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| Number | Title | Issue Date |
| 7661305 | Airflow detection apparatus An airflow detection apparatus configured to detect airflow of a fan includes a first transistor, an amplifier, an A/D converter, a microprocessor, an indicating circuit, and a stabilizing circuit configured for supplying a stable current to the first transistor. Th... | 02/16/2010 |
| 7371310 | Apparatus for producing a thin sample band in a microchannel system The present invention improves the performance of microchannel systems for chemical and biological synthesis and analysis by providing a method and apparatus for producing a thin band of a species sample. Thin sample bands improve the resolution of microchannel sepa... | 05/13/2008 |
| 7261812 | Multi-column separation devices and methods Chromatographic separation devices include multiple batch-processed columns joined by a body structure and adapted to perform parallel analyses. Both slurry-packed and monolithic column embodiments are provided. One or more liquid-permeable frits of various types ma... | 08/28/2007 |
| 7217351 | Valve for controlling flow of a fluid A valve for controlling flow of a primary fluid in a primary flow channel comprises a valve fluid channel, and a membrane of a porous dielectric material located in the channel so as to divide the channel into an inlet part and an outlet part and so that valve fluid... | 05/15/2007 |
| 7143645 | Meter housing assembly and method of assembly A water meter housing assembly (10) comprises a cylindrical, plastic housing body (11), a non-cast housing bottom (13) of hydroformable or stamped brass, a single-piece strainer and sealing member (40) that is disposed in the housing bott... | 12/05/2006 |
| 7093484 | Calibrating device for a water meter A water meter has a measurement insert disposed in a meter housing, a measurement display, an intake connection and a discharge connection. An impeller is disposed on a shaft in a measurement insert housing, also referred to as impeller bowl. A first shaft end of th... | 08/22/2006 |
| 7043980 | Measurement chamber for the measurement insert of a water meter A water meter has a measurement insert disposed in a meter housing, a measurement display, an intake connection and a discharge connection. An impeller is disposed on a shaft in a measurement insert housing, and a first shaft end of the shaft interacts with the meas... | 05/16/2006 |
| 6988402 | 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... | 01/24/2006 |
| 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 |
| 6925867 | Fluid meter, in particular water meter with volumetric measurement chamber A fluid meter, in particular a water meter, comprises a tank having a bottom and into which is inserted through an opening opposite the bottom in an insertion direction parallel to its axis of symmetry a measurement chamber having at least one lateral orifice connec... | 08/09/2005 |
| 6865939 | Fluorinated silica microchannel surfaces A method for surface modification of microchannels and capillaries. The method produces a chemically inert surface having a lowered surface free energy and improved frictional properties by attaching a fluorinated alkane group to the surface. The coating is produced... | 03/15/2005 |
| 6782746 | 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... | 08/31/2004 |
| 6619116 | Volumetric liquid meter having a part of the chamber formed with multi-materials A volumetric liquid meter of the oscillating piston type having a chamber, includes a bottom portion, a fixed partition, a piston and a filter. At least one element forming the chamber is formed by at least two materials presenting different mechanical ch... | 09/16/2003 |
| 6490918 | Piston-type quantity meter A piston-type quantity meter including a metering chamber having a bottom, a cylindrical chamber shell, a cover, a central journal, a guide ring, two inlet opening formed, respectively, in the chamber bottom and the chamber cover, and a radial outlet open... | 12/10/2002 |
| 6250151 | Fluid flow meter incorporating magnetic detector A device for measuring fluid volume output by a pump includes a meter housing having an inlet and an outlet through which the fluid flows. At least two inter-engaging screw spindles are rotatably mounted within the meter housing and are rotatable in respo... | 06/26/2001 |
| 5808196 | Blocking rotor and housing for flow meter A fluid flow meter has a housing within which inlet and outlet displacement rotors flank a blocking rotor. The end plates of the housing rotatably support all three rotors which rotate in a timed sequence in response to the passage of fluid through the me... | 09/15/1998 |
| 5773718 | Device for measuring liquid volume of the cylindrical piston meter type Device for measuring liquid volume in the manner of a cylindrical piston meter with a cylindrical measuring chamber with connecting channels running perpendicularly to the cylinder axis of the measuring chamber and with a cylindrical piston inserted eccen... | 06/30/1998 |
| 5576489 | Measuring device for oscillating piston liquid meter A measuring device for a liquid meter with oscillating piston comprises a hollow chamber pierced with two apertures and limited by a cylindrical side wall, a bottom and a lid; a piston enclosed in said chamber and held movably, along a partition wall abou... | 11/19/1996 |
| 5513529 | Housing assembly for flow meter An improved industrial meter housing assembly includes a compactly designed metal housing having a central trefoil shaped chamber and minimal length inlet and outlet ports in fluid communication with the chamber with the ports ending at inlet and outlet p... | 05/07/1996 |
| 5440925 | Flow calibrator The invention relates to a high accuracy flowmeter for testing and calibrating flowmeters and the like, and more particularly to a positive displacement flowmeter which may include a cylinder (12), a piston (10) within the cylinder (12) which makes a clea... | 08/15/1995 |
| 5395220 | Speed detector of scroll-type fluid machine A speed detector of a scroll-type fluid machine in which a fixed scroll and an orbiting scroll, each of which includes a spiral wrap disposed on the inner surface of an end plate thereof, are engaged with each other and housed in a closed housing, and the... | 03/07/1995 |
| 5327788 | Rotor operation in a vortex chamber flowmeter In a vortex chamber flow meter, a bearingless annular rotor rotates about an axis in a cylindrical operating chamber. The chamber is enclosed in a jet ring within a meter housing. Liquid enters the housing and flows to a plurality of circumferentially spa... | 07/12/1994 |
| 5269668 | Folding-unfolding rotating flap meter-motor-pump A positive displacement fluid handling apparatus comprises a body including a circular cylindrical cavity with two closed ends and two port openings respectively open to the two opposite halves of the circular cylindrical cavity; a flap assembly including... | 12/14/1993 |
| 5261275 | Water meter system A device which monitors the through passage of incompressible fluids such as water that relies upon a nutating disk-type transducer associated with a spherical hollow core. The disk includes a spindle which precesses in the presence of a sensor. A display... | 11/16/1993 |
| 5259244 | Sinewave flowmeter A flowmeter has two moving parts, a rotor with a cylindrical core and the radially extending sinusoidal curving vane. A slider has a gate opening which fits on the vane for reciprocating axially as the rotor turns. The slider and rotor are held within a c... | 11/09/1993 |
| 5251480 | Frost-proof drive shaft for water meter An improved drive shaft for a positive displacement type water meter includes a flexible spring arm formed on one end of the shaft for engaging the drive spindle of a nutating disk measuring element disposed within a water meter. The other end of the driv... | 10/12/1993 |
| 5150612 | Dual revolving vane pump-motor-meter A positive displacement apparatus usable as a pump or motor or flowmeter comprises a first revolving vane rotatably disposed in a first cylindrical cavity wherein the edge of the first revolving vane sweeps on a circular cylindrical portion of the cylindr... | 09/29/1992 |
| 5027653 | Flowmeters having rotors with grooved bores and lands A flowmeter has meshing rotors mounted on shafts. The bores of the rotors have plural longitudinally extending grooves which flow materials through the grooves and out of the bores to promote long, accurate running of the flowmeters. Radial faces of count... | 07/02/1991 |
| 5010767 | Modular device for measuring the volumetric flow rate of a liquid, particularly a lubricant fluid, in a hydraulic circuit A device for measuring the volumetric flow rate of a fluid, particularly a lubricant fluid in a hydraulic circuit, comprising a distributor block provided with an entry bore and an exit bore, and a feed duct and return duct respectively to and from a meas... | 04/30/1991 |
| 4996888 | Fluid flowmeter A fluid volumetric flowmeter has a wall plate forming a chamber and a fluid inlet, and a fluid outlet. Two rotors positioned within the chamber have intermeshing lobes and valleys for turning in the chamber as fluid flows from the inlet through the chambe... | 03/05/1991 |
| 4953403 | Positive displacement flushable flow meter A positive displacement flushable flow meter has sensing elements that are rotated by and at a rate in accordance with a flow of fluid through the flow meter. The flow meter is particularly adapted for measuring the volume flow rate of coating material su... | 09/04/1990 |
| 4848164 | Liquid flow meter A liquid flow meter of the type having a positive displacement rotatable member responsive to liquid flow, with a permanent magnet affixed to the rotatable member. A magnetically-operable reed switch is located proximate the reed switch, but outside the l... | 07/18/1989 |
| 4827767 | Flow meter A flow meter has a rotor with vanes. The rotor is mounted with sealing clearances in a casing and defines therewith a working space. The casing has fluid admission and discharge ports and recesses for accommodation of rollers. Peripheries of the rollers d... | 05/09/1989 |
| 4534227 | Device for measuring the flow of a fluid The device measures the flow of a fluid and comprises a rotor 16 having vanes which is driven in rotation by a stream of fluid in a sealed housing 11 having a circular cross-section and provided with a supply nozzle and a discharge nozzle for the fluid wh... | 08/13/1985 |
| 4499764 | Modular metering apparatus A modular oscillating piston-type fluid meter including a plurality of three or more oscillating piston measuring modules in stacked relationship to each other, each of the measuring modules having a piston operatively connected for synchronous, conjoint ... | 02/19/1985 |
| 4487064 | Internal gate rotary vane fluid meter with controlled rotor vane inner diameter An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the fluid meter has a gate with at least two ... | 12/11/1984 |
| 4481812 | Internal gate rotary vane fluid meter with controlled rotor vane aspect ratio An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the vanes are dimensioned to each have a leng... | 11/13/1984 |
| 4479384 | Internal gate rotary vane fluid meter with improved element geometry An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the outer diameter of the gate is the maximum... | 10/30/1984 |
| 4478079 | Internal gate rotary vane fluid meter with contoured inlet and outlet passages An internal gate rotary vane fluid meter which has markedly improved performance as a result of precise control over the geometry and dimensions of the rotating elements and the fluid flow path. In particular, the outer diameter of the gate is maximized a... | 10/23/1984 |
| 4478078 | Direct gearless drive mechanism for an internal gate rotary vane fluid meter An internal gate rotary vane fluid meter is provided with a direct gearless drive between the rotor and the gate mounted on parallel displaced shafts inside a housing. A plurality of timing discs mounted on the rotor are utilized for drivingly coupling an... | 10/23/1984 |
