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| Number | Title | Issue Date |
| 7319401 | Radar level gauge system with variable alarm limits A radar level gauge system for determining the filling level of a filling material in a tank is disclosed. The system comprises a transmitter for transmitting measuring signals towards the surface of the filling material; a receiver for receiving echo signals from t... | 01/15/2008 |
| 6907779 | Continuous flow measurement recorder and recording method A continuous flow measurement recorder is provided for making water flow measurements in an open channel. An ultrasonic sensor obtains pressure head measurements upstream from a flume or weir located in the open channel. A central processing unit receives the head m... | 06/21/2005 |
| 4420727 | Self oscillating acoustic displacement detector The present disclosure describes a system for detecting very small displacements of an object with respect to a self oscillating piezoelectric crystal by means of acoustic interference at the crystal. Acoustic energy transmitted by the oscillator is refle... | 12/13/1983 |
| 4323992 | Depth sounder repeater structure and method A depth sounder repeater providing a remote display of the depth of a body of water digitally or by meter movement, a depth alarm, a lost echo signal, and a meter scale expansion for shallow depth display in conjunction with a ship's sonar, display of "al... | 04/06/1982 |
| 4285053 | Acoustic method and apparatus for measuring micron and submicron distances A gauge for measuring variations in distance of a surface relative to a reference by means of phase shifts in a zone of high acoustic impedance. A gauge head is provided with a first orifice for emitting acoustic waves, driven by a reference signal, towar... | 08/18/1981 |
| 4221004 | Adjustable ultrasonic level measurement device An ulrasonic liquid level measurement device is used to measure the depth of a flowing liquid in a channel using an ultrasonic transducer that is positioned out of contact with the liquid and above and directed toward the channel. An ultrasonic burst is d... | 09/02/1980 |
| 4210970 | Echo sounders An echo sounder has a transducer for transmitting and receiving pulses of energy, a rotary arm display and a meter or digital display. The rotary arm is arranged to cause the transducer to transmit a pulse of energy on each occasion it passes a datum posi... | 07/01/1980 |
| 4175441 | Gauge for measuring distance to planar surfaces and thicknesses of planar members Apparatus for measuring distance between a gauge head orifice, and the front planar surface of an object by sensing acoustic pressure near the gauge head orifice. The acoustic pressure is initially generated by an audio oscillator activating a speaker whi... | 11/27/1979 |
| 4068207 | Acoustic log Apparatus for measuring a vessel's velocity relative to a reference location includes a transmitter on board the vessel for transmitting a coherent signal toward a reference location from where the coherent signal is reflected, and a receiver on board the... | 01/10/1978 |
| 3991398 | Acoustic log Apparatus for measuring a vessel's velocity relative to a reference location includes a transmitter on board the vessel for transmitting a coherent signal toward a reference location from where the coherent signal is reflected, and a receiver on board the... | 11/09/1976 |
| 3976969 | Underwater sound wave direction finding system In apparatus for determining the direction of impinging sound waves according to the sum/difference principle, by forming a sum signal and two difference signals in a gradient ranging system composed of four omnidirectional piezoelectric hydrophones arran... | 08/24/1976 |
| 3934219 | Acoustic method and apparatus for determining effectiveness of mine passage seal The effectivenss of a seal for extinguishing fires in an underground mine passage is determined by transmitting acoustic energy from a first site toward the seal. The acoustic energy is detected at a second site on the opposite side of the seal from the t... | 01/20/1976 |
