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| Number | Title | Issue Date |
| 4481517 | Echometry device and method Devices and methods are disclosed for remote measurment of temperature (and velocity) profiles in a fluid medium (i.e., the atmosphere and/or oceans). Each device, herein called an echometer, and method are capable of providing remote measurements of temp... | 11/06/1984 |
| 4470123 | Microwave ice accretion meter A system for indicating ice thickness and rate of ice thickness growth on surfaces is disclosed. The region to be monitored for ice accretion is provided with a resonant surface waveguide which is mounted flush, below the surface being monitored. A contro... | 09/04/1984 |
| 4430653 | Earth probing radar system A ground probing radar method and apparatus which is effective to view the earth in advance of coal mining activity provides visual display of a coal seam and particular discontinuities that may lie therein. The system operates in the frequency range of 1... | 02/07/1984 |
| 4410237 | Method and apparatus for shaping electromagnetic beams The intensity profile of a beam of electromagnetic waves such as a laser beam is shaped by means of a diffraction grating and/or prism in the beam path. In one embodiment, beams exhibiting Gaussian energy intensity profiles undergo an energy redistributio... | 10/18/1983 |
| 4408156 | Sheet articles of non-conductive material marked for identification purposes, and method and apparatus for identifying such articles A method of producing an identification signal for a sheet article of non-conductive material, which article is marked for identification purposes by the incorporation therein of a small quantity of very thin conductive fibers which are capable of absorbi... | 10/04/1983 |
| 4364008 | Focusing probe for moisture measurement device In an apparatus for measuring the moisture content of a target material, the apparatus has means for generating an electromagnetic wave of a microwave frequency. The electromagnetic wave is guided by a guiding means. Detecting means are provided for detec... | 12/14/1982 |
| 4331957 | Transponder for use in locating avalanche victims A transponder adapted to be carried on the body of a person for use in locating avalanche victims is designed for cooperation with a search-transmitter and includes a receiver having a passive non-linear element which, by distortion, produces a higher har... | 05/25/1982 |
| 4297699 | Radar drill guidance system The present invention comprises a short-pulse radar guidance tool which determines borehole-to-roof and borehole-to-floor distances along a coal seam by measuring the travel times of electromagnetic pulses transmitted from the tool and reflected back to a... | 10/27/1981 |
| 4245191 | Method and apparatus for detecting and measuring inclusions in subsoil A method and apparatus is described comprising a transmitter for transmitting an unmodulated carrier of selected wave length into the ground and a receiver adapted to receive reflected signals. Circuitry is described for producing narrow pulses from the t... | 01/13/1981 |
| 4218678 | Synthetic pulse radar including a microprocessor based controller This invention relates to pulse radar detection of targets in extended media, including natural phenomena such as oil, coal and ore deposits within the earth. In particular, this invention relates to a pulse radar system employing a synthetic pulse formed... | 08/19/1980 |
| 4167736 | Fluid flow measurement A dielectric aerial is disposed in contact with a dielectric liquid, and projects microwave radiation thereinto. The reflected radiation is received by the aerial, and the flow rate of the liquid given by the Doppler frequency shift between the projected ... | 09/11/1979 |
| 4161731 | Thickness measurement system An FM radar for the measurement of coal thickness wherein an FM transmitter is modulated by the combination of two signals, one, for example, being of a frequency of 100 Hz, and the other being of a frequency of 15 Hz. A horn-type antenna is used which is... | 07/17/1979 |
| 4126860 | Wire detector A pulser circuit produces pulses of broadband radio frequency (RF) electromagnetic wave energy that are coupled through a hybrid to a transmit-receive antenna which is contiguous with the ground. If a transmitted pulse is incident on a conductive wire in ... | 11/21/1978 |
| 4075555 | Electronic phase comparison apparatus for the remote measurement of layer thickness A continuous wave, phase measurement system which provides at least an order of magnitude improvement in accuracy over modulated carrier systems is disclosed for the determination of the thicknesses of layered targets consisting of a known number of diele... | 02/21/1978 |
| 4072941 | Underwater monitoring Apparatus for detecting the presence of an underwater object measures variations in the input impedance of a monopole antenna to provide data on the object. A sweep generator supplies a first electrical signal of varying frequency for transmission as an e... | 02/07/1978 |
| 4072942 | Apparatus for the detection of buried objects Apparatus for the detection of buried objects comprising a broadband, high resolution short pulse transmitter and a bistatic or monostatic noncontacting antenna for radiating the transmitted signal through the ground for reflection from a buried object, a... | 02/07/1978 |
| 4062010 | Underground pipe detector An apparatus and method wherein an electrical impulse source transmits a radar-type signal through an antenna into the ground and is reflected by a target. The reflected signal or echo is detected by the antenna and an analog-to-digital converter converts... | 12/06/1977 |
| 4008469 | Signal processing in short-pulse geophysical radar system Signal processing techniques and apparatus for use in short-pulse geophysical radar systems to improve signal-to-noise ratio, reduce r.f. interference, improve resolution and reduce ambiguities.... | 02/15/1977 |
| 3967282 | Underground pipe detector An apparatus and method wherein an electrical impulse source transmits a radar-type signal through an antenna into the ground and is reflected by a target. The reflected signal or echo is detected by the antenna and an analog-to-digital converter converts... | 06/29/1976 |
