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| Number | Title | Issue Date |
| 7881153 | Steerable paravane system for towed seismic streamer arrays A paravane for a seismic acquisition system includes a float, a frame suspended from the float, deflectors affixed to the frame, and means for coupling a tow rope to a lead-in functionally extending between a forward end and an aft end of the frame. The paravane inc... | 02/01/2011 |
| 7424367 | Method for predicting lithology and porosity from seismic reflection data Method for predicting lithology and porosity of subsurface rocks from seismic reflection data. The seismic data is inverted to yield elastic properties of the rocks such as the compressional and shear impedances. A rock physics model is built to relate porosity, the... | 09/09/2008 |
| 7293520 | Control system for positioning of a marine seismic streamers A method of controlling a streamer positioning device (18) configured to be attached to a marine seismic streamer (12) and towed by seismic survey vessel (10) and having a wing and a wing motor for changing the orientation of the wing. The metho... | 11/13/2007 |
| 7222579 | Control system for positioning of marine seismic streamers A method of controlling a streamer positioning device (18) configured to be attached to a marine seismic streamer (12) and towed by seismic survey vessel (10) and having a wing and a wing motor for changing the orientation of the wing. The metho... | 05/29/2007 |
| 7167412 | Apparatus for steering a marine seismic streamer via controlled bending A marine seismic streamer steering device comprises at least two hinged sections pivotally coupled to each other and connected between two adjacent sections of the seismic streamer, and a bend control unit that controls bending of the hinged sections relative to the... | 01/23/2007 |
| 7131013 | Power supply control system and storage device for holding data just prior to the occurence of an error A computing section controls a hot swap circuit, and DC/DC converters based on binary data from an ADC and an interrupt signal from respective comparing sections of a voltage detecting circuit. If the interrupt signal is input from any one of the respective comparin... | 10/31/2006 |
| 7080607 | Seismic data acquisiton equipment control system A method of controlling a streamer positioning device configured to be attached to a marine seismic streamer and towed by a seismic survey vessel and having a wing and a wing motor for changing the orientation of the wing. The method includes the steps of: obtaining... | 07/25/2006 |
| 7049765 | Transformer for dimmer switch or on/off switch and method of use The present invention achieves the above objects, among others, by providing, in a preferred embodiment, a transformer system for use with either a dimmer switch or an on/off switch, including: a transformer; a load connected to the transformer; a first tap connecte... | 05/23/2006 |
| 6975560 | Geophysical method and apparatus A method and apparatus is disclosed for performing a seismic survey below the surface of a body of water and on the seabed. In one embodiment, a plurality of seismic data receivers are removably loaded in a carrier located above the surface of the water and the carr... | 12/13/2005 |
| 6971934 | Autonomous liquid filled buoy A buoy system includes a sea-bed pump station having separate reservoirs of lighter-than-water and heavier-than-water liquids. The reservoirs are in fluid communication with peristaltic pumps that are operated via a preprogrammed control within the station. A buoy h... | 12/06/2005 |
| 6950748 | Methods and systems for resistivity anisotropy formation analysis Techniques for determining a formation property by simplifying various two-geological-layer or multi-geological-layer models into a multi-electrical-layer model. A volume fraction of a layer in a multi-electrical-layer model is determined for an anisotropic region (... | 09/27/2005 |
| 6898146 | Screwless inner race for streamer cable connector An inner race for a streamer cable connector. The inner race includes first and second curved sections with a screwless fastener for clamping the two sections together about the streamer cable. The two curved sections may be hinged at first ends so that the inner ra... | 05/24/2005 |
| 6456565 | System for undersea seismic prospecting A system for underwater seismic prospecting or exploration on seafloors, especially deep seafloors, including streamers designed to contain the measurement devices and to lie on the seafloor, in the form of an inner tube that is non-stretching and non-com... | 09/24/2002 |
| 6173803 | High amplitude sound wave generator A method and device for generating a high amplitude sound wave is provided. The device includes a housing having an open end. A piston is slidably disposed in the open end of the housing and forms a chamber for holding a pressurized liquid. The pressurize... | 01/16/2001 |
| 6028817 | Marine seismic system with independently powered tow vehicles The present invention discloses a marine seismic system with a control system and at least one powered (manned or unmanned) tow vehicle with at least one seismic apparatus or system attached thereto, the at least one powered tow vehicle for selectively to... | 02/22/2000 |
| 6019652 | Buoyancy adjustment Device for the adjustment of buoyancy of a seismic cable comprising a main part (1) adapted to firm, integrated mounting into a chosen point in the length of the cable, the main part (1) comprising fastening means (3,4) for one or more weight or buoyancy ... | 02/01/2000 |
| 5946270 | Over power supply voltage cut-off circuit An over power supply voltage cut-off circuit includes: a power supply voltage supplying path switching part for switching a supplying path of the power supply voltage provided to the power consumption type of load from the power supply voltage generating ... | 08/31/1999 |
| 5459695 | Seismic cable with reusable skin A seismic cable segment is provided having a longitudinal seam for access into the seismic cable, a cable skin lock, a flotation tube for varying the buoyancy of the seismic cable, external stress members isolated from the inside of the seismic cable, and... | 10/17/1995 |
| 5404339 | Retriever for a seismic streamer cable A marine seismic streamer cable retriever is activated promptly when the cable and its attached retriever exceed a pre-selected safe depth. In an alternative scenario, an electronics module in the cable retriever monitors the presence of through-cable com... | 04/04/1995 |
| 5379267 | Buoyancy control system A buoyancy control system is disclosed for maintaining a buoyant vehicle at a controlled depth by jettisoning either a heavy liquid or a light liquid. The control system monitors the depth of the buoyant vehicle and determines the direction and magnitude ... | 01/03/1995 |
| 5278804 | Device for weighting of streamer cables For the balancing of seismic streamer cables (1) circular ring or sleeve-shaped weighted bodies are adjustably attached at desired intervals on the cable. The weighted bodies can be resilient for temporarily enlarging an opening (3) to receive the cable t... | 01/11/1994 |
| 5185726 | Continuously-filled floatation apparatus The invention provides a floatation apparatus for maintaining a longitudinal object at a constant depth below the water surface in a body of water. Several airtight chambers are connected in a serial connection to form a string of air tight chambers. A on... | 02/09/1993 |
| 4951265 | Oil fill procedure for seismic marine streamer A method for reducing signal degradation in a foam covered hydrophone used in seismic marine streamers. Said method comprises purging the foam streamer body with a fluid which is at least partially miscible with an oil used to fill said foam body. Thereaf... | 08/21/1990 |
| 4831599 | Float for use in seismic surveys of the sea bed A float for use in seismic surveys of the sea bed supports a plurality of seismic pulse transmitters (6) which are suspended on lines (7) beneath the float (1). At a distance from the front end of the float (1), on one sidewall thereof, a fastening device... | 05/16/1989 |
| 4745583 | Marine cable system with automatic buoyancy control A marine cable system including one or more elongated cable sections whose buoyancy may be independently controlled. Each section is associated with a pump and a variable volume, elongated bladder. In one embodiment, one reservoir containing buoyant fluid... | 05/17/1988 |
| 4716553 | Float for use in seismic surveys of the sea bed A float for use in seismic surveys of the sea bed supports a plurality of seismic pulse transmitters (6) which are suspended on lines (7) beneath the float (1). At a distance from the front end of the float (1), on one sidewall thereof, a fastening device... | 12/29/1987 |
| 4290124 | Remote control cable depth control apparatus An apparatus to remotely control the depth in the water of a marine cable, such as a streamer of seismic geophones or hydrophones towed behind an exploration boat during seismic surveys of submerged formations, and maintain the cable at a desired depth. T... | 09/15/1981 |
| 4135141 | Marine seismic streamer with depth sensor calibrating means A marine seismic streamer section for a towed underwater streamer containing a buoyancy regulating fill liquid and the usual hydrophones, strain cables, signal wires and the like housed in a generally cylindrical tubular jacket sealed at its ends against ... | 01/16/1979 |
