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4996487 |
Apparatus for detecting failure of thermal heaters in ink jet printers
According to the present invention, a method and device for detecting failure of heating elements in various jets of a thermal jet printing device is provided. The printing device which includes a...
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4996472 |
Passive superconducting quench detection sensor
The present invention provides a passive superconducting sensor for quench detection in a superconducting coil. The sensor consists of a first circuit electrically connected to two voltage taps of...
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4982154 |
Method of engagement of electrical contacts to pipe members
A scheme for rapidly connecting and rapidly disconnecting a large number of point contacts onto a pipe surface is taught. The scheme involves pressing sharply pointed pin contacts onto the pipe...
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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...
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4888546 |
Device for measuring seam resistance
A portable seam resistance measuring apparatus having a housing with one or more flat exterior surfaces, a number of apertures, an indicator at the midpoint of the flat surface, two or more current...
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4887025 |
Method and apparatus for the non-destructive checking of spot welds between metal sheets produced by electric welding
A electrical current of predetermined strength is passed through a spot weld by a first pair of electrodes. The electrical potential difference between two points, respectively upstream and...
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4857831 |
Borehole casing diagnostic apparatus and method
Apparatus and method for investigating a borehole casing. The preferred apparatus generally comprises: a housing which is connected to a cable; sets of electrodes, each set being axially spaced...
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4835465 |
Testing apparatus for plated through-holes on printed circuit boards, and probe therefor
A testing device for testing the quality of through-hole plating of a printed circuit board employs probes having pyramidical tips, with the edges of the probe tips contacting the ends of the...
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4835466 |
Apparatus and method for detecting spot defects in integrated circuits
Spot defects are detected utilizing an apparatus which comprises a meander structure formed in a high resistivity material on a substrate. The meandor includes intermediate segments, the ends of...
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4833396 |
Lead frame short tester
Disclosed herein is a method and apparatus for performing a non-invasive electronic testing of hybrid circuit packages before components are mounted within the package and connected to the...
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4829235 |
Four-terminal connector for measuring resistance of a pyrotechnic initiator
A four-terminal electrical connector device (40) for testing and measuring unknown resistances of initiators (11) used for starting pyrotechnic events aboard a Space Transportation System. The...
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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,...
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4806496 |
Method for manufacturing photoelectric conversion devices
Photoelectric conversion devices are manufactured at high yield by repairing the devices during the final steps of the manufacuturing process. Short current paths resulting from the formation...
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4806850 |
Method and apparatus for analyzing the corrosive effect of the soil and its environment on a buried metallic structure and their application to the locating of said effect
The invention relates to the continuous or discontinuous analysis of the corrosive effect of the soil and the environment on a buried metallic structure (such as an underground gasoline storage...
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4804906 |
Method and apparatus for well casing inspection
An oil and gas well casing inspection tool is disclosed. The casing inspection tool comprises a body; inner and outer contact rollers extending from the body; means for generating a current between...
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4789829 |
Method and apparatus for determining RE gasket shielding effectiveness
A method and apparatus for determining the shielding effectiveness of an RF gasket installed between two mating metallic surfaces of equipment or a structure by creating a time varying current flow...
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4764970 |
Method and apparatus for detecting cracks
The invention scans potential measurement terminals on the surface of a structural member to measure a potential distribution on the surface, detects the direction of a crack from the potential...
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4724428 |
Thermocouple jacket monitor
A thermocouple jacket monitor is disclosed. The thermocouple monitor is constructed utilizing an inner jacket and an outer jacket with a replaceable conductive metal strip sandwiched between the...
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4724376 |
Low voltage AC ohmeter
An AC ohmeter is adapted for testing insulated pipe flanges where flammable substances are involved. It employs a low frequency, low voltage oscillator and includes a precision rectifier. The...
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4683419 |
Method and apparatus for detecting faults in a structure by measuring voltage drop between surface points thereof
A method for monitoring structures by measuring electrical quantities including subjecting an electrically conducting component to an a-c current with a predetermined frequency in a given direction...
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4667149 |
Precision nondestructive testing of metals
A large number of applications exists for measuring the resistivity or other properties of ferrous and nonferrous metals, including matching alloys to ensure weld compatibility and measuring weld...
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4656595 |
Method and a device for monitoring large metal structures
A method and device for monitoring large structures so as to detect defects, e.g. cracks. An electric current is supplied to a steel structure which is equipped with contact points between which...
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4651086 |
Apparatus and method for determining the resistance of a coil connection of an electric motor winding
A method, and apparatus, for determining the resistance of the electrical connections between coils and the bars of a commutator for electric motors as well as the resistance of the coils...
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4648124 |
Apparatus for locating passive intermodulation interference sources
An apparatus for locating passive interference sources by using a pair of different RF signals in conjunction with an acoustic signal to generate intermodulation products in metal-to-metal...
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4639569 |
Weld resistance measuring apparatus for a spot welder
Apparatus provides for measuring weld resistance of each of a group of weld sites that are subject to variation with respect to weld resistance. The apparatus includes circuitry for inducing a flow...
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4636715 |
Digital display ohmmeter
An apparatus and method is provided for measuring the continuity and resistance of electric circuits, particularly electric wire circuits used in blasting, in the presence of spurious voltages due...
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4581576 |
Nondestructive method for profiling imperfection levels in high resistivity semiconductor wafers
A method is disclosed for nondestructively profiling the uniformity of imperfection level densities in a semiconductor wafer. Resistance profiles from the wafer are obtained using an opaque spot...
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4577086 |
Monitoring in-service resistance of AC conductors
A method and apparatus of monitoring the resistance characteristics of a circuit carrying an alternating current or a current having an alternating component is described. The apparatus includes...
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4565965 |
Method and apparatus for locating roof leaks in flat roofs
There is provided a method and apparatus for locating leaks in flat roofs, particularly in flat roofs covered with a gravel layer, plants or the like, and wherein it is provided that a moisture...
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4546310 |
Electrical continuimeter
Electrical continuimeter device for checking the electrical continuity of a conducting layer covering a structure having conducting and non-conducting parts, said conducting layer being covered by...
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4464823 |
Method for eliminating short and latent short circuit current paths in photovoltaic devices
Systems and methods for detecting and eliminating latent and existing short circuit current paths through photovoltaic devices of the type including at least one semiconductor region overlying a...
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4451970 |
System and method for eliminating short circuit current paths in photovoltaic devices
Systems and methods for detecting and eliminating short circuit current paths through photovoltaic devices of the type including at least one semiconductor region overlying a substrate and a layer...
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4404516 |
System for detecting leaks from liquid-containing reservoirs and conduits
A leak detection and location system is disclosed for chemical storage ponds, conduits and tanks containing environmentally harmful materials. The leak detection system comprises a network of...
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4402127 |
Method of manufacturing a logic circuit including at least one field-effect transistor structure of the normally-off type and at least one saturable resistor
A method of manufacturing a logic circuit having at least one field effect transistor connected in series with at least one saturable resistor, wherein an active semiconductor layer is formed with...
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4313087 |
Apparatus for detecting electrically conductive coatings on documents
This apparatus tests the genuineness of a document carrying anticounterfeit protection in the form of a usually invisible, electrically conductive coating on at least part of a surface. The...
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4266185 |
Probes and apparatus for and methods of measuring crack depths
The invention relates to probe for use in measuring crack depth in a conducting workpiece, apparatus including the probe for measuring crack depth and methods of measuring crack depth. The probe...
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4178543 |
Analyzing electrical circuit boards
Circuit board analysis system, featuring, in various aspects, a probe having three equally spaced tips to simultaneously contact a straight portion of a mounted IC lead, circuitry to monitor...
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4134059 |
Method and apparatus for measuring the corrosion current of an immersed structure provided with a cathodic protection device
The invention relates to a method and apparatus for measuring the corrosion current of an elongated structure immersed in a fluid and provided with a cathodic protection device, the apparatus...
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4101827 |
Method and apparatus for determining the location of a leak in a pipe buried underground
The location of one or more leaks in a pipe made from an electrically insulating material and which is buried in an electrically conductive medium, typically a pipe buried underground, is...
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4006063 |
Method for measuring surface characteristics of metals and metalloids
A process applicable to metal and metalloid surfaces for detecting and determining the boundaries of stressed areas and areas exhibiting chemical variations involves ascertaining at a number of...
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3988669 |
Automatic control and detector for three-terminal resistance measurement
A device is provided for automatic control and detection in a three-terminal resistance measuring instrument. The invention is useful for the rapid measurement of the resistivity of various bulk...
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3916304 |
Method for nondestructive testing of weld clusters
Disclosed is a method for the nondestructive testing of weld clusters having at least a first and a second weld joining metal elements including the steps of injecting a current into one of the...
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3855531 |
METHOD OF TESTING THE SEALS OF FOOD CONTAINERS AND CONTAINERS SUITABLE THEREFOR
A thin-walled flexible container containing sterilised foodstuff is tested by measuring the electrical conductivity of a path from the interior of the container through the seal to the outside. A...
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3803485 |
INDICATING COATING FOR LOCATING FATIGUE CRACKS
Crack propagation through a substantially electrically nonconductive coating bonded to an electrically conductive base is monitored or detected by providing a multitude of reservoirs filled with an...
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3721898 |
APPARATUS FOR DETECTING LEAKAGE FROM OR RUPTURE OF PIPES AND OTHER VESSELS CONTAINING FLUID UNDER PRESSURE
A frangible covering encircling the vessel in sealed relationship has insulated electrically conductive means, preferably a plurality of spaced wires, distributed over the area of the covering. A...
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3699436 |
REMOTELY CONTROLLABLE DEFECT DETECTOR OF ELECTRIC RESISTANCE TYPE
A remotely controllable defect detector, of the electric resistance type, includes a relatively elongated control rod, a guide frame supported at one end of the rod and a contact assembly including...
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3636441 |
METHOD OF MEASURING CRACK DEPTHS IN ELECTRICALLY CONDUCTIVE METAL WORKPIECES USING CURRENT PROBES WITH VOLTAGE PROBES LOCATED BETWEEN CURRENT PROBES BY MEASURING THE MINIMUM POTENTIAL DIFFERENCE BETWEEN THE VOLTAGE AND CURRENT PROBES
A method for determining in a nondestructive manner the existence, the depth and the length of cracks in an electrically conductive metal workpiece such as a steel plate or a steel pipe, by means...
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3621386 |
METHOD OF DETERMINING BONDING IN A COMPOSITE SUPERCONDUCTOR
Bond quality between a superconductor and a coating thereabout of normal material having high electrical conductivity at superconducting temperatures is measured by interrupting the electrical...
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3621193 |
POSITIVE CONTACT RESISTANCE SOLDERING UNIT
A positive contact resistance soldering unit which has a relay therein, which is operated by a foot switch for selectively coupling a milliohmeter to the electrodes for measuring the resistance...
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3599095 |
METHOD OF AND MEANS FOR TESTING AN ELECTRICAL BOND TO DETERMINE ITS HIGH FREQUENCY IMPEDANCE
A method of and means for testing an electrical bond between two conductors, such as a ground plate and a radio frequency shielded enclosure bonded to the plate, to determine the high frequency...
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