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| Number | Title | Issue Date |
| 7239122 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 07/03/2007 |
| 7221139 | Multi-channel radiometer imaging system A radiometer system includes a housing and an RF board contained within the housing. Balanced radiometer channels receive an unknown signal and known reference. Each balanced radiometer channel includes at least one quadrature hybrid and amplifier circuit to provide... | 05/22/2007 |
| 7199570 | Multi-channel radiometer imaging system A radiometer includes a housing and an RF board carried by the housing. A hybrid and amplifier circuit receives an unknown signal and a known reference signal. A switch receives signals as inputs from the hybrid and amplifier circuit and switches between the inputs.... | 04/03/2007 |
| 7126366 | Semiconductor test apparatus Good device PASS/FAIL determination is realized by measuring timings of both signals, i.e., a cross point of differential clock signals CLK and a data signal DATA output from a DUT, and obtaining a relative phase difference between both signals. A semiconductor test... | 10/24/2006 |
| 7043366 | Method for enhancing depth and spatial resolution of one and two dimensional residual surfaces derived from scalar potential data An improved method is disclosed for collecting or assembling scalar potential data measurements that are to be subsequently prepared as a surface representation for analysis via frequency domain transform filters. Measurements are made over a geographic reference re... | 05/09/2006 |
| 6708126 | Method and system for measuring current A current sensing system including a carrier strip, the carrier strip disposed so as to be associated with a current carrying conductor, wherein when an electrical current flows through the conductor, the electrical current flowing through the conductor creates a ma... | 03/16/2004 |
| 4835474 | Method and apparatus for detecting subsurface anomalies A method and apparatus for collecting measurements on the surface of the earth in a form which can be processed to obtain enhanced resolution of subsurface resistivity anomalies in the earth's geologic structure. The system of the preferred embodiment uti... | 05/30/1989 |
| 4467283 | Electrical geophysical exploration system with addressable current probes A geophysical exploration system uses a single conductor cable connected to a current source, the cable having a number of earth probes coupled to it at spaced points with addressable switching units. The switching units are activated in sequence so that ... | 08/21/1984 |
| 4446434 | Hydrocarbon prospecting method with changing of electrode spacing for the indirect detection of hydrocarbon reservoirs A method and apparatus for electromagnetic hydrocarbon exploration which is accomplished by implanting at least two pairs of electrodes into the ground. One pair transmits a signal into the earth, and the other pair receives the signal. With proper proces... | 05/01/1984 |
