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| Number | Title | Issue Date |
| 4131431 | Blood shut-off valve Blood shut-off valve is positioned at the outlet of a blood oxygenator arterial reservoir so that the valve closes when the reservoir is emptied to prevent flow. Valve has a member which floats in the blood and an outlet valve seat against which the membe... | 12/26/1978 |
| 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 |
| 4114723 | Pneumatic seismic signal generator with independent firing control pressure An air actuated seismic signal generator, commonly termed an air gun includes a cylindrical casing that is divided into a control chamber and a firing chamber by a sliding valve. The end face of the sliding valve that is exposed to the control chamber has... | 09/19/1978 |
| 4108272 | Rapid fire air gun A rapid-fire air gun for generating acoustic pulses in a body of water includes a reservoir of high-pressure air, a shut-off valve, and a throttle valve for admitting air to an attached firing chamber. The firing chamber has an exhaust port that is sealed... | 08/22/1978 |
| 4108271 | Seismic land source A seismic land source for transmitting powerful seismic energy impulses into the earth comprising a dome-shaped bell within which is contained a substantially incompressible liquid and an air gun which can be fired for abruptly releasing pressurized gas i... | 08/22/1978 |
| 4106585 | Air gun firing control A method and apparatus for controlling the firing of a seismic source, wherein the firing circuit is coupled to the source by a two-conductor cable whose impedence is changed upon firing of the source. The change in cable impedence is detected and the tim... | 08/15/1978 |
| 4103281 | Measuring-while-drilling system having motor speed detection during encoding A measuring-while-drilling system includes motor speed detection during encoding for returning control to a phase locked loop circuit when the rate of an acoustic signal generator has precisely returned to a carrier frequency producing rate. The measuring... | 07/25/1978 |
| 4098369 | Underwater sound generator A monopropellant fluid is ignited in a combustion chamber to form a pressurized gas volume which may include the interior of a piston valve opening into the combustion chamber. A first gas path leading out of the combustion chamber conducts gas to surface... | 07/04/1978 |
| 4095667 | Portable underwater signalling transducer A portable underwater signalling apparatus for use by divers having self-contained underwater breathing apparatus (scuba) to signal to other divers as well as surface and underwater vessels. The apparatus utilizes compressed air from the diver's tanks to ... | 06/20/1978 |
| 4049078 | Marine acoustic pulse train signal generator An apparatus for generating a series of seismic acoustic pulses in a body of water. The series is characterized by having continuously-variable, non-repetitive time intervals between successive pulses during a continuous seismic recording. The preferred g... | 09/20/1977 |
| 4047592 | Self-driven underwater noisemaking device An underwater noisemaking device that is self-driven for use in towed undater acoustic minesweeping or as a decoy countermeasure device. It comprises a cambered and slotted disc mounted in a frame so as to be free to rotate about a horizontal, transverse... | 09/13/1977 |
| 4034827 | Air gun utilizing magnetized shuttle Disclosed is an improved air gun construction which lends itself to use with a plurality or array of similarly improved air guns which enables easy synchronization and timing of such array of air guns relative to one another. In the preferred embodiment, ... | 07/12/1977 |
| 4033429 | Downhole seismic source Disclosed is a seismic source forming part of a drill string which allows geological prospecting while drilling a borehole. The source includes a section of drill pipe having a spiral cam machined into its outer surface and a port for allowing mud to flow... | 07/05/1977 |
| 4016951 | Air transportable seismic exploration system for use on ice-covered waters A seismic exploration system for use on ice-covered waters is disclosed. The system comprises a housing which contains equipment such as an engine, a compressor, means for boring holes in the ice, and acoustic signal generating means that can be lowered i... | 04/12/1977 |
| 4015684 | Snow field sound imploder A sound imploder having as its exclusive function the creation of sonic phenomena when embedded in snow or ice fields. Special components are provided for production of steam as the source of the sound and heat for causing the device to immerse itself due... | 04/05/1977 |
| 4007805 | Cavity producing underwater sound source 1. An acoustical source for minesweeping operations comprising a stator ing outer and inner surfaces which are surfaces of revolution and an open port connecting said outer and inner surfaces, an external rotor adapted to be rotated around said outer sur... | 02/15/1977 |
| 4006794 | Seismic pneumatic energy source with flap valves for attenuation of bubble pulse amplitude and reduction of period of bubble oscillation A method for decreasing the amplitude and period of bubble pulses following a primary seismic energy pulse comprises generating an expanding air bubble around a body and preventing the air bubble from contracting into the body for attenuating the sudden c... | 02/08/1977 |
| 3997022 | Device for generating acoustic waves by implosion Device for generating acoustic waves in a fluid medium by implosion, comprising a main cylinder, a main piston slidably mounted thereinto, said piston having a hollow cylindrical portion housing another cylinder solid with the main one and, through the bo... | 12/14/1976 |
| 3993974 | Seismic method for determining the position of the bit on a drill stem in a deep borehole A method for determining the precise position of the drill bit on the bottom of a long drill string in a deep borehole in the earth during a drilling operation, with a minimum of effort and interruption of the drilling process. It provides placing a plura... | 11/23/1976 |
| 3979724 | Seismic method for determining the position of the bottom of a long pipe in a deep borehole A method and apparatus for determining the position of the bottom end of a long pipe in a deep water-filled borehole, comprising generating a shock wave in the water at the surface end of the pipe, timing the travel of the shock wave down the pipe to the ... | 09/07/1976 |
| 3979140 | Seismic method for logging position of a deep borehole in the earth Method and apparatus for logging the position of a deep borehole filled with liquid in the earth, comprising a long, continuous small diameter pipe adapted to be reeled up on a drum mounted on a vehicle, and means to insert the end of the pipe into the mo... | 09/07/1976 |
| 3978940 | Acoustic source A broadband low frequency source suitable for deep sea applications without pressure compensation is disclosed. The source utilizes hydraulically powered flexural disc radiators which are sized to small fractions of the generated wavelength. Inertance is ... | 09/07/1976 |
| 3953826 | Super long seismic source An elongated seismic source for use in marine seismic explorations consisting of individual seismic sources with one or more sources being grouped in an array. A number of arrays are used with each array being individually supported in the water and coupl... | 04/27/1976 |
| 3952833 | Method and apparatus for generating pressure waves in water by implosion A gas exploder consisting of a rigid cylindrical lower member and a rigid upper member telescoping therein to form a chamber in which a gas explosion can take place is supported beneath the surface of the water from a float by means of low resilience rope... | 04/27/1976 |
| 3951231 | Seismic exploration A marine acoustic seismic generator carried on the deck of a boat is coupled to a body of water in which the boat floats by a column of water in a pipe extending between the generator and the body of water. Post explosion oscillations are damped or termin... | 04/20/1976 |
| 3949831 | Device for generating acoustic waves in a liquid medium A device for generating acoustic waves in a liquid, comprising two hollow enclosures communicating through a narrow passageway, a valve interposed in said passage way for controlling said communication, means for feeding a first one of said enclosures, in... | 04/13/1976 |
| 3946831 | Acoustic transmitter A transmitter of acoustic energy which propagates that energy in a directional manner is described. An acoustic signal generator is connected at one end of an acoustic transmission line which exhibits a certain characteristic impedance. The line has a num... | 03/30/1976 |
| 3944019 | Deep water sound imploder An underwater sound imploder adapted for use in the exploration of minerals existing under the sea bed. The imploder consists of three main units, a boiler, a heat shield therefor and a bell shaped sonic device to which the boiler has delivered superheate... | 03/16/1976 |
