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| Number | Title | Issue Date |
| 7441628 | Wellbore signal generator Methods and apparatus for generating a signal with a signal generator comprising a tool body disposed in a tubular member. A first and second electromagnets are disposed within the tool body such that the second electromagnet is opposite the first electromagnet. A p... | 10/28/2008 |
| 7268703 | Methods, systems, and devices for cartographic alerts Systems, devices, and methods are provided for marine navigation and course calculation for avoiding preselected conditions. An electronic marine navigation device with marine course calculation capabilities includes a processor connected to a memory that includes c... | 09/11/2007 |
| 7213456 | Device for measuring the level of a fluid in a fuel tank of a motor vehicle A device for measuring the level of a fluid in a container by means of a sound guide tube and an ultrasonic transducer disposed inside the container mounted in a fluid feeding device within the container. ... | 05/08/2007 |
| 6982929 | Height measurement method and apparatus The present invention provides for a system and method for measuring the height of a guest at a theme park, including employing an ultrasonic emitter and sensor to determine height. The park may have a plurality of different predetermined minimum height ranges or ca... | 01/03/2006 |
| 6968738 | Acoustic fluid-gauging system An aircraft ultrasonic fuel-gauging system has a processing unit that energizes probes and receives signals from transducers arising from energy reflected back from the fuel surface. In addition to determining the time between transmission of a signal from the trans... | 11/29/2005 |
| 6934657 | Method, system, and device for graphically presenting water temperature data Systems, devices and methods are provided for monitoring water temperature. One method includes receiving water temperature data and graphically presenting the data. The data is presented having the water temperature data graphically differentiated to indicate when ... | 08/23/2005 |
| 6595315 | Underwater detecting apparatus, depth measuring apparatus and display apparatus A screen on which water depth information obtained from an echo signal is historically displayed and a screen on which fish school detection information obtained from an echo signal is displayed, are displayed side by side on a display screen of a display... | 07/22/2003 |
| 6588269 | Piezoelectric device for measuring liquid level The invention concerns a device for measuring liquid level, comprising a detection set (Si) including two piezoelectric cells (10, 12) associated with control means for transmitting ultrasonic waves respectively opposite a reference reflector (16), locate... | 07/08/2003 |
| 6505509 | Apparatus and method for measuring the level of a fluid An apparatus for detecting a fluid level is disclosed, which includes a coaxial sensor having a pair of conducting tubes positioned with respect to each other in spaced coaxial arrangement, a coaxial transmission line connected to the sensor, a means for ... | 01/14/2003 |
| 6427532 | Device for measuring a fill level of a liquid in a container A device for measuring a fill level of a liquid includes an ultrasonic sensor with two sensor elements. One of the sensor elements determines the echo time of an ultrasonic wave to a float which follows the liquid level. The other of the sensor elements d... | 08/06/2002 |
| 6360599 | Device for measuring liquid level preferably measuring tide level in sea A device and process for measuring tide levels comprising a guide tube having its lower open end immersed below the lowest tide level, a transducer positioned substantially at the upper end of the guide tube for generation and reception of electrical and ... | 03/26/2002 |
| 6345683 | System and method for an improved device for measuring water levels A method and apparatus for determining the surface level of a given body using acoustic ranging that incorporates processes natural to human beings to improve identification of the echo from the water surface when spurious echoes might otherwise overshado... | 02/12/2002 |
| 5778726 | Device for monitoring a predetermined level of a liquid in a container For monitoring a predetermined level of a liquid in a container an ultrasonic sensor is fitted on the outer surface of the container wall at a measurement point situated at the height of the level to be monitored, said sensor containing an ultrasonic tran... | 07/14/1998 |
| 5507178 | Liquid presence and identification sensor A sensor for determining both the presence of a liquid in a container or conduit, and identifying its type has a sensor housing body containing both a pair of piezoelectric elements used as the transmitter and receiver of ultrasonic waves directed across ... | 04/16/1996 |
| 5363341 | Level measuring device which can be assembled from components The invention discloses a level measuring device which can be made up from components. It comprises a sonic or ultrasonic transducer which is arranged in a first housing and forms a self-contained functional unit; the electrical circuit arranged in a furt... | 11/08/1994 |
| 5357801 | Liquid-level gauging An ultrasonic liquid level gauging sensor has a transducer at the lower end of a tube that is filled with liquid to the same height as liquid outside the tube. The sensor has an axial rod extending along the tube and supporting several calibration reflect... | 10/25/1994 |
| 5319974 | Ultrasonic level measuring system To determine the depth of a body of water, ultrasonic pulses are transmitted from a point above the water at a known distance. Reflections from the water are received and the time of each of the leading edge of the reflections and the trailing edge are re... | 06/14/1994 |
| 5319973 | Ultrasonic fuel level sensing device In one aspect of the present invention, an apparatus for measuring the height of liquid contained in a storage tank is disclosed. A tube is disposed inside the tank. A float is disposed inside the tube and is buoyed on the surface of the liquid. An ultras... | 06/14/1994 |
| 5309763 | Liquid-level gauging An ultrasonic liquid-level sensing system has a sensor with a number of reflectors mounted one above the other along the length of a tube that extends upwardly from a transducer and is filled with liquid to the same height as outside the tube. Liquid heig... | 05/10/1994 |
| 5263371 | Methods for temperature-compensated liquid height and leak detection measurements using quasi-static reference subsystem A method for measuring the temperature-compensated change in the height of a surface of a liquid. The method positions an acoustic signal transducer for emitting and receiving acoustic signals below the surface of the liquid, positions a quasi-static refe... | 11/23/1993 |
| 5226320 | Measuring device and process for determining the fill level in fluid containers, preferably for tank installations, with a sound waveguide In a level measuring device for containers filled with fluid, preferably tanks in tank installations, the fill level height h is determined from the transit time of ultrasound pulses which are emitted by first sound pulse transmitters along a main measuri... | 07/13/1993 |
| 5131271 | Ultrasonic level detector An ultrasonic level detector includes a transducer for generating and receiving bursts of sonic energy at a surface to locate the position of the surface. In response to receiving a burst of energy reflected from the surface, the transducer generates an e... | 07/21/1992 |
| 5127266 | Methods for liquid measurement using quasi-static reference subsystem Methods for measuring liquid levels and leak rates in a storage tank, using an acoustic transducer and a quasi-static reference device that positions an acoustic target within a predetermined distance range below the surface of the liquid. A method for me... | 07/07/1992 |
| 5119676 | Ultrasonic method and apparatus for determining water level in a closed vessel An ultrasonic method and apparatus for measuring liquid level in a vessel employing an acoustic waveguide (16) connected to an ultrasonic transducer (14) and the vessel (18). Guiding means (24) situated inside a vessel (18) directs the acoustic energy pul... | 06/09/1992 |
| 5121340 | Multi-level probe and system for measurement of physical conditions in liquid-containing tanks A multi-level probe for sonic range measurements utilizes a plurality of parallel reflectors that each include an opening arranged coaxially about a beam of ultrasonic energy transmitted along a reference axis from an associated transducer. The opening in... | 06/09/1992 |
| 5088068 | Hand-held underwater distance measurement device A hand-held underwater distance measurement device has a first end having a waterproof housing which houses a digital display and a suitable electronics package, a second end housing a transceiver, a middle section having a pair of rectangular telescoping... | 02/11/1992 |
| 5076101 | Liquid level measurement system for tanks A system for sensing the level of contents in a container is disclosed. A tubular member is vertically disposed in the container and sealed from the contents of the container. A marker located in the tubular member and generating a peripheral polarized ma... | 12/31/1991 |
| 5036703 | Method and apparatus for testing liquid fillings in tanks The invention relates to a method and an apparatus for investigating a filling of liquid in a container, e.g. a fuel tank in respect of actual volume, density, temperature, opacity or other condition. From an emitter (19) at the bottom of the container th... | 08/06/1991 |
| 5033031 | Underground ultrasonic tillage depth sensor A device for determining the depth below the ground surface of a working member of an earth moving equipment, comprises a sensor for transmitting ultrasonic signal from underneath and toward the ground surface and for receiving a portion of the signal ref... | 07/16/1991 |
| 4918671 | Depth sounder operation for hostile environments A system is provided for the detection of an unsuitable water condition in which either large globules of solid material or bait fish suspended in the water beneath a vessel adjacent the hull of the vessel are detected and the associated depth sounding de... | 04/17/1990 |
| 4916674 | Method and apparatus for improving the shallow water performance of a depth sounder Acoustic delay means are interposed between the face of a transducer and the bottom of a vessel, with the delay being equal to or greater than the shallowest depth the associated depth sounder capable of, whereby subtracting out the depth associated with ... | 04/10/1990 |
| 4873676 | Sonar depth sounder apparatus An improved microprocessor-controlled sonar depth sounder, which is automatically operative to detect and lock to the bottom of a body of water, fill in the display below the detected bottom, change display scales in response to the detected bottom going ... | 10/10/1989 |
| 4837750 | Apparatus for displaying depth sounding data with nautical range Apparatus and a method for displaying depth sounding data with nautical range are disclosed for use on vessels or the like, the device including a transceiver for transmitting an acoustic signal downwardly through surrounding water and for receiving echo ... | 06/06/1989 |
| 4829493 | Sonar fish and bottom finder and display An improved microprocessor-controlled sonar depth sounder, which is automatically operative to detect and lock to the bottom of a body of water, fill in the display below the detected bottom, change display scales in response to the detected bottom going ... | 05/09/1989 |
| 4829492 | Depthfinder with color LCD display A depthfinder has a color LCD display without a polarizer. This permits viewing of the display in bright sunlight, such as would be ordinarily used for fishing, without washing out of the display. Additionally, the provision of a LCD display without a pol... | 05/09/1989 |
| 4780861 | Automatic control system for filling beverage containers An automatic, ultrasonic system for controlling the filling of different sizes of beverage containers which may or may not contain various quantities of ice. The system includes a transducer assembly and a control module, both preferably connected to a be... | 10/25/1988 |
| 4775028 | Method and system for depth sounding A method and apparatus for the sounding of waters, particularly suitable for depth (and the like) sounding of Arctic waters, comprises shooting an energetic projectile at the water or ice surface from, say, a helicopter which has suspended close to the wa... | 10/04/1988 |
| 4765186 | Liquid level detector by guided elastic waves The liquid level detector using guided waves, comprises a first transducer situated out of the liquid for sending an incident elastic pulse which propagates in an elongated guide of which the lower part is immersed in the liquid, a second transducer situa... | 08/23/1988 |
| 4637463 | Echo ranging gun An echo ranging gun (10) is disclosed which is useable with high pressure gas wells having gas pressure exceeding 15,000 psi. The gun (10) is connected to the needle valve (30) typically encountered on a well having high pressure. The needle valve can hav... | 01/20/1987 |
| 4408676 | Gas gun assembly A gas gun assembly for measuring depths of reflectors in a well bore includes a housing having a central chamber and bottom bulkhead through which a first valve bore extends. Coupling structure is provided to connect the housing to the well. A cap closure... | 10/11/1983 |