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| Number | Title | Issue Date |
| 6845564 | Level monitoring sensor apparatus, solid structure sensor apparatus, and pendulum sensor apparatus An apparatus for monitoring level variations in a given orientation of a structure, comprises a support portion secured to a structure to be monitored as a function of the given orientation in an adjustable position with respect to the horizon. A balancing arm hangs... | 01/25/2005 |
| 6831877 | System and method for determining an azimuth of a seismic energy source The present invention provides a system for, and method of determining an azimuth of a seismic energy source. In one embodiment, the system includes a directional assembly having a mount configured to be coupled to a seismic energy source, a rotatable mass assembly ... | 12/14/2004 |
| 5801636 | Method and apparatus for seismic tornado detection A tornado warning system having means for monitoring seismic waves of a predetermined frequency range including long-period seismic waves and short-period seismic waves. The seismic waves are associated with and produced in the ground as a result of an ap... | 09/01/1998 |
| 5791058 | Infrastructure inspection method A method of determining whether a structure such as a bridge has been severely damaged by an earthquake or other disturbance such as a flood. The method is designed to be carried out by unsophisticated persons immediately after such disturbance so that un... | 08/11/1998 |
| 5451164 | Method and system for geophysical and geologic modeling A method and system for using sonography to image the internal structure of geophysical and geologic models are disclosed. The sonography system includes a wand having a plurality of piezoelectric elements at an active surface thereof, each coupled to dri... | 09/19/1995 |
| 5379025 | Method and apparatus for seismic tornado detection A method and apparatus for detecting the seismic signal generated by a tornado and providing timely warning of the tornado's approach. The invention involves the use of a geophone or velocity transducer (3) to detect the seismic surface waves generated by... | 01/03/1995 |
| 5001682 | Method and apparatus for detecting seismic events A seismographic sensor is constructed from a D'Arsonval movement. The elements of the movement include a coil suspended in the field of a permanent magnet and a pointer attached to the coil. A weight is attached to the pointer and acts as an inertia eleme... | 03/19/1991 |
| 4768175 | Apparatus for measuring the intensity of a seismic shock This is an apparatus for measuring the intensity of a seismic shock applied to the apparatus. The apparatus includes an enclosure in which is a system of weights movable in response to an applied mechanical shock, and connected to a movable transmission m... | 08/30/1988 |
| 4615022 | Symmetrically-suspended vertical-swing long-period pendulum means Two sector-shaped pendulums are supported by crossed leaf springs at two axes on the same horizontal level respectively in a symmetrical manner so that each pendulum can swing about the axis thereof, sector-shaped surfaces of the pendulums being connected... | 09/30/1986 |
| 4300135 | Seismic alarm system An alarm system is provided for detecting a seismic tremor and for generating an audio and/or visual alarm signal which varies depending upon the magnitude of the seismic tremor. In the preferred form of the invention, the alarm system comprises a free ru... | 11/10/1981 |
| 3973326 | Direct readout distance measuring device A device for measuring distances is provided wherein, after calibration of the device, a cursor mounted on an elongate movable wand is moved to the point whose distance from a datum point is to be determined. A resistor extends along the length of the wan... | 08/10/1976 |
| 3931609 | Three-dimensional seismic display The present invention relates to a model, and the making of such model, of subsurface features of the earth, utilizing a plurality of processed seismic sections spaced apart in a manner representing the disposition of the seismic profiles along seismic su... | 01/06/1976 |
