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| Number | Title | Issue Date |
| 7410563 | Method and apparatus for preventing corrosion of contact A method for preventing corrosion of a contact, includes comparing a potential of a signal line connected to the contact with a predetermined potential corresponding to the corrosion of the contact; flowing a corrosion-prevention current into the contact when a resu... | 08/12/2008 |
| 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 |
| 7225863 | Plate-type heat exchanger with anodic corrosion protection To protect a plate-type heat exchanger (1) against corrosion due to the attack of sulfuric acid, it is proposed in accordance with the invention that the region through which flows sulfuric acid has at least one metal cathode (16, 17) and one reference... | 06/05/2007 |
| 7227110 | Prevention of ice formation by applying electric power to a liquid water layer A first electrode is separated from a second electrode by an interelectrode space. The interelectrode space does not exceed 3 mm, and preferably does not exceed 100 μm. Liquid water fills the interelectrode space, thereby electrically connecting the first electrode... | 06/05/2007 |
| 7192513 | Cathodic protection junction box current equalizer A cathodic protection junction box current equalizer has a plurality of output terminals each being connectable through a variable resistors to an anode, the resistors being controlled such that the corresponding anode outputs a desired current. ... | 03/20/2007 |
| 7027957 | Current interrupter assembly A method for determining the influence of one of a plurality of cathodic protection circuits along a pipeline includes switching one of a plurality of cathodic protection circuits off, while the remainder of the plurality of cathodic protection circuits are left on,... | 04/11/2006 |
| 6871014 | Water treatment system and water heater with cathodic protection and method A water heater comprising a housing defining a water heating chamber, at least a portion of the housing being metallic, and a metallic heating element disposed in the housing for heating the water, wherein the metallic portion of the housing and a metallic heating e... | 03/22/2005 |
| 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 |
| 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 |
| 6173669 | Apparatus and method for inhibiting fouling of an underwater surface A marine fouling prevention system comprises two conductive surfaces and a device that alternates the direction of electric current between the two surfaces. The current is caused to flow through sea water in which the two surfaces are submerged or partia... | 01/16/2001 |
| 6046515 | Process and apparatus for preventing oxidation of metal An apparatus for prevention of corrosion in metal objects uses a pad having a conductive facing, a dielectric substrate and an adhesive, attached to a metal body being protected from corrosion. The metal body and the negative terminal of a source of DC vo... | 04/04/2000 |
| 5747892 | Galvanic isolator fault monitor A system and method for testing and monitoring the operation of a galvanic isolator. The galvanic isolator is positioned between shore ground and boat ground to prevent the flow of destructive galvanic currents between the shore ground and the boat ground... | 05/05/1998 |
| 5643424 | Apparatus for the prevention of fouling and/or corrosion of structures in seawater, brackish water and/or fresh water A device and method for preventing fouling and/or corrosion of the exposed surfaces of a structure which is in contact with seawater, brackish water, fresh water, or a combination of these. The system includes using a structure having an exposed zinc-cont... | 07/01/1997 |
| 5513694 | Anodic protection method and system A heat exchanger and process for use with a corrosive fluid, such as sulphuric acid, having an anodic protection system for protecting the acid-contacted surfaces wherein the anodic protection system has a plurality of elongated cathodes of such cross sec... | 05/07/1996 |
| 5407549 | Electronic corrosion protection system An automobile corrosion protection apparatus incorporating, in combination, a electronic cathodic protection system for impressing a flow of electrons through the metal body of an automobile, and an electrically conductive auto body sealant for facilitati... | 04/18/1995 |
| 5395491 | Method for preventing sea water cells from being destroyed by biofouling This invention relates to a method and means for preventing or greatly reducing biological growth on the cathode (7, 11) of a sea water cell (1) which is based on electrolytic reaction between oxygen, water and a metal anode (6, 10), and which is arranged... | 03/07/1995 |
| 5366604 | Solar powered cathodic corrosion protection system A cathodic protection system employs a photovoltaic panel for generating current through the metallic body to be protected from corrosion and a ground bed in response to sunlight. A battery is also charged by the photovoltaic panel during daytime, and the... | 11/22/1994 |
| 5350494 | Arrangement for cathodic protection Arrangement for cathodic protection from corrosion of metal bodies surrounded by an electrolytic medium, comprising a metal anode body which is to be introduced into the medium and has a lower (electric) quiescent potential in the medium than the bodies t... | 09/27/1994 |
| 5344531 | Prevention method of aquatic attaching fouling organisms and its apparatus This invention relates to a method of preventing or controlling aquatic attaching fouling organisms which comprises covering aquatic organisms attaching portions on the surfaces of submerged structures or intake facilities with a plurality of mutually ins... | 09/06/1994 |
| 5324405 | Pulse cathodic protection system 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 ... | 06/28/1994 |
| 5141607 | Method and apparatus for the removal of chlorides from steel reinforced concrete structures A method and apparatus for the removal of chlorides from steel reinforced concrete utilizes an electrode with a rectifier impressing a voltage between the steel of the concrete and the electrode. The electrode and the surrounding concrete are saturated co... | 08/25/1992 |
| 5102514 | Cathodic protection system using carbosil anodes An automotive cathodic protection apparatus applies direct current to an integrated circuit timer and power controller, which generates times output pulses. An output charge storing capacitor connects the power source and timer to a vehicle body.... | 04/07/1992 |
| 4975560 | Apparatus for powering the corrosion protection system in an electric water heater A common source of DC potential is utilized to simultaneously provide power to the protective anode in an electrically heated hot water heater and to the circuit used to bias the heating element jacket to reduce the current load the jacket would otherwise... | 12/04/1990 |
| 4972066 | Method and apparatus for reducing the current drain on the sacrificial anode in a water heater The adverse effects of the exposed metal jacket on a heating element in an electric water heater on the life and performance of a protective anode are eliminated or substantially reduced with the system that imposes a low voltage differential between the ... | 11/20/1990 |
| 4950372 | Cathodic protection system using carbosil anodes An automotive cathodic protection apparatus applies direct current to an integrated circuit timer and power controller, which generates timed output pulses. An output charge storing capacitor connects the power source and timer to a vehicle body.... | 08/21/1990 |
| 4823072 | Measurement of the polarized potential of buried pipeline having impressed current cathodic protection A method for detecting the polarized potential of a buried pipe which is cathodically protected by rectified alternating current impressed upon the pipe. Each rectified protection current is periodically pulsed to an off state for a precise pulse duration... | 04/18/1989 |
| 4798658 | Device for the cathodic corrosion-protection of metal parts A device for the cathodic protection of metal parts in which electrodes and voltage source are used to charge positively an electrolyte in relation to the metal surface which is to be protected. The electrodes (1) are so designed that they extend linearly... | 01/17/1989 |
| 4767512 | Process and apparatus for preventing oxidation of metal by capactive coupling An effective process of preventing the oxidation of metal objects by capacitive coupling is disclosed. An electric current is impressed into the metal object by treating the metal object as the negative plate of a capacitor. This is achieved by a capaciti... | 08/30/1988 |
| 4752368 | System for protecting metal structures against corrosion A corrosion protection system comprises a circuit which includes rectifiers connecting the structure being protected to an alternating current source for producing negative current flow from the source to the device. An impedance is connected in circuit w... | 06/21/1988 |
| 4588022 | Anodic protection system and method An anodic protection system particularly useful in heat exchangers for cooling sulphuric acid, in which the cathode projects through both ends of the heat exchanger and a negative potential is applied to both ends of the cathode. The potentials are contro... | 05/13/1986 |
| 4586562 | Plate and frame heat exchanger assembly with anodic protection A plate heat exchanger assembly is provided having an anodic protection system comprising a plate heat exchanger frame, a plurality of heat exchanger plates mounted to the frame and means for selectively applying a voltage across the plates whereby during... | 05/06/1986 |
| 4311576 | Electric corrosion preventing apparatus An electric corrosion preventing apparatus with a circuit having an indication lamp for indicating an operation state of the apparatus, which is used for preventing an inside wall of a hot-water receptacle, such as a water heater and a boiler, from being ... | 01/19/1982 |
| 4211625 | Impressed current cathodic protection system for submersible downhole pumping assembly Cathodic protection of a deep well submersible pumping assembly against the corrosive effect of electrolysis is achieved by providing a DC voltage source at the downhole pumping assembly, the negative terminal of the source being electrically connected to... | 07/08/1980 |
| 4051436 | Apparatus for and method of measuring polarization potential of a metallic structure An improved testing device and method to measure the degree of polarization potential on the interface of a metal structure and its environment where said structure is protected against corrosion through a cathodic protection system. The testing device in... | 09/27/1977 |
| 4036716 | Method to prevent the formation of incrustations on working electrodes in electrode steam generators or the like and a means for performing the method The present invention relates to electrically heated steam generators and means for preventing and removing incrustations due to hard water in such generators. According to the invention this is achieved by means of a superimposed direct current the polar... | 07/19/1977 |
| 3951207 | Heat exchange arrangement A heat exchange arrangement for use with chemically aggressive fluids has a source of direct current. Walls are provided which define a flow path for a fluid which is to undergo a temperature change, and at least a part of the walls is composed of a metal... | 04/20/1976 |
