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| Number | Title | Issue Date |
| 8171800 | Differential pressure sensor using dual backside absolute pressure sensing A MEMS differential pressure sensing element is provided by two separate silicon dies attached to opposite sides of a silicon or glass spacer, the sides of which are recessed and the recesses formed therein at least partially evacuated. The dies are attached to the ... | 05/08/2012 |
| 7963170 | Pressure sensor A pressure sensor is disclosed wherein pressure induced changes in birefringent properties of an optical sensing element are read out by transmission of at least one light beam. The pressure sensor can include at least one single-material transparent body which is s... | 06/21/2011 |
| 7886610 | Differential pressure gauge for filter An apparatus for measuring the differential pressure of fluid in filter. The apparatus comprises a housing defining a pressure chamber. A differential pressure gauge divides the pressure chamber into first and second fluid chambers. The differential pressure gauge i... | 02/15/2011 |
| 7467555 | Pressure transmitter with multiple reference pressure sensors Reliability and accuracy in a pressure measurement transmitter are provided by employing a plurality of absolute or gauge pressure sensors operating in conjunction with a differential pressure sensor. A method is also provided to perform diagnostics based upon the r... | 12/23/2008 |
| 7458273 | Fiber optic differential pressure sensor A fiber optic differential pressure sensor. In a described embodiment, a differential pressure sensor system for use in a subterranean well includes a fluid property sensing housing having a flow passage formed therethrough. A differential pressure sensor has an opt... | 12/02/2008 |
| 7437940 | Apparatus for measuring differential pressure An apparatus for measuring differential pressure includes first and second sensor units. The first sensor unit detects directly a first pressure of a substance at a first position and acquires a first detection result that indicates the first pressure. The second se... | 10/21/2008 |
| 7389696 | Measuring device with a microsensor and method for producing the same A measuring apparatus includes at least one microsensor having at least two chambers filled with a gas. The chambers are connected to one another by at least one channel. Moreover, the chambers are sealed off to the outside in a gastight manner. Also provided is a d... | 06/24/2008 |
| 7366648 | Electronic circuit analyzing apparatus, electronic circuit analyzing method, and electronic circuit analyzing program The present invention provides an electronic circuit analyzing apparatus for evaluating the reliability value of an analysis result, an electronic circuit analyzing method, and an electronic circuit analyzing program. The electronic circuit analyzing apparatus compr... | 04/29/2008 |
| 7357033 | Manual resuscitators with integral manometer A manometer integrated into a manual resuscitator includes a housing with a communication path, and a pressure gauge integrally forming part of the housing. A sensing chamber and an atmospheric chamber are separated by a diaphragm subject to distortion by differenti... | 04/15/2008 |
| 7337675 | Method for measuring average velocity pressure and system thereof A method for measuring average velocity pressure of a stack comprises the following steps. First, a total pressure measuring device is provided. The total pressure measuring device then measures the total pressure at a first location in the stack. Next, physical par... | 03/04/2008 |
| 7328624 | Probe for measuring parameters of a flowing fluid and/or multiphase mixture A probe 10,170 is provided that measures the speed of sound and/or vortical disturbances propagating in a single phase fluid flow and/or multiphase mixture to determine parameters, such as mixture quality, particle size, vapor/mass ratio, liquid/vapor ratio, ... | 02/12/2008 |
| 7322744 | Temperature measurement device A temperature measuring device includes a temperature-responsive element that mechanically moves a first inductive assembly component relative to a second inductive assembly component in response to temperature changes. The movement of the first inductive assembly c... | 01/29/2008 |
| 7311006 | Pressure sensor A pressure sensor has a case having a first side and a second side, and a sensing portion mounted to the case. A first diaphragm is disposed on the first side of the case such that a first chamber is defined. A second diaphragm is disposed on the second side of the ... | 12/25/2007 |
| 7308829 | Differential pressure indicator and method of manufacture A differential pressure indicator and method of configuring a differential pressure indicator is provided. The differential pressure indicator is configurable to provide open circuit or closed circuit logic and includes a housing, a pressure responsive element, a po... | 12/18/2007 |
| 7308820 | Piezocable based sensor for measuring unsteady pressures inside a pipe A piezocable based sensor for measuring unsteady pressures inside a pipe comprises a cable wrapped around the pipe and an outer band compressing the cable towards the pipe. The cable provides a signal indicative of unsteady pressure within the pipe in response to ex... | 12/18/2007 |
| 7284437 | Device and method for the status monitoring of a pressure measuring unit The invention relates to a device and a method for the status monitoring of a pressure measuring unit in an absolute or differential or relative pressure transducer, a pressure-sensitive element installed in the pressure measuring unit being impinged with at least o... | 10/23/2007 |
| 7281430 | Inflatable manometers An inflatable air cell pressure transducer. The air cell has a concavity formed therein. The concavity has two edges, wherein increased pressure within the air cell causes contraction of the concavity moving the two edges closer. ... | 10/16/2007 |
| 7278320 | Omni-directional pressure pickup probe A pressure pickup probe assembly includes a probe housing, a plurality of openings, and a pickup probe. The probe housing is configured to be mounted within, and extend at least substantially across, a flow passage. The probe housing further includes at least an inn... | 10/09/2007 |
| 7275443 | Pressure and differential pressure gauge with overload protection A pressure pickup, having a pressure chamber, which is located between a separating membrane and a platform. A pressure canal for hydraulic transmission of pressure to a measuring cell, includes, for dynamic overload protection, a Venturi throttle implemented by pro... | 10/02/2007 |
| 7272977 | Dual gauge A dual gauge assembly. In an exemplary embodiment, the dual gauge assembly includes a housing. Further, a display face is disposed within the housing for displaying a pressure range. In addition, an indicating device is disposed within the housing for indicating pre... | 09/25/2007 |
| 7219551 | Differential pressure sensor According to the present invention, there is provided a high-precision differential pressure sensor which is not affected by a considerable change in baseline pressure. A differential pressure sensor of the present invention includes: a pair of diaphragms, each incl... | 05/22/2007 |
| 7185543 | Ultra-precision micro-differential pressure measuring device and ultra-precision differential pressure measuring device The ultra-precision micro-differential pressure measuring device comprises a device body 1 having an inner space part therein, a pressure receiving plate 3 which is installed inside the inner space of the device body 1 and divides the said inner... | 03/06/2007 |
| 7159468 | Fiber optic differential pressure sensor A fiber optic differential pressure sensor. In a described embodiment, a differential pressure sensor system for use in a subterranean well includes a fluid property sensing housing having a flow passage formed therethrough. A differential pressure sensor has an opt... | 01/09/2007 |
| 7152480 | Differential pressure detection type pressure sensor and method for manufacturing the same A differential pressure detection type pressure sensor includes: a casing having a concavity; a pressure detection element disposed on a bottom of the concavity; a through hole; a first protection member in the concavity; and a second protection member in the throug... | 12/26/2006 |
| 7139667 | Method for calibrating a volumetric flow meter having an array of sensors A method and apparatus are provided for calibrating a flow meter having an array of sensors arranged in relation to a pipe that measures a flow rate of a fluid flowing in the pipe. The method features the step of calibrating the flow rate using a calibration correct... | 11/21/2006 |
| 7137297 | System and method for non-contact forming of parts to a fluid sensor assembly A method for coupling components of a fluid sensor assembly for a vehicle, the method comprising the steps of providing a body portion of a fluid sensor assembly with a joining section that has a mating surface, providing a head portion of a fluid sensor assembly wi... | 11/21/2006 |
| 7134346 | Differential pressure transducer with Fabry-Perot fiber optic displacement sensor A differential pressure transducer which incorporates a Fabry-Perot sensor for direct quantitative measurements of the distance displaced by a piston abutting two pressure boundaries is described. The apparatus includes a piston with an annular protrusion which is f... | 11/14/2006 |
| 7124642 | Dual gauge with dual calibration system and method A dual gauge system determines pressures of two separately contained gases by use of two separate pointer—Bourdon tube sections within the dual gauge. The Bourdon tube of a first one of the sections is gaseously coupled to a first one of the contained gases to det... | 10/24/2006 |
| 7089790 | Pressure sensor with laminated membrane A pressure sensor (30) for sensing a fluid pressure in harsh environments such as the air pressure in a tire, by using a chamber (58) partially defined by a flexible membrane (50), the flexible membrane (50) is a laminate having at least ... | 08/15/2006 |
| 7021149 | Differential pressure sensor with overload damping A differential pressure sensor includes a measuring mechanism having a chamber on the high-pressure side that is sealed by a first dividing membrane, and a chamber 6 on the low-pressure side that is sealed by a second dividing membrane. The first dividing mem... | 04/04/2006 |
| 6901805 | Device for measuring the pressure of a fluid A pressure sensing device for measuring the pressure of a fluid, comprising: a measurement diaphragm which is at least partially made of semiconductor material, is provided with a first surface and a second surface which are exposed respectively to a first pressure ... | 06/07/2005 |
| 6892584 | Fabricated pitot probe assembly A pitot pressure sensing probe assembly is made up of individual components comprising a barrel formed with a longitudinal interior passageway and a conical end cap at its leading end. A strut that has stamped or formed sections secured together to form the strut wi... | 05/17/2005 |
| 6662818 | Programmable tracking pressure regulator for control of higher pressures in microfluidic circuits Regulator for precision control of pressure based on a means of measuring pressure differentials. More specifically, the present invention provides a pressure control that tracks a relatively high background pressure, and applies a positive or negative of... | 12/16/2003 |
| 6578425 | Apparatus and method for verifying the dynamic stiffness capability of hydraulic servo actuators The dynamic stiffness of a flight control actuator is assessed by providing an actuator control system that includes an actuator and a portion of the actuator is coupled to an aircraft control surface. A command signal is applied to the actuator control s... | 06/17/2003 |
| 6564642 | Stable differential pressure measuring system The present invention provides a stable differential pressure measurement system. Two micro-machined semiconductive capacitive sensors each has a diaphragm exposed on one side and having a sealed partially evacuated chamber within the sensor on the other ... | 05/20/2003 |
| 6557417 | Method and device for void fraction measurement and adverse output signal mitigation on pressure-base instruments A method and device for void fraction measurement in a gas/liquid two-phase stratified flow system in disclosed. A couple of pressure-signal tubes are mounted to the through into the top and bottom walls of the horizontal pipeline portion of the flow syst... | 05/06/2003 |
| 6116093 | Differential pressure gauge assembly A differential fluid pressure assembly (10) has an inner differential fluid pressure gauge (14) enclosed by an outer fluid-tight housing (12). A low pressure fluid inlet (34) is in fluid communication with the space (32) defined by the outer housing (12).... | 09/12/2000 |
| 5070736 | Differential pressure sensor with read-out device A differential pressure sensor comprises a pair of bourdon tubes disposed in an arrangement wherein deflections of the two bourdon tubes resulting from fluid pressures connected thereto take place in two opposite directions and the deflective extremities ... | 12/10/1991 |
| 5022269 | Resonance frequency position sensor A position sensor includes a vibrating elongated member with a marker retained thereto in a sliding relationship thereon, wherein the marker coupled to a displacement of a target corresponding to a change of a physical quantity alters the natural frequenc... | 06/11/1991 |
| 4718279 | Dual bourdon tube type sensing pressure transducer A pressure transducer in the nature of a differential pressure transmitter including an instrument housing defining a chamber in which is mounted a sensing transducer one of several known types powered to provide a gauge signal that is to be supplied to i... | 01/12/1988 |
