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| Number | Title | Issue Date |
| 6870795 | Acoustic source array system module for underwater operation which can be installed on a motorized boat A small boat or launch such as a motorized reinforced hull inflatable boat provides a platform for an acoustic source array of airguns. The array is made up as a ladder structure in which the airguns are disposed horizontally between vertical support and umbilical l... | 03/22/2005 |
| 6771561 | Sonar system especially for shallow water application such as in littoral environments In order to optimize detection of targets from a broadband return, a multiplicity of narrow bands are matched-filter processed simultaneously in parallel. The band or bands which provide the best joint combination of target and propagation in response are used for t... | 08/03/2004 |
| 6606958 | Towed acoustic source array system for marine applications A marine towed array has a plurality of tow bodies of positive buoyancy each containing a marine acoustic source, such as a vibrator source. Each tow body uses a reel containing an electro-mechanical tow cable connecting the sources, whereby reeling and u... | 08/19/2003 |
| 6378951 | Vibratory pavement breaker An electrohydraulic pavement breaker system having cavities (28, 30) which are filled with hydraulic fluid (oil) or gas, and which provide mass spring system which is resonant at a frequency which is especially adapted for breaking and rubblizing concrete... | 04/30/2002 |
| 5995452 | System for generating and transmitting acoustic signals underwater An array system, which provides a unipolar acoustic impulse with a broad spectral response underwater, utilizes a vertical array of airgun or electrical spark sources whose individual peak source strengths are essentially constant over the array length, b... | 11/30/1999 |
| 5841733 | Acoustic source array system for underwater operation An improved acoustic source array system is provided by the invention to generate acoustic signals underwater. The system has an array of acoustic signal sources, such as air guns, towable while underwater behind a surface vessel. The array includes a plu... | 11/24/1998 |
| 5515055 | System for processing returns from a target from transmissions containing repeated signals to detect the doppler velocity of the target A signal processing system of reduced complexity over conventional banks of matched filters for each Doppler velocity of interest is responsive to a transmission which is in the form of a train of repeated Doppler invariant signals which are preferably ph... | 05/07/1996 |
| 5378951 | Friction welder which produces orbital motion and drive therefor An electromagnetically actuated friction welder produces orbital motion at interfaces between parts (usually of thermoplastic material) to bond the parts by fusion generated by friction. This welder can also be operated alternatively to produce reciprocat... | 01/03/1995 |
| 5277744 | Friction welder having a drive which produces orbital motion An electromagnetically actuated friction welder produces orbital motion at interfaces between parts (usually of thermoplastic material) to bond the parts by fusion generated by friction. This welder can also be operated alternatively to produce reciprocat... | 01/11/1994 |
| 5212489 | Echo ranging system for detecting velocity of targets using composite doppler invariant transmissions Target velocity and range are measured with high resolution in an echo ranging system (sonar or radar) using composite Doppler invariant signals consisting of at least two segments, such as "rooftop" or "vee" HFM signals, such composite signals having amb... | 05/18/1993 |
| 5212490 | Echo ranging system for detecting velocity and range of targets using composite doppler invariant-like transmissions with suppression of false targets False target (reverberation, clutter, etc.) detection is suppressed in an echo ranging system (sonar or radar) in which target velocity and range are measured using a composite Doppler invariant-like signal having at least two segments, such as are presen... | 05/18/1993 |
| 5160393 | Friction welder having an electromagnetic drive which produces orbital motion An electromagnetically actuated friction welder produces orbital motion at interfaces between parts (usually of thermoplastic material) to bond the parts by fusion generated by friction. This welder can also be operated alternatively to produce reciprocat... | 11/03/1992 |
| 4758997 | Method and apparatus for the generation and transmission of signals for echo location and other signaling purposes, particularly in geophysical exploration A transmission from a hydroacoustic source, especially for underwater geophysical exploration, is generated in accordance with two binary codes (provided by two pulse trains or sequences having two levels and which provide a spectrum of harmonically relat... | 07/19/1988 |
| 4753316 | Seismic source A water gun seismic source for use in underwater environments has a sleeve valve (100) for opening a jet aperture (37, 101) to enable jets of pressurized water to be emitted for the generation of a seismic signal. The water is pressurized by a drive pisto... | 06/28/1988 |
| 4729066 | Method and apparatus for the generation and transmission of signals for echo location and other signaling purposes, particularly in geophysical exploration A transmission which requires only a single source to transmit is generated in accordance with a code which is binary (a pulse train having two levels which produces a specific harmonic line spectrum). The pulses are generated by pulse time modulation of ... | 03/01/1988 |
| 4722417 | Seismic wave generation by a downhole source A method and apparatus for downhole source generation of seismic waves of adjustable frequency by isolating a volume of liquid in a bore hole and cyclically varying the volume by a hydraulically operated transforming piston which varies the pressure of th... | 02/02/1988 |
| 4718970 | Apparatus for stress relief and edge sealing of welded joints in plastic parts In order to stress relieve exposed portions of plastic welds, and thereby reduce susceptibility of such welds to solvent-induced crazing and cracking, the welded parts are formed with flanges extending outwardly therefrom. These flanges are at least parti... | 01/12/1988 |
| 4695987 | Hydroacoustic apparatus A hydroacoustic transducer for generating and applying acoustic energy to a load coupling structure has a hydroacoustic amplifier with a driver stage and a power stage. The power stage includes a valve, which obtains high power conversion efficiency by op... | 09/22/1987 |
| 4663206 | Stress relief and edge sealing of welded joints in plastics parts In order to stress relieve exposed portions of plastic welds, and thereby reduce susceptability of such welds to solvent-induced crazing and cracking, the welded parts are formed with flanges extending outwardly therefrom. These flanges are at least parti... | 05/05/1987 |
| 4632214 | Seismic source for use underwater A seismic source drives one or more jets of high velocity water into an underwater environment and then terminates the jets by means of a valve member, the motion of which is controlled to obtain precisely timed high energy seismic pulses to provide refle... | 12/30/1986 |
| 4628493 | Sensor system with time division multiplexing telemetry A seismic array containing a large number of seismic sensors, which may be optical hydrophones, has successive sections, each of which contains a subarray of sensor channels, interconnected by a fiber optic signal transmission line via telemetry modules. ... | 12/09/1986 |
| 4601768 | Method and apparatus for treating plastic welds to relieve stresses therein To relieve stresses in a plastic weld which may weaken the weld and increase its susceptibility to solvent-induced crazing or cracking, forces are applied to the weld zone (the interface between welded parts) after it has cooled to solid condition, but pr... | 07/22/1986 |
| 4601927 | Welding of plastic parts Joints between thermoplastic parts are friction welded (e.g., as by vibration welding) or otherwise thermally welded in such a manner that a non-uniform temperature distribution results during welding which effectively blocks flash flow from the edge of t... | 07/22/1986 |
| 4569412 | Seismic source A seismic source operable in deep bore holes, and especially suitable for acoustic well logging and geophysical exploration, produces a controlled-spectrum seismic impulse. The source has a hammer which is hydraulically cocked through a hydraulic transfor... | 02/11/1986 |
| 4509170 | Time division multiplex transmission of submultiplex sequences of signals from sections of a chain of data acquisition units Time Division Multiplex (TDM) telemetry of submultiplex sequences of signals which may be obtained from successive sections of sensors in a sensor array are transmitted synchronously by locking generators in each section, which determine the time slots in... | 04/02/1985 |
| 4381137 | Optical fiber mode separation systems When a multimode optical fiber is deformed in accordance with an input signal to be sensed, light from lower order core modes is coupled to higher order core modes. A lens assembly is provided which separates the light in the higher order core modes from ... | 04/26/1983 |
| 4313192 | Optical transducer array system An array of optical waveguide transducers, especially suitable for use in a multi-channel hydrophone seismic streamer, contains optical waveguides which are deformed in response to the parameter being sensed (underwater acoustic energy in the case of the ... | 01/26/1982 |
| 4294513 | Optical sensor system An optical transducer with an optical waveguide having two paths for the propagation of light is deformed in response to acoustical pressure variations or other parameters to be sensed to modulate the amplitude of the light propagated along the two paths ... | 10/13/1981 |
| 4207962 | Methods and apparatus for use in generating and transmitting acoustic signals Methods and apparatus describedmaximize, within a predetermined frequency band, the continuous or near-continuous transmission of broadband acoustic power into a medium having a finite tensile strength such as water or earth. Such methods and apparatus al... | 06/17/1980 |
| 4204278 | Methods and apparatus for the generation and transmission of signals for echo location and other signalling purposes, as in geophysical exploration Quasi periodic pulse trains are generated and swept in repetition frequency over an octave. Spectral harmonics of the pulse trains which prevent the trains from having a constant or "flat" power spectrum over a frequency range much greater than an octave ... | 05/20/1980 |
| 4187917 | Pile driver The driving power and driving rate of a pile driver hammer is increased without increasing the overall weight of the hammer through the use of a hydraulic spring transformer which is disposed between the ram and the pile in the housing of the hammer and p... | 02/12/1980 |
| 4188610 | Method of and apparatus for the generation and transmission of signals for echolocation and other signalling purposes, such as in geophysical exploration Methods and apparatus are described for generating and transmitting signals in accordance with a sequence which defines the time relationship of the signals. Each signal has a band width covering several octaves and may be a pulse. During a transmission i... | 02/12/1980 |
| 4166507 | Percussive drilling apparatus A hydraulic rotary percussive drill which is adapted to operate as a drill for installing rock bolts in mines is described. The drill is configured so that the shank (which holds the drill steel and bit) forms a right angle with the impact mechanism, ther... | 09/04/1979 |
| 4155287 | Hydraulically operated impact devices Hydraulic actuation of a device for delivering impact energy to a load, such as a pile driver, is provided by a hydraulically operated oscillator having a piston which is reciprocal in a cylinder under hydraulic forces developed by pressurized hydraulic f... | 05/22/1979 |
| 4153135 | Apparatus for the generation of acoustic signals in marine environments A source is described capable of generating acoustic signals under water at high cycling rates suitable for providing seismic signals of controlled amplitude and spectral shape and with precise timing for geophysical exploration. The source has a pair of ... | 05/08/1979 |
| 4147228 | Methods and apparatus for the generation and transmission of seismic signals Methods and apparatus for generating and transmitting seismic signals for the purpose of seismic exploration are disclosed. The signals are force pulses shaped to have a spectrum constrained to the range of frequencies which are necessary for penetration ... | 04/03/1979 |
| 4143585 | Impact tool An impact tool is described which is capable of developing percussive forces for rock drilling, pile driving, seismic exploration and other repetitive high force applications. The tool contains a hammer and a valve which may be hydraulically actuated so a... | 03/13/1979 |
| 4131178 | Seismic source for use under water A seismic source is described which drives one or more jets of high velocity water into an underwater environment and then abruptly terminates the jets. The momentum of the free jet columns generate vapor cavities in the water away from the housing of the... | 12/26/1978 |
| 4086122 | Hydroacoustic welder Apparatus is described for welding of thermoplastic parts and the like where the heat to melt the surface or surfaces to be joined is produced by friction during high frequency rubbing. The parts are adapted to be placed on a platen which enables the mati... | 04/25/1978 |
| 4077304 | Impact tools Impact tools are described which are capable of developing percussive forces for rock drilling, seismic exploration and other repetitive high force applications. Each of the tools contains a hammer and a valve which may be hydraulically actuated so as to ... | 03/07/1978 |
