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| Number | Title | Issue Date |
| 5300929 | Method for delineating an anomalous geologic structure A method of using oriented seismic sensors to delineate the surface of a geologic unit having an anomalous velocity, such as salt dome is disclosed. Seismic sensors having three orthogonal axes of sensitivity are sealed in a housing and are attached to th... | 04/05/1994 |
| 5128898 | Method and apparatus for detecting orientation of downhole geophones A method and apparatus for detecting the orientation of downhole geophones are provided. A gamma ray source is secured to a casing enclosing a geophone such that the location of the gamma ray source with respect to the orientation of a geophone is known. ... | 07/07/1992 |
| 5112126 | Apparatuses and methods for making geophysical measurements useful in determining the deflection of the vertical A non-magnetic apparatus is disclosed for finding the deflection of the vertical. That apparatus has a device for finding an instrument spatial angle between a reference direction and an instrument characterization direction, and a device for finding a de... | 05/12/1992 |
| 4718170 | Apparatus and means for vertically aligning a hollow cylinder A vertical alignment apparatus has a light and a light fixture attached to a cable to be lowered into the cylinder to be aligned. A disk mounted on top of the light fixture and centered about the light fixture and the cable causes the light emitted from t... | 01/12/1988 |
| 4291978 | Apparatus for automatically determining the position at which a beam of light impinges on a target A rotating target contains an appropriately shaped section of photoelectric material which detects the position of a beam of light which is incident on the target. The position of the beam is determined in terms of its distance from the center of rotation... | 09/29/1981 |
| 4016655 | Boring rig alignment apparatus and method Methods and apparatus for vertical alignment of a borehole rig directly over a drilling site involve use of a camera placed in parallel orientation to the drilling mast or drill string and sighted in on the drill target, then allowed to swing free to the ... | 04/12/1977 |
