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| Number | Title | Issue Date |
| 4124090 | Bounceless seismic wave generator A seismic wave generator constructed of fungible high density elements contained within a flexible envelope is dropped to impact upon the ground and generate seismic waves for seismic investigations. The non-rigid construction minimizes or eliminates boun... | 11/07/1978 |
| 4118994 | Movable device for generating acoustic shear waves in the earth A device for generating shear waves in the earth for seismic prospectives, comprising a target member coupled with the earth, a vehicle carrying a mass and means for driving and guiding the mass along a direction perpendicular to the striking surface of t... | 10/10/1978 |
| 4116299 | T-bar base plate for a seismic signal transducer An improved base plate for a vibratory seismic signal generator consists of a plurality of parallel T-bars welded together. The flange of every adjacent T-bar is inverted with respect to its neighbors.... | 09/26/1978 |
| 4114722 | Broadband seismic energy source A vibratory seismic energy source capable of generating significant energy over a broad frequency band. The vibrating baseplate and associated structure are designed to have minimum weight while still retaining sufficient structural integrity to permit th... | 09/19/1978 |
| 4108270 | Hydraulic stabilization system to position and isolate a seismic vibrator A hydraulic stabilization system which comprises pairs of hydraulic cylinders in fluid communication connected between the vehicle support structure of the vibrator and the vibrator ground coupling plate. This configuration maintains the ground coupling p... | 08/22/1978 |
| 4106586 | Hydraulic vibrator The present invention relates to an improved hydraulic vibrator of the type which includes a fixed double rod piston and a reaction mass reciprocally disposed around the piston forming a hydraulic cylinder therein so that when hydraulic fluid is introduce... | 08/15/1978 |
| 4103756 | Stress wave generator Method and apparatus are provided for generating in situ in a zone of earth surrounding a bore hole both longitudinal and shear waves and of predetermined relative amplitude, entirely mechanically, avoiding use of explosives, and with relatively low power... | 08/01/1978 |
| 4068210 | Seismic vibrator phase detector A phase detector for detecting the phase difference between a pilot reference signal and a feedback signal generated by movement of a vibrator baseplate. The detector includes a phase shifter for providing a delayed reference signal phase-shifted from the... | 01/10/1978 |
| 4064964 | Seismic signal generating apparatus A seismic signal generating apparatus comprising a vehicle including a rearwardly extending bed, a ram-supporting framework pivotally mounted on the bed for pivotation about a horizontal axis, a ram slidably and reciprocably mounted in the framework, and ... | 12/27/1977 |
| 4050540 | Movable device for generating acoustic shear waves in the earth Device for generating shear waves in the earth for seismic prospecting, comprising means for striking with a mass a target-member coupled to the earth, said means including means for lifting and shifting said mass with respect to the target member, an ele... | 09/27/1977 |
| 4034246 | Variable vibrating motor A variable vibration motor includes a rotor shaft having a fixed weight and a movable weight mounted thereon. Adjustable means are provided on the motor casing for adjusting the movable weight to various rotational positions about the rotor shaft, and man... | 07/05/1977 |
| 4026383 | Gyroscopic vibrator A gyroscopic vibrator provides a new vibrational energy source for applications such as reflection seismology and shake tables. A gyroscopic mass is rotated at a high angular velocity about a shaft. A control force imparts an oscillatory angular displacem... | 05/31/1977 |
| 4014403 | Vibratory apparatus for use in seismic exploration In a variable frequency seismic vibrator including an earth coupling plate, means for generating a reaction impedance, and an energy source for generating reciprocating movement of the coupling plate relative to the reaction impedance, the reaction impeda... | 03/29/1977 |
| 4011924 | Device for producing mechanical waves A device for generating sound waves for use in shallow terristrial seismology incorporates a percussion mass, a motor for driving the percussion mass to strike the ground for intermittent contact and adjustable to vary the frequency of impact, and a sensi... | 03/15/1977 |
| 4006795 | Means for seismic prospecting from bulk liquid carriers Apparatus for conducting seismic reflection surveys from oil tankers or other bulk liquid carriers in the course of their normal journeys. Seismic sources and detector apparatus are mounted in the ballast tanks. Pulse compression techniques may be used, a... | 02/08/1977 |
| 3999626 | Apparatus and seismic method A seismic generator for communicating from either above or below the surface of the earth is disclosed. The generator includes a system of eccentrically weighted masses such as, for example, unbalanced flywheels, which can be rotated to produce a seismic ... | 12/28/1976 |
| 3983957 | Method and apparatus for creating seismic waves in the earth A mass positioned above the earth and having downward extensions, which may include wheels, resting on the earth. One or more closed chambers having two parts vertically reciprocable with respect to each other, one part pressing on the earth, the other pa... | 10/05/1976 |
| 3979715 | Method and system for achieving vibrator phase lock An improved controller for vibratory seismic energy sources insures that the energy imparted to the ground by the source is in phase with the reference signal. Phase lock is achieved in a manner which minimizes the effects of the attendant frequency disto... | 09/07/1976 |
| 3934673 | Vibrator systems for generating elastic waves in the earth This abstract describes vibrator systems for generating elastic waves in the earth, in which an actuator has a mechanical output drive means responsive to an electrical oscillatory signal, the drive means operates a variable volume compartiment filled wit... | 01/27/1976 |
