Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 7277790 | Combustion diagnostic for active engine feedback control This invention detects the crank angle location where combustion switches from premixed to diffusion, referred to as the transition index, and uses that location to define integration limits that measure the portions of heat released during the combustion process th... | 10/02/2007 |
| 7081745 | Paramagnetic oxygen sensing apparatus and method A paramagnetic oxygen sensor and method employs a pressure sensor having a membrane extending through an air gap for a magnetic field. A piezoelectric element is mounted on the membrane. Gas chambers are formed on either side of the membrane. The gas mixture, the pr... | 07/25/2006 |
| 7059173 | System for conducting the on-site measurement of the density or thermal resistance of a material A system suitable for conducting an on-site measurement of the density and/or R-value of a gas-permeable material, comprising: a device comprising: a chamber comprising a first port and a second port; a diffuser in fluid communication with the second port of the cha... | 06/13/2006 |
| 7055370 | Device for conducting the on-site measurement of the density or thermal resistance of a material A device suitable for conducting an on-site measurement of the density and/or R-value of a gas-permeable material is provided. The device comprises a chamber comprising a first port and a second port; a diffuser in fluid communication with the second port of the cha... | 06/06/2006 |
| 7055371 | On-site measurement of the density or thermal resistance of a material A device suitable for conducting an on-site measurement of the density and/or R-value of a gas-permeable material is provided, comprising: a chamber comprising a first port and a second port; a diffuser in fluid communication with the second port of the chamber, whe... | 06/06/2006 |
| 6367308 | Method of measuring the density of a dielectric gas in a buried metal-clad line A method of measuring the density of a dielectric gas under pressure in a buried metal-clad electricity line consists in measuring the pressure and the temperature of the dielectric gas by means of a sensor mounted on the case of the line, and in compensa... | 04/09/2002 |
| 6286361 | Method and apparatus for remotely detecting pressure, force, temperature, density, vibration, viscosity and speed of sound in a fluid An apparatus for detecting pressure in a hollow fan blade of a turbofan gas turbine engine comprises a magnetostriction transducer arranged in a sub chamber of the fan blade which is interconnected to a main chamber. A magnetic coil is arranged in the fan... | 09/11/2001 |
| 6286360 | Methods and apparatus for real time fluid analysis A gas analyzer (10) integrated into the main passageway (11) of a breathing circuit includes pressure-drop flow element (12) that measures a pressure drop across an orifice, an acoustic flowmeter (14) measures the speed of sound in the gas mixture, and a ... | 09/11/2001 |
| 6263914 | Gas density monitor assembly A density monitoring assembly for use in monitoring the gas density within a high voltage circuit breaker tank is disclosed. The density monitoring assembly is coupled directly to an exterior surface of said tank and provides electrical signals indicative... | 07/24/2001 |
| 6205846 | Method of determining with great accuracy the rate of leakage from the case of an electrical apparatus In the method, pairs of pressure and temperature values are recorded using a pressure sensor and a temperature sensor fixed to a case from the outside and communicating with a dielectric gas, thereby enabling a density value to be calculated for the diele... | 03/27/2001 |
| 6125692 | Density sensor for monitoring the rate of leakage from a switchgear case with improved reliability A density sensor for monitoring a rate of leakage from the case of electrical switchgear filled with dielectric gas under pressure, the sensor comprising a fixing support mounted from the outside in the thickness of the case and communicating with the die... | 10/03/2000 |
| 6065328 | Apparatus and method for determining thermophysical properties using an isobaric approach The instant invention relates to a method and apparatus to determine the thermodynamic properties of a gas medium without making a determination of gas composition. In the instant invention, the speed of sound of a gas medium in a vessel is determined at ... | 05/23/2000 |
| 6055846 | Method and apparatus for in situ calibration of gas flowmeters The focus of this paper is to introduce a novel method for calibrating natural gas flowmeters. This new method can accommodate very large flow rates and it avoids common problems associated with current techniques for meter proving. In this method, the am... | 05/02/2000 |
| 5902927 | Fluid metering apparatus and method A method and apparatus are described for controlling demand of a fluid. The method includes measuring a fluid supply pressure in a supply pipe, determining that the fluid supply pressure is lower than a predetermined threshold supply pressure, and directi... | 05/11/1999 |
| 5656784 | Fluid density variation compensation for fluid flow volume measurement A fluid density compensator for flow volume measurements utilizes a plurality of look-up calibration tables, each for a different density gas. The measurement device provides an output signal having a frequency corresponding to the flow rate therethrough.... | 08/12/1997 |
| 5551282 | Method and apparatus for measuring volume correction using molar quantities A method and apparatus for measuring volume correction in a gas pipeline using a variable volume chamber where the gas is sampled at the temperature and pressure of gas in the pipeline. A portion of a known volume of sample gas is released and a change of... | 09/03/1996 |
| 5509295 | Weather station device This invention describes a density altitude measuring device whereby the density altitude is calculated based on atmospheric inputs. The computer of the density altitude measuring device is connected to temperature, pressure and humidity sensors. The sens... | 04/23/1996 |
| 5501099 | Vapor density measurement system The relative amount of liquid and vapor flowing in a pipe is measured by mixing the vapor and liquid into a gaseous like single phase mixture and passing the mixture through a venturi constriction to accelerate it. The pressure drop across the venturi is ... | 03/26/1996 |
| 5502435 | Method and system for monitoring circuit breaker gas pressure A method and system are provided for monitoring the pressure of gas in a gas filled circuit breaker container based on a temperature compensated gas pressure signal which is compared with a signal representing a desired gas pressure in the container to pr... | 03/26/1996 |
| 5388451 | High voltage transmission switching apparatus with gas monitoring device A high voltage switching apparatus 10 is described containing an arc-quenching gas containing sulphurhexafluoride in a vessel 12 that is monitored by a gas monitoring device 20. A temperature transducer 34 is attached to the exterior of the vessel 12 to s... | 02/14/1995 |
| 5307668 | Gas density meter and method Disclosed is a method and apparatus for determining the ratio of the flowing condition density of a pipeline gas (i.e. the density at a flowing temperature and pressure) to the base condition density of the pipeline gas (i.e. the density at a base tempera... | 05/03/1994 |
| 5106294 | Method and arrangement for reducing the effect of disturbances on the combustion of a fan burner system A method for reducing the effect of disturbances, affecting the combustion of a fan burner system, including an arrangement for measuring the relative change of density of a gas as a function of its pressure and of its temperature and/or measuring a relat... | 04/21/1992 |
| 4677841 | Method and apparatus for measuring the relative density of gases Gas is vented through a very small orifice or pore with substantially stable pressures before and after the orifice. The orifice is designed so that the expansion through it is similar to a Joule-Thompson expansion of the gas. With ideal gas, this occurs ... | 07/07/1987 |
| 4065957 | Fluid speed indicating apparatus and densitometer Fluid density is measured in a fluid speed indicating apparatus by using a pair of rotor arms having a pair of asymetrically located venturis or equivalent venturis. A steady state pressure difference will be produced between the two pressure locations an... | 01/03/1978 |
