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| Number | Title | Issue Date |
| 7141982 | Estimation of leakage rates using voltage measurements A current is injected in the vicinity of a liquid-containment facility of interest to create a measurable electrical potential field in the ground underlying the site. Voltage is measured at each of a plurality of electrodes and plotted as a function of time. The ra... | 11/28/2006 |
| 7111497 | Leak detection apparatus for lined vessels and method of use A leak detection apparatus detects leaks or premature wearing in a lined fluid filled vessel. A leak detection apparatus comprises a current density meter, a power supply, and a probe. The probe is inserted into the fluid filled vessel. The power supply supplies an ... | 09/26/2006 |
| 7038462 | Method and apparatus for electrical commoning of circuits Improved methods and apparatus is disclosed for electrical testing of electronic circuits such as those existing in microcircuit devices including chip carriers, printed circuit boards and substrates. The invention provides for the testing of the continuity of elect... | 05/02/2006 |
| 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 |
| 6931952 | Device for in-line measurement of properties of fluid flows in pipeline systems A device called “pill” is provided for in-line measurement of properties, such as pressure and temperature, in a fluid flow within a pipeline system. The device is small enough to travel in the medium of the pipeline system in an unrestricted manner. It has at l... | 08/23/2005 |
| 6650125 | Leak and pipe detection method and system A method and system for locating leaks of conductive fluids from non-conductive pipes and other structures or for locating non-conductive pipes or structures having conductive fluid contained therein, employ a charge generator to apply a time varying char... | 11/18/2003 |
| 6498496 | Device for detecting membrane leaks in a diaphragm pump Device to detect leaks and fatigue in membranes wherein the membrane consists of at least two membrane layers, and wherein at least one of the membrane layers includes a conductor on its inner surface that causes an alteration to a measured value in case ... | 12/24/2002 |
| 6229314 | Testing hypodermic syringes prior to automated filling A syringe subassembly comprised of a tubular syringe body having a front end provided with a forwardly projecting needle and fitted over the needle with a cap of a dielectric material is tested by juxtaposing an outer electrode with the cap, juxtaposing a... | 05/08/2001 |
| 6160406 | Condom testing apparatus A condom testing apparatus utilizing an arcing electrical current to detect holes and excessively thin wall areas in a condom mounted on a conductive testing mandrel, where the condom is passed across a conductive fabric member to test the main body and t... | 12/12/2000 |
| 6051977 | Method and apparatus for locating coating faults on buried pipelines A coating fault locating technique transmits a base electric signal from a power source to a buried metal pipe. A location of a coating fault in the buried pipe is detected by detecting a gradient of a changing magnetic field between two points spaced alo... | 04/18/2000 |
| 5963041 | Device and method for testing surgical instruments A testing device for detecting defects in insulation of electrosurgical instruments that includes an implement or wand having a distal end, an electrode for generating a spark adapted to detect a defect in the insulation, and mounting means for removably ... | 10/05/1999 |
| 5855721 | Non-destructive method of determining the position and condition of reinforcing steel in concrete A method of determining the position and condition of reinforcing steel embedded in concrete is described. The method is non-invasive. Electrodes are use to carry out the method by contacting the outer surface of the concrete. The method measures the impe... | 01/05/1999 |
| 5850144 | Method for detecting leaks in a membrane A leak-testable, fluid-impervious membrane is formed as a laminate of a conductive mesh scrim between upper and lower insulative polymeric resin layers. The scrim is preferably a screen formed of a metallic wire, such as aluminum. The polymeric resin is p... | 12/15/1998 |
| 5684405 | Wet/dry hot stick tester A wet/dry hot stick tester designed to provide a dry test of a hot stick by applying a voltage equivalent to 100 KV/ft to the hot stick, and to provide a wet test of a hot stick by applying a voltage equivalent to 75 KV/ft thereto. Output electrodes are p... | 11/04/1997 |
| 5680053 | Method for testing insulated electrosurgical instruments A testing device for detecting defects in insulation of electrosurgical instruments that includes an implement or wand having a distal end, an electrode for generating a spark adapted to detect a defect in the insulation, and mounting means for removably ... | 10/21/1997 |
| 5640096 | Elastomer leak detection apparatus Portable apparatus for inducing an alternating electrical gradient into an impounded liquid media and including, directionally sensitive, sensing apparatus for monitoring gradients established in the liquid to detect leaks at a liquid impermeable membrane... | 06/17/1997 |
| 5455507 | Method and apparatus for detecting leaks in electrically-insulative protective articles such as condoms, surgical gloves and the like using gaseous electrostatic ions A method and apparatus are described for detecting defects in a condom, protective glove or other similar product during manufacture. The product to be tested is situated on an electrically conductive mandrel, the shape of the mandrel corresponding to the... | 10/03/1995 |
| 5416420 | Method and apparatus for the verification of an electrical insulator device based on the analysis of the electric field along the insulator A method and apparatus for verifying the condition of an electrical insulator which is placed between two live conducting elements which are separated by the insulator. The insulator has a continuous electrically insulating core that may be covered with o... | 05/16/1995 |
| 5288168 | Method and apparatus for lining outdoor fluid containment areas to facilitate electrical leak detection An improved method and apparatus for waterproofing soil utilizing a flexible plastic sheet for providing a water barrier provides a system for readily detecting the presence of holes in the plastic material. The sheet includes a plastic layer which may be... | 02/22/1994 |
| 5254826 | Contact detecting device for positioning relatively movable elements A device for positioning a first and second conductive elements and, in particular, detecting contact at a gap therebetween without causing damage to either element. A pulse voltage, having a low duty, is applied to the gap. The occurrence of a contact is... | 10/19/1993 |
| 5204632 | Apparatus and method for detecting leaks in surgical and examination gloves An apparatus and method for detecting leaks in rubber or plastic articles such as surgical or examination gloves that, in general, are insulators against an electric current. The apparatus comprises a power source, first and second electrical leads, and s... | 04/20/1993 |
| 5184083 | Apparatus and method for the location of leaks by arrayed potentials and derived vectors A system of leak detection in an impoundment including a first impoundment layer containing a brine solution, a second impoundment layer positioned beneath the first impoundment layer and having a brine-filled space therebetween, a first electrode positio... | 02/02/1993 |
| 5084680 | Detection of exposed steel in the surface of reinforced concrete A method for detecting exposed steel in the surface of reinforced concrete, comprising the steps of: moving an electrode across an exposed surface of said concrete; connecting said electrode to one terminal of a power source; connecting the other terminal... | 01/28/1992 |
| 4998070 | Method and apparatus for testing a dielectric coating A method and apparatus for testing the integrity of the dielectric coating on an elongated member. The apparatus includes a pair of opposing, conducting surfaces that can be biased against the dielectric surface, a source of high voltge that can be switch... | 03/05/1991 |
| 4996486 | Method and apparatus for inspecting laminated iron core stacks for interlamination shorts In order to detect interlamination shorts (8 ) in the case of laminated core stacks, the core stack (1) is magnetized with an auxiliary winding. The iron surface (15) is scanned with a measuring coil arrangement (5) comprising two electrically separated, ... | 02/26/1991 |
| 4982163 | Method and a device for the determination of the condition of the insulation of an object coated with an electric insulation The invention relates to a method for the determination of the condition of the insulation of an object (1) made of an electrically conducting material, coated with an electrical insulation (2) and positioned in an electrically conducting medium. Accordin... | 01/01/1991 |
| 4962360 | Sensor for electrochemical measurement and method for diagnosing corrosion protective properties of metal surface coating by using the sensor A sensor for electrochemical measurement is disclosed which includes a chamber made of an electrically insulative material and having an open end portion, a super absorbent polymer material filled in the chamber and absorbing at a selected rate a liquid e... | 10/09/1990 |
| 4958128 | Method of examining an inside surface-coated metallic pipe and apparatus A process for detecting a poorly coated portion of an inside surface of a pipe coated with an insulation coat comprises the steps of providing a plurality of pigs on a conductor at predetermined intervals, preparing a running element provided with many el... | 09/18/1990 |
| 4912418 | Method and device for detecting the location of a fault within a dielectric layer of an electrically conducting pipe A method and a measuring device for localizing a damage in a dielectric corrosion resistant layer of a pipe line are described, especially for an enameled pipe line, through which an electrolytically conducting fluid is passed. Localization is achieved by... | 03/27/1990 |
| 4904935 | Electrical circuit board text fixture having movable platens A test fixture is provided for contacting selected terminals (10, 10') of an electrical assembly for testing by a test device (28). The fixture includes spaced-apart upper platen (2), middle platen (4), and lower platen (6) that are selectively movable ac... | 02/27/1990 |
| 4846936 | Method and apparatus for measuring metal exposure in resin covering portion in metal container and constituent member thereof Disclosed is a method for measuring the metal exposure in a resin covering area of a metal container or a constituent member thereof, which comprises contacting the resin covering area of the metal container or the constituent member thereof with a measur... | 07/11/1989 |
| 4839601 | Directional current finder An electrical detection system for locating a position of interest in a medium which is electrically conductive includes a signal generator, a source, a sink and at least two probes. The probes are disposed in the medium equidistantly spaced from either t... | 06/13/1989 |
| 4806849 | Method and apparatus for diagnosing degradation of coating film on metal material Method and apparatus for diagnosing degree of degradation of a coating film of a painted metal material by dividing the surface of the painted metal material into a number of small area zones, measuring impedance of the coating film at each of the zones t... | 02/21/1989 |
| 4771246 | Method for determining the location of a leak in a pond liner formed of electrically insulating material A system for determining the location of a leak in a pond liner made of electrically insulating material supported by a medium which is electrically conductive consists of a movable nozzle for directing a stream of an electrically conductive liquid agains... | 09/13/1988 |
| 4760343 | Apparatus for detecting defective insulators in an insulating column supporting an electrical conductor in a power circuit line A method and apparatus for detecting defective insulators in an insulating column supporting an electrical conductor in a power line. The column is made of a plurality of serially connected insulator members. Voltage present on the conductor supported by ... | 07/26/1988 |
| 4758792 | Method for utilizing a spherical dipole probe for detecting faults in high voltage transmission line insulators A method is provided for utilizing a nonintrusive, noncontacting electric field sensing device to detect faults in high voltage transmission line insulators. The electric field surrounding an unfaulted insulator is mapped using a spherical dipole to obtai... | 07/19/1988 |
| 4740757 | Method and apparatus for locating leaks in a multiple layer geomembrane liner A leak detection and location method and apparatus for detection of perforations in a obscure geomembrane liner is set forth. In a typical application, upper and lower liners are positioned contiguous to one another and a conducting liquid is placed betwe... | 04/26/1988 |
| 4725778 | Detecting resistance faults Resistance faults, for example across insulating joints of cathodically protected pipelines may be evaluated by comparing magnetic field strengths associated with a test current of predetermined frequency flowing into and away from the joint.... | 02/16/1988 |
| 4725785 | Directional potential analyzer method and apparatus for detecting and locating leaks in geomembrane liners A directional potential analyzer method and apparatus using a non-intrusive electrical measurement technique to obtain a precise location of a leak in a geomembrane liner. The method and apparatus can be used for detecting leaks in either a single layer o... | 02/16/1988 |
| 4719407 | Automated search apparatus for locating leaks in geomembrane liners An automated search apparatus is disclosed for detecting leaks in liquid impoundments usually defined by a geomembrane layer. A voltage gradient is created within the impoundment by means of a source electrode. The search apparatus contains pairs of elect... | 01/12/1988 |
