance of electrochemical protection on submersible metal structures. The difference in electric potential between the steel structure and at least one electrode, in contact with the ambient water, is detected with ... | 05/02/1989 |
| 4780189 | Electronic control circuit for a cathodic protection system An electronic control circuit for a vehicle cathodic protection system is disclosed. A battery of the vehicle is utilized to supply electrical energy to the circuit. The circuit includes a first voltage comparator which compares the voltage level of the v... | 10/25/1988 |
| 4713158 | System for applied current cathodic protection of a structure The system includes means for cyclically putting into operation a circuit for controlling and regulating a DC generator connected between the structure to be protected which constitutes a cathode and the anodes of a group of anodes which are insulated fro... | 12/15/1987 |
| 4664764 | Cathodic protection of structures Method, system and apparatus for carrying out the cathodic protection of structures wherein evaluation of true current and true voltages at the counter electrode is carried out by an integration procedure which is timed in conjunction with the cross-over ... | 05/12/1987 |
| 4644285 | Method and apparatus for direct measurement of current density In a cathodic protection system for protecting a metal structure in contact with a surrounding electrolytic medium, method and apparatus are provided for directly measuring current density. A small metal sample cathode of a like material as the metal stru... | 02/17/1987 |
| 4528460 | Cathodic protection controller A control system (17) for cathodically protecting an outboard drive unit (11) from corrosion includes an anode (12) and a reference electrode (13) mounted on the drive unit (11). Current supplied to the anode is controlled by a transistor (20), which in t... | 07/09/1985 |
| 4383900 | Apparatus and method for measuring the IR drop free cathodic protection potential created by a rectifier and controlling rectifier operation to achieve a desired level thereof An electronic circuit for measuring the IR drop free potential of a cathodically protected structure includes a shunting transistor which is periodically pulsed on to shunt or electrically connect the output lines of a rectifier to force the voltage and c... | 05/17/1983 |
| 4255242 | Reference electrode IR drop corrector for cathodic and anodic protection systems In making measurements of the potential of a structure immersed in an electrolyte, which structure is being protected from corrosion by a cathodic or anodic protection system, serious errors are often introduced by the IR drop component induced by current... | 03/10/1981 |
| 4255647 | Water tank having electric heating element and cathodic corrosion protection An anticorrison protected small electric household water heating tank includes a metal tank having a passive anticorrosive layer provided on an inner wall thereof. A U-shaped electric immersion heating element is horizontally arranged in a lower region of... | 03/10/1981 |
| 4147608 | Impressed current cathodic protection An impressed current cathodic protection apparatus has an electromechanically actuated variable transformer providing a variable output voltage and shunt-connected current monitors to monitor the impressed current and to vary the transformer turns ratio t... | 04/03/1979 |
| 4080272 | Cathodic protection method and apparatus Method and apparatus for determining the true cathode polarization potential for automatically regulating the impressed current in a cathodic protection system.... | 03/21/1978 |
| 3953742 | Cathodic protection monitoring apparatus for marine propulsion device A cathodic protection system monitor is coupled to an impressed current cathodic protection circuit used for corrosion protection of a submerged marine drive. The cathodic protection circuit includes one or more anodes and a reference electrode mounted be... | 04/27/1976 |
