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Class Information
Number: 73/861.42
Name: Measuring and testing > Volume or rate of flow > Using differential pressure
Description: Subject matter wherein the velocity of the fluid to be metered creates a pressure differential or kinetic head across (a) a flow restriction such as a Venturi, flow nozzle or orifice plate, or (b) a Pitot or like device, which differential or head is substantially proportional to a function of the velocity of the fluid.

Sub-classes under this class:

Class Number Class Name Patents
73/861.69 Centrifugal 9
73/861.65 Pitot 147
73/861.49 Pressure applied to liquid column or reservoir 22
73/861.47 Pressure applied to movable member (e.g., a diaphragm) 99
73/861.52 With restriction 263
73/861.43 With time integration 10

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8650948 Automatic seepage meter Feb. 18, 2014
8649931 Cooling system for vehicle Feb. 11, 2014
8640441 Method of monitoring a differential pressure sensor of an exhaust gas treatment system Feb. 4, 2014
8578788 Device and method for continuously measuring horizontal flux of dustfall in atmosphere Nov. 12, 2013
8576666 Graphical user interface for flow noise modeling, analysis, and array design Nov. 5, 2013
8567242 Pressure sensor venting system Oct. 29, 2013
8561480 Erosion-resistant insert for flow measurement devices Oct. 22, 2013
8555731 Self-contained tubular compressed-flow generation device for use in making differential measurements Oct. 15, 2013
8521450 Gas/liquid flow rate determination Aug. 27, 2013
8515694 Methods and systems for gauging multiple hydrocarbon fuel mixtures Aug. 20, 2013
8490645 Pressure sensor, pressure-differential flow rate meter, and flow rate controller Jul. 23, 2013
8453517 Pressure guiding tube blockage diagnosing device and blockage diagnosing method Jun. 4, 2013
8448515 Differential pressure measuring probe with bottoming indicator May. 28, 2013
8393227 Substrate processing method, storage medium storing program for executing the same, substrate processing apparatus, and fault detection method for differential pressure flowmeter Mar. 12, 2013
8356524 Device for collecting and separating particles and microorganisms present in ambient air Jan. 22, 2013
8347737 Pressure sensor for use in fuel cell systems Jan. 8, 2013
8336397 Method for manufacturing or testing metered-dose-ejection devices and testing apparatus therefore Dec. 25, 2012
8327720 Air sampling apparatus and method Dec. 11, 2012
8255174 Method and device for determining critical buffeting loads on a structure of an aircraft Aug. 28, 2012
8225814 Differential-pressure flowmeter and flow-rate controller Jul. 24, 2012
8197439 Fluid volume determination for medical treatment system Jun. 12, 2012
8186230 System and method for airflow sensing and monitoring May. 29, 2012
8171803 Air sampling apparatus and method May. 8, 2012
8147757 Filter with memory, communication and concentration sensor Apr. 3, 2012
8141435 Pressure measurement for flow metering device Mar. 27, 2012
8137983 Method of maintaining a protein concentration at a tangential flow filter Mar. 20, 2012
8084259 Method of insuring the integrity of a filtering element Dec. 27, 2011
8074460 Device for adjusting temperature and humidity using wind power Dec. 13, 2011
8069734 Multi-vortex flowmeter integrating pressure gauge Dec. 6, 2011
8065925 Sensor unit having a measuring probe and a housing part with sensors and a computing unit integrated in the housing part Nov. 29, 2011
8065923 Method and apparatus for measuring the flow rates of the individual phases of a multiphase fluid mixture Nov. 29, 2011
8024982 Duct-mountable sensing unit Sep. 27, 2011
8006571 Air flow measurement Aug. 30, 2011
7992453 Erosion-resistant insert for flow measurement devices Aug. 9, 2011
7942069 Fluid handling device with isolating chamber May. 17, 2011
7945414 Method for detecting abnormality in fluid supply line using fluid control apparatus with pressure sensor May. 17, 2011
7905141 Path structure related to flow of fluid to be measured and pressure difference detection in servo type volumetric flowmeter Mar. 15, 2011
7905142 Servo type volumetric flowmeter employing a pump unit system Mar. 15, 2011
7810400 Velocity based method for determining air-fuel ratio of a fluid flow Oct. 12, 2010
7798017 Ram pressure probe having two ducts and a differential pressure increasing element Sep. 21, 2010
7770469 Differential pressure measurement device having a microwave resonator with a flexible member Aug. 10, 2010
7765879 Flow control valve for measuring flow coefficient and flow rate Aug. 3, 2010
7672794 System and method for operating a flow process Mar. 2, 2010
7603916 Wet gas metering using a differential pressure and a sonar based flow meter Oct. 20, 2009
7587948 Flow rate measurement for industrial sensing applications using unsteady pressures Sep. 15, 2009
7549347 Multiple differential volume tube measurement quantitative conveying device and its conveying method thereof Jun. 23, 2009
7519483 Unsteady flow meter Apr. 14, 2009
7513940 Air sampling apparatus and method Apr. 7, 2009
7503227 Method and apparatus for measuring parameters of a fluid flow using an array of sensors Mar. 17, 2009
7475596 Non-destructive testing of pipes Jan. 13, 2009

1 2 3 4

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