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| Number | Title | Issue Date |
| 8109155 | Methods and apparatus to measure fluid flow rates Example methods and apparatus to measure fluid flow rates are disclosed. A disclosed example apparatus includes a circulator to selectively circulate a fluid in a flowline, a generator thermally coupled to the flowline at a first location and controllable to form a ... | 02/07/2012 |
| 7856892 | Flow-rate measuring method and flow-rate measuring device A measurable flow-rate range is increased to enhance usability. A flow-rate measuring method for measuring the flow rate of a fluid inside a tube is provided. This method uses a thermal-marker generator that heats the fluid flowing through the tube from the outside ... | 12/28/2010 |
| 7726204 | Heat signal writing device A heat signal writing device forming a clear writing pattern of a heat signal is provided. A heat signal writing device 10 for writing a heat signal in a medium traveling through a channel, which is secured to an appropriate position on the channel through wh... | 06/01/2010 |
| 7647844 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind A flow rate/liquid type detecting method for detecting the flow rate of a fluid and, at the same time, detecting any one of or both the type of the fluid and the concentration of the fluid, characterized in that, by using a flow rate/liquid type detecting apparatus ... | 01/19/2010 |
| 7409875 | System and method for determining velocity of electrically conductive fluid A flowing electrically-conductive fluid is controlled between an upstream and downstream location thereof to insure that a convection timescale of the flowing fluid is less than a thermal diffusion timescale of the flowing fluid. First and second nodes of a current-... | 08/12/2008 |
| 7377185 | Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind A flow rate/liquid type detecting method for detecting the flow rate of a fluid and, at the same time, detecting any one of or both the type of the fluid and the concentration of the fluid, characterized in that: by using a flow rate/liquid type detecting apparatus ... | 05/27/2008 |
| 7332087 | Flow sensing apparatus used to monitor/provide feedback to a split flow pumping system A method and apparatus for monitoring and controlling the nano-scale flow rate of fluid in the operating flow path of a HPLC system without relying on a nano-scale sensor in the operating flow path. A main flow sensor is disposed in the main flow path between the pu... | 02/19/2008 |
| 7293605 | Feed-back control system for heat exchanger with natural shedding frequency The invention relates with the feed-back control system of a heat exchanger by use of the flow resonance phenomenon which maximizes the heat transfer efficiency by generating the flow disturbances of a heat transfer medium. If a heat transfer medium is periodically ... | 11/13/2007 |
| 7281435 | Measurement of non-aqueous phase liquid flow in porous media by tracer dilution A method and apparatus for measuring in situ flow of non-aqueous phase liquids (NAPLs) through a porous medium is described. A tracer is introduced into a well or boring located in the medium and the tracer concentration in the well kept uniform by mixing. The rate ... | 10/16/2007 |
| 7270015 | Thermal pulsed ultrasonic flow sensor In thermal pulse flow measurements a relatively small bolus of flowing fluid is heated or cooled and the time required for the bolus to move downstream a known distance is measured. In many fluids, changing the temperature changes the acoustic transmission propertie... | 09/18/2007 |
| 7268859 | Liquid measuring system Systems and methods for measuring the flow of a liquid along a conduit are disclosed. A heat source applies thermal energy to a portion of a liquid flowing along a conduit thereby elevating its temperature. A light source generates a first beam that passes through t... | 09/11/2007 |
| 7265239 | Process for the conversion of furfuryl alcohol into levulinic acid or alkyl levulinate A process for the conversion of furfuryl alcohol into levulinic acid or alkyl levulinate comprising contacting furfuryl alcohol and water or an alkyl alcohol with a porous heterogeneous catalyst comprising strong acid ion-exchange resin, wherein the catalyst has por... | 09/04/2007 |
| 7261002 | Flow rate measurement for industrial sensing applications using unsteady pressures Flow rate measurement system includes two measurement regions 14,16 located an average axial distance ΔX apart along the pipe 12, the first measurement region 14 having two unsteady pressure sensors 18,20, located a distance X1 | 08/28/2007 |
| 7261004 | Flow transducer and method A transducer is disclosed for sensing flow of a fluid. The transducer includes means for applying a heat pulse to the fluid and at least one temperature sensor. The temperature sensor is adapted to detect a decaying response to the heat pulse to provide an indicatio... | 08/28/2007 |
| 7253742 | Method and apparatus for measuring parameters of a fluid flowing within a pipe using a configurable array of sensors An apparatus for measuring at least one parameter associated with a fluid flowing within a pipe includes a spatial array of pressure sensors disposed at different axial locations x1. . . xN along the pipe. Each of the pressure sensors provides ... | 08/07/2007 |
| 7204264 | High pressure capillary micro-fluidic valve device and a method of fabricating same A freeze-thaw valve and a method of micro-machining the freeze-thaw valve is provided and includes a valve housing, wherein the valve housing defines a housing cavity and includes a housing inlet, a housing vent, a capillary tubing inlet and a capillary tubing outle... | 04/17/2007 |
| 7201049 | Pulsed thermistor sensor A thermistor is pulsed with energy, and a time constant of decay of temperature is calculated based on measured resistance of the thermistor over a number of known intervals. The time constant is representative of the mass air flow. The ambient air temperature may b... | 04/10/2007 |
| 7188519 | Device and method for measuring the flow and at least one material parameter of a fluid For measuring the flow and the thermal conductivity of a fluid, a sensor is used, which has a first temperature detector for measuring a first temperature and a second temperature detector for measuring a second temperature. A heating is arranged between the tempera... | 03/13/2007 |
| 7186336 | Flow sensing apparatus A method and apparatus for monitoring and controlling the nano-scale flow rate of fluid in the operating flow path of a HPLC system. A first flow sensor is disposed in a first flow path between a first flow-divider and a fluidic tee. A second flow sensor is disposed... | 03/06/2007 |
| 7180581 | Lithography for optical patterning of fluids An illuminator (e.g., laser) produces a light beam that partially passes through, and is partially blocked by, a mask contrastingly patterned via non-transparent and transparent portions. The mask-conformed light passes through a lens so that the mask's pattern is p... | 02/20/2007 |
| 7128081 | Peltier based freeze-thaw valves and method of use A freeze-thaw valve is provided using a Peltier heat pump where the thermal short-circuit path between a cooled thermal mass and a heated thermal mass is reduced or absent and the valve state transition time is minimized. The freeze-thaw valve comprises a Peltier he... | 10/31/2006 |
| 7130060 | Refractive index determination by micro interferometric reflection detection A method and an apparatus for absolute refractive index measurements are disclosed, wherein a beam of spatially coherent laser light is directed perpendicularly on to a side of a capillary tube (12) and back reflected light is detected (16) over a rang... | 10/31/2006 |
| 7127954 | Method and device for measuring the flow rate of a fluid A method for measuring the flow rate of a fluid flowing in a conduit includes separating the fluid into two portions then flowing into two branches (20, 22). Both portions are then recombined in an outlet manifold (14). A difference is created between ... | 10/31/2006 |
| 7121150 | Method and apparatus to determine an initial flow rate in a conduit A method and apparatus for determining an initial flow rate in a conduit is disclosed. A known change is made to the flow to be measured, resulting changes (or values corresponding to these changes), or relative changes in the flow to be measured are monitored and t... | 10/17/2006 |
| 7117736 | Flow sensor A flow sensor (1) is constituted by a substrate (4) having a front surface (4a) side facing a channel (3) for a measurement target fluid (2), and a channel forming member (5) and a plate (6) disposed oppositely... | 10/10/2006 |
| 7107835 | Thermal mass flow sensor A thermal mass flow sensor is disclosed that includes a housing (16) having a first sensor region and a second sensor region, a first thin film temperature sensor (39) formed at the first sensor region and a second thin film temperature sensor (58 | 09/19/2006 |
| 7087444 | Method for integration of microelectronic components with microfluidic devices A method of forming an integrated microelectronic device and a micro channel is provided. The method offers an inexpensive way of integrating devices that are usually incompatible during fabrication, a microchannel and a microelectronic structure such as an electro-... | 08/08/2006 |
| 7066022 | Airspeed sensor and method for operating an airspeed sensor In an air-velocity sensor and a method for operating an air-velocity sensor, the air-velocity sensor includes a temperature sensor arranged in an air flow and sequential electronics. The sequential electronics are used to cyclically impinge upon the temperature sens... | 06/27/2006 |
| 7051599 | Thermal transient anemometer having sensing cell assembly A thermal transient anemometer provides mass flow rate or volume flow rate over smaller discrete regions of a larger flow field, i.e., the distribution of such rates over a predefined, larger area. The thermal transient anemometer comprises two components: a frame w... | 05/30/2006 |
| 7021135 | Thermal mass flow sensor A thermal mass flow sensor is disclosed that includes a housing (16) having a first sensor region and a second sensor region, a first thin film temperature sensor (39) formed at the first sensor region and a second thin film temperature sensor (58 | 04/04/2006 |
| 7020540 | Temperature control A method and apparatus are disclosed for controlling temperature of a plant comprising plural temperature control zones, wherein an effective control parameter for a first zone for which a signal representing measured temperature is available is produced according t... | 03/28/2006 |
| 6935192 | Microfluidic bulk flow determinations based on converting heat tracer measurements The fluid flow rate within a microfluidic passageway of a microfabricated device is determined by measuring the time-of-flight of a heat pulse coupled into the fluid. Since the propagation velocity of the heat trace is generally slower than the mean flow rate of the... | 08/30/2005 |
| 6932796 | Liquid metering system Systems and methods for measuring the flow of a liquid along a conduit are disclosed. A heat source applies thermal energy to a portion of a liquid flowing along a conduit thereby elevating its temperature. An optical sensing means comprising a light source illumina... | 08/23/2005 |
| 6911183 | Moving microdroplets The movement and mixing of microdroplets through microchannels is described employing microscale devices, comprising microdroplet transport channels, reaction regions, electrophoresis modules, and radiation detectors. The discrete droplets are differentially heated ... | 06/28/2005 |
| 6732581 | Low thermal capacity device for high precision pocket-size spirometry and other applications The spirometer has a low thermal capacity. A circuit supplies power to the spirometer in pulses to heat the spirometer to body temperature. The circuit senses the temperature of the spirometer between intervals. The circuit can also be used in a calorimeter to measu... | 05/11/2004 |
| 6672172 | Triggered flow measurement When a bolus dose of cold saline is injected into a catheter where a wire, carrying a sensor unit and electrical leads for signal transmission, is located, the lead resistance is affected by the cold saline thereby altering the resistivity. However, by co... | 01/06/2004 |
| 6668663 | Method and apparatus to determine flow rate with the introduction of ambient air A method of determining a rate of flow of a first gas in a pipe includes placing a flow-restricting device in the pipe such that the device and/or the pipe define a first channel section and a second channel section. The second channel section is disposed... | 12/30/2003 |
| 6530286 | Method and apparatus for measuring fluid flow The present invention relates to methods and apparatus useful for detecting and measuring flow of a fluid along a flow path. In a method according to the invention, the temperature of a flowing fluid is altered at a selected location for a selected durati... | 03/11/2003 |
| 6505520 | Method for preparing a thermal pulsed micro flow senor Disclosed is a method for preparing a thermal pulsed micro flow sensor comprising determining positions to allocate a plurality of thermal sensors along a microchannel, relatively to a heater positioned in said microchannel, and positioning said thermal s... | 01/14/2003 |
| 6386050 | Non-invasive fluid flow sensing based on injected heat tracers and indirect temperature monitoring A system and method for measuring flow rate within a fluid-bearing passageway include introducing heat fluctuations into the flow and then non-invasively monitoring the effects of the heat fluctuations propagating to or from one or more interrogation regi... | 05/14/2002 |
