Did You Know...
...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4697137 | Method of nondestructively establishing an earth gradient for cable fault locating A fault is located in an insulated electrical conductor buried in earth by establishing a voltage gradient through the earth emanating from the fault, and thereafter sensing the direction of the gradient to locate the fault. The voltage gradient is establ... | 09/29/1987 |
| 4689552 | Method and device for detecting insulation damage to a buried object A method of and an apparatus for detecting damage to a buried object which includes the steps of (a) providing a buried object extending in a longitudinal direction which has an electrically insulating layer over a conductive member, (b) connecting one te... | 08/25/1987 |
| 4649335 | Equipment for locating a signal reflection point in a transmission line In an equipment for locating a reflection point in a transmission line a recording is obtained of the impulse response of the path of the echo produced by a transmission signal based on a reference signal x(n) constituted by binary sequences of duration N... | 03/10/1987 |
| 4617511 | Electrode probe assembly for glass lined metal vessels An electrode probe assembly for monitoring and finding fault in the glass lining of metal vessels, pipes or the like, characterized by a cup-shaped electrode with an insulated stud inserted through a hole in the wall of a mounting member. An insulating ga... | 10/14/1986 |
| 4570231 | Fault finder A fault finder for locating faults along a high voltage electrical transmission line. Real time monitoring of background noise and improved filtering of input signals is used to identify the occurrence of a fault. A fault is detected at both a master and ... | 02/11/1986 |
| 4375050 | Portable automatic multiple test system for multi-pair cables A portable, compact test set for multi-pair cables having connectors, where the connectors are mated to adapters in the test set and pulses are generated which sequentially test each pair for open and short conditions, using transistor to transistor logic... | 02/22/1983 |
| 4342958 | Automatic test equipment test probe contact isolation detection method A method for determining whether test probes of a test fixture on an automatic test equipment (ATE) device are in contact with the intended test points on an electronic assembly under test. The undetected failure of the test probes to contact the test poi... | 08/03/1982 |
| 4292586 | Testing of circuit arrangements Testing of thin film modules is facilitated by employing predetermined test procedures, so that analysis of the results is facilitated; and the test signals are supplied to, and the corresponding output signals are supplied from, the module terminals, a p... | 09/29/1981 |
| 4282479 | Test apparatus for locating shorts during assembly of electrical buses A test apparatus for locating electrical shorts that is especially suited for use while an electrical circuit is being fabricated or assembled. A ring counter derives input pulses from a squarewave oscillator. The outputs of the counter are fed through tr... | 08/04/1981 |
| 4139818 | Circuit means for collecting operational errors in IC chips and for identifying and storing the locations thereof The present disclosure describes electronic circuits for use with test and diagnostic (T&D) means to collect errors orignating within integrated circuit (IC) chips during their operation in a system environment. Moreover, the circuits employ counters and ... | 02/13/1979 |
| 3968426 | Method of A.C. insulation testing utilizing a variable inductive reactor in parallel with a test specimen Insulation is tested by the method of connecting a variable inductive reactor across a voltage supply in parallel with a test specimen. The inductance of the reactor is varied until its reactance equals that of the sample as indicated by the supply curren... | 07/06/1976 |
