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| Number | Title | Issue Date |
| 5942698 | Detecting and measuring liquid flow in remote sewer structures In the particular embodiments described in the specification, a virtual sewer flow monitor detects flow rate and depth information periodically and supplies it to a scattergraph generator and a polynomial curve generator produces a polynomial curve corres... | 08/24/1999 |
| 5821427 | Liquid velocity measurement using curve fitting for peak velocity detection In the particular embodiments described in the specification, the velocity of a flowing liquid is measured by emitting acoustic signals from an acoustic signal unit into the flowing liquid and detecting signals reflected from solid particles moving with t... | 10/13/1998 |
| 5808195 | Arrangement for determining liquid velocity versus depth utilizing historical data In the embodiments described in the specification, an acoustic transducer unit emits acoustic signals into a moving liquid and receives reflected signals to produce Doppler frequency signals and a depth detector simultaneously detects the depth of the liq... | 09/15/1998 |
| 5333508 | Velocity measurement system A sonic-type fluid flow measuring system wherein reflections or echoes of an ultrasonic acoustic emitter (9) are sensed and typically comprise a number of frequencies representative of a number of discrete velocities of flow in a volume of fluid. As a sam... | 08/02/1994 |
| 5226328 | Velocity measurement system A sonic-type fluid flow measuring system wherein reflections or echoes of a burst 103 of ultrasonic energy from an ultrasonic acoustic emitter 9a are sensed and typically comprise a number of frequencies representative of a number of discrete velocities o... | 07/13/1993 |
| 5198989 | Sewer flow measurement control system A sewer flow monitoring system wherein the volume of flow is determined from the depth of fluid in a pipe together with the average velocity of flow through the pipe as determined by detecting the peak velocity from particles flowing in sewage at differen... | 03/30/1993 |
| 5020374 | Velocity measurement system A sonic-type fluid flow measuring system wherein reflections or echoes of an ultrasonic acoustic emitter are sensed and typically comprise a number of frequencies representative of a number of discrete velocities of flow in a volume of fluid. As a sample,... | 06/04/1991 |
