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| Number | Title | Issue Date |
| 6003376 | Acoustic system for measuring the location and depth of underground pipe An acoustic method and apparatus for measuring the horizontal surface location and depth of any type of underground pipe or conduit, including nonmetallic or nonconductive pipe, such as sewer, gas, and water pipes, which cannot be detected with electromag... | 12/21/1999 |
| 5950487 | Gauge for measuring liquid levels An apparatus for measuring liquid level in a container, the apparatus having a flexible measurement scale attached at one end to a weight for retainment at the bottom of the container and at the opposite end to a receiver at the top of the container. A fl... | 09/14/1999 |
| 5948969 | Methods for measuring the flow rate due to a leak in a pressurized pipe system A method and improved apparatus for detecting leaks in pressurized pipeline systems, which compensate for the thermally induced volume changes of the liquid in the line during a test that are produced by both the nonlinear changes in the mean temperature ... | 09/07/1999 |
| 5415033 | Simplified apparatus for detection of leaks in pressurized pipelines An apparatus for detection of leaks in pressurized pipelines which utilizes a large pressure vessel and a small measurement vessel. The measurement vessel magnifies level changes during leak detection tests. The apparatus is connected to a pipeline throug... | 05/16/1995 |
| 5375455 | Methods for measuring flow rates to detect leaks A method for measuring thermally corrected leak rates in a pressurized pipeline system. The pipeline system is pressurized to at least two different pressures, and changes of volume of product required to maintain approximately constant pressure are measu... | 12/27/1994 |
| 5189904 | Temperature compensated methods for detection of leaks in pressurized pipeline systems using piston displacement apparatus The piston displacement apparatus and method for detection of leaks in pressurized pipelines disclosed herein measures volume changes at different pressures to determine thermally compensated leak rates. The apparatus uses a piston displacement apparatus ... | 03/02/1993 |
| 5170657 | Temperature compensated methods for detection of leaks in pressurized pipeline systems The apparatus and method for detection of leaks in pressurized pipelines disclosed herein measures thermally compensated leak rates. The apparatus uses an acoustic sensor and fiducial reference system to precisely determine leak rates.... | 12/15/1992 |
| 5163314 | Temperature compensated methods for detection of leaks in pressurized pipeline systems using gas controlled apparatus The gas pressure control apparatus and method for detection of leaks in pressurized pipelines disclosed herein measures thermally compensated leak rates. The apparatus uses a pressure vessel and gas pressure control system to precisely determine leak rate... | 11/17/1992 |
| 5146784 | Sensor for measuring liquid-level changes in storage tanks The improved device for measuring liquid-level changes in storage tanks uses a float to track vertical displacement of the surface of a liquid and a linear variable differential transducer (LVDT) sensor positioned below the surface of the liquid to measur... | 09/15/1992 |
| 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 |
| 5090234 | Positive displacement pump apparatus and methods for detection of leaks in pressurized pipeline systems The positive-displacement pump apparatus and method for detection of leaks in pressurized pipelines disclosed herein measures volume changes at different pressures to determine thermally compensated leak rates. The apparatus uses a positive-displacement p... | 02/25/1992 |
| 5078006 | Methods for detection of leaks in pressurized pipeline systems A method of determining the presence and temperature compensated volumetric flow rate of leaks in fluid pressurized pipelines. The pipeline is maintained at a first pressure and the fluid volume change per unit time is calculated. The pressure is then mai... | 01/07/1992 |
