Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8051708 | Temperature measuring circuit in a flowmeter A value of a line-to-line resistor (24) is determined by subtracting a resistance value determined as a product of a voltage ratio based on divided voltages and a value of a reference resistor in a non-conductive state between a second electric wire (26 | 11/08/2011 |
| 8037751 | Flow rate measuring apparatus The flow rate measuring apparatus includes a connector portion, a main body portion, a bypass passage, a flow rate sensing element having a flow rate detection portion, a control circuit, a pair of metal terminals having end portions connected to a connector, embedd... | 10/18/2011 |
| 7954373 | Thermal type flow meter There is provided a thermal type flow meter capable of accurately detecting a flow rate even when a fluid temperature varies rapidly or when the fluid temperature is high. A probe includes: a first main heating resistor; a second main heating resistor set at a tempe... | 06/07/2011 |
| 7895888 | Thermal mass flow meter including heating element and temperature sensors formed on separate chips and secured to the outer periphery of the pipe A heater chip (4) as a heat generation element is secured to the surface on the periphery of piping (2). Further, a temperature sensor chip couple (6) is placed on the surface on the periphery of the piping (2), along the direction of flo... | 03/01/2011 |
| 7814785 | Thermal flow meter, thermal flow meter control method, and sensor element of thermal flow meter A thermal flow meter corrects flow rate detection errors produced by vaporization of liquid phase components included in a gas to be measured. The thermal flow meter includes a correction circuit 500 that applies respectively different predetermined voltages ... | 10/19/2010 |
| 7726187 | Thermal type flow meter and engine control system using the same A thermal type flow meter has a first heating resistor, a second heating resistor for blocking heat transfer from the first heating resistor to a console, a temperature measuring resistor interposed between the two heating resistors, and a controller for calculating... | 06/01/2010 |
| 7617724 | Thermal mass flow meter having a heater and paired temperature sensor chips separately formed and mounted on the flow pipe A piping is anchored onto the lower faces of a heater chip and temperature sensor chips by using a thermal conductive adhesive. The heater chip and the temperature sensor chips are coated with a molding resin, and thermal resistance up to an element formed inside th... | 11/17/2009 |
| 7591177 | Flow sensor and mass flow controller using the same A low cost, compact, high performance flow sensor that can be made small in size even for use in a large flow rate and a mass flow controller using the same are provided. The flow sensor includes a bypass passage, a sensor passage, and a bridge circuit including hea... | 09/22/2009 |
| 7587938 | Thermal type flow meter including a secondary heating device to suppress heat transfer A thermal gas-flow measuring instrument has a first heating resistor placed in the gas to be measured. A temperature sensing resistor is positioned upstream or downstream of the first heating resistor and generates signals relating to the flow rate. Between the firs... | 09/15/2009 |
| 7565836 | Thermal type flow sensor having a second control circuit to control a second heating resistor above the first heating temperature A flow rate measuring element of a thermal type flow sensor is placed in the fluid to be measured. The element includes: a first heating resistor for measuring a flow rate; a second heating resistor for heating a support for the first heating resistor; and current c... | 07/28/2009 |
| 7555945 | Mass air flow sensor having off axis converging and diverging nozzles A mass air flow sensor for an internal combustion engine is provided. The sensor has a pair of opposed nozzles. A converging nozzle has a first conical throughbore having a first throughbore axis, the first throughbore has first and second apertures, the first apert... | 07/07/2009 |
| 7444863 | Thermal mass flowmeter Disclosed is a thermal mass flowmeter, which comprises a heating unit disposed on an outer peripheral surface of a capillary tube, and a pair of temperature-sensing units each provided as a separate component from said heating unit. The temperature-sensing units are... | 11/04/2008 |
| 7418859 | Device for measuring a volume flow with inductive coupling A device for measuring a volume flow, especially a tidal volume flow sensor, with a flow channel (1) and with a sensor element (6) arranged within the flow channel (1), is shown and described. The task of providing such a device, in which the se... | 09/02/2008 |
| 7415935 | System for determining the air flow conditions around one or more sails The invention relates to a system adapted for sailors in order to determine the air flow conditions around one or more sails, in conjunction with which both sides of the sails are equipped with a number of ultrasonic sensors that are distributed over the surface and... | 08/26/2008 |
| 7363810 | Corrosion resistant metal made thermal type mass flow rate sensor and a fluid supply device using the same A corrosion resistant thermal type mass flow rate sensor, and a fluid supply device employing the sensor are provided thus allowing enhanced corrosion resistance of the thermal type mass flow rate sensor, improve responsiveness, to be achieved particle-free, and to ... | 04/29/2008 |
| 7333899 | Fluid flow rate sensor and method of operation A thermo-anemometer-type fluid flow rate sensor design and a method for its operation that overcome the response time limitations of prior known fluid flow rate sensors is disclosed. The fluid flow rate sensor includes a probe having a detection module adapted to ch... | 02/19/2008 |
| 7321833 | Fluid flow rate sensor A valve body defines an inlet, an outlet, a valving cavity disposed between the inlet and outlet and a valving surface between the inlet and the outlet. A valve is moveable to a position away from the valving surface for permitting flow from the inlet through the va... | 01/22/2008 |
| 7249503 | Tube and die interface for liquid flow sensing through the tube A thermal sensor includes a die having a surface formed to accept the outer surface of tubing; a molded plastic part located on the die surface, said molded plastic part including flexible portions having a surface adapted to engage the bottom half of the circumfere... | 07/31/2007 |
| 7216534 | Substrate processing apparatus and thermal type flowmeter suitable to the same In a thermal type flowmeter 60, a heating/heat-sensitive coil 64 which is shaped as a coil is fit close into an approximately central portion of a duct pipe 63. A flow rate computing circuit 65 supplies electric power to the heating/heat-... | 05/15/2007 |
| 7178388 | Intake air flow detecting device for internal combustion engine An intake air flow detecting device is provided to an intake air passage, through which intake air flows into an internal combustion engine. Intake air flow is divided into a main passage and a bypass passage. The detecting device includes a thermal air flowmeter, a... | 02/20/2007 |
| RE39466 | Flow rate sensor implementing a plurality of inner tubes located within a sensor tube There is provided a flow rate sensor comprising: a pair of heating resistors operable to heat a sensor tube; a temperature sensor operable to control respective temperatures of the heating resistors; and a case operable to hold the heating resistors and the temperat... | 01/16/2007 |
| 7121139 | Thermal mass flow rate sensor having fixed bypass ratio A flow rate sensor includes a main conduit, a sensor tube and a bypass tube connecting an upstream portion of the main conduit to a downstream portion of the main conduit such that flow through the main conduit is divided through the sensor tube and the bypass tube,... | 10/17/2006 |
| 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 |
| 7059185 | System and method of measuring convection induced impedance gradients to determine liquid flow rates A method and system for measuring the flow rate of a liquid or gas within a flow channel utilizing a centrally located excitation source and a plurality of sensors. The excitation source is comprised of a heating element coupled with an alternating current generator... | 06/13/2006 |
| 7059192 | Pressure sensor A pressure sensor is a micro-electro-mechanical vibrating device, with a silicon substrate (15; 15′) onto which a single-layer or multilayer vibrating assembly (121; 221; 321) is formed. It comprises an electrode (21; 21′), which makes the a... | 06/13/2006 |
| 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 |
| 7049558 | Apparatus and method for heating microfluidic volumes and moving fluids A device and method for the temperature control, concentration, volume measurement and transport of microfluidic volumes are provided. The device includes one or more heating elements having a resistive material that varies with temperature. The heating elements are... | 05/23/2006 |
| 7028544 | Mass flowmeter for measuring by the CT method A mass flowmeter of the thermal type provided with a flow sensor with a flow tube through which a fluid can flow during operation, with a temperature sensor in an upstream position (A) and a heater (H) in a downstream position (B), and power control means and temper... | 04/18/2006 |
| 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 |
| 7021136 | Mass flow meter with symmetrical sensors A mass flow meter employs discrete chip-type temperature sensors to sense a fluid flow rate. The sensor can be a semiconductor chip such as SiC or silicon, or thin film tungsten on an AlN substrate. The sensors can be distributed symmetrically with respect to the co... | 04/04/2006 |
| 7016790 | In-line hot-wire sensor for slurry monitoring An in-line hot-wire sensor for monitoring the mixing and the flow rate of slurry is disclosed. The hot-wire sensor may include a number of resistors organized into a Wheatstone bridge, as well as a frequency-domain transform mechanism. The resistors include a hot-wi... | 03/21/2006 |
| 7000464 | Measuring and control of low fluid flow rates with heated conduit walls The flow of a fluid at low flow rates is measured in a flow sensing assembly and controlled without introducing measuring devices into the fluid flow path. The flow sensing assembly is enclosed in a housing to lessen ambient and fluid temperature change effects on t... | 02/21/2006 |
| 7000465 | Attitude error self-correction for thermal sensors of mass flow meters and controllers A system for and method of compensating for attitude sensitivity of at least two thermal sensor coils mounted on a tube through which a fluid flows along a common axis of flow for use in generating a flow measurement signal representative of the flow of fluid throug... | 02/21/2006 |
| 6988400 | Mass flowmeter having measuring ranges measured by two separate methods A flowmeter of the thermal type with a single flow sensor is connected to control and temperature measuring elements for measuring in a first measuring range by a first measuring method and in a second measuring range by a second measuring method. Detection elements... | 01/24/2006 |
| 6978680 | Dynamic pressure probe holder and method of obtaining a dynamic pressure signal A component adapted to transmit a dynamic pressure signal from a high temperature environment to a location where it can be measured without causing significant attenuation of the signal. In particular, the component provides for a dynamic pressure signal transmissi... | 12/27/2005 |
| 6962077 | System and method of measuring convection induced impedance gradients to determine liquid flow rates A method and system for measuring the flow rate of a liquid or gas within a flow channel utilizing a centrally located excitation source and a plurality of sensor means. Said excitation means is comprised of a heating element coupled with an alternating current gene... | 11/08/2005 |
| 6952962 | Mobile monolithic polymer elements for flow control in microfluidic devices A cast-in-place and lithographically shaped mobile, monolithic polymer element for fluid flow control in microfluidic devices and method of manufacture. Microfluid flow control devices, or microvalves that provide for control of fluid or ionic current flow can be ma... | 10/11/2005 |
| 6945106 | Mass flowmeter A mass flowmeter of the thermal type, having a planar, thin substrate with a sensing surface that can be brought into direct or indirect contact with a flowing fluid during a measurement, wherein electrically controllable heating elements and temperature sensor elem... | 09/20/2005 |
| 6923054 | Microscale out-of-plane anemometer A microscale out-of-plane thermal sensor. A resistive heater is suspended over a substrate by supports raised with respect to the substrate to provide a clearance underneath the resistive heater for fluid flow. A preferred fabrication process for the thermal sensor ... | 08/02/2005 |
| 6918295 | Thermal mass flow rate sensor providing increased rate of heat transfer to gas A sensing apparatus for use in a mass flow rate sensor for measuring a fluid flow rate includes a main conduit for containing a fluid flow, and a capillary tube for tapping a portion of the fluid flow from the main conduit at a first location, and returning the port... | 07/19/2005 |
