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Class Information
Number: 73/861.52
Name: Measuring and testing > Volume or rate of flow > Using differential pressure > With restriction
Description: Subject matter wherein the differential pressure is created by a restriction located in the flow path.

Sub-classes under this class:

Class Number Class Name Patents
73/861.53 Automatically variable restriction 84
73/861.59 Including recirculation pump 4
73/861.61 Orifice or flow nozzle 125
73/861.63 Venturi 150

Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8590561 Pressure sensor, differential pressure type flow meter, and flow rate controller Nov. 26, 2013
8585608 Flow meter for pulmonary function tests Nov. 19, 2013
8578789 Analysis device and analysis method Nov. 12, 2013
8549930 Method of evaluating grease and extrusion die for the method Oct. 8, 2013
8522625 Flow measuring apparatus including a deflectable membrane applied to a constriction Sep. 3, 2013
8521450 Gas/liquid flow rate determination Aug. 27, 2013
8511180 Pressure difference flowmeter with flow barrier between a conduit and a reference tube Aug. 20, 2013
8499648 Gas meter Aug. 6, 2013
8479733 System and method for a flow sensor Jul. 9, 2013
8448525 Differential pressure based flow measurement May. 28, 2013
8429985 Apparatus for use in determining a plurality of characteristics of a multiphase flow within a pipe Apr. 30, 2013
8397586 Flow sensor assembly with porous insert Mar. 19, 2013
8393228 Method and system for measuring a flow Mar. 12, 2013
8376312 Flow restrictor Feb. 19, 2013
8365765 Flow restrictor cartridge for fluid flow measurements Feb. 5, 2013
8290633 Method for operating a fluidic pipeline system Oct. 16, 2012
8286505 Method and system for measuring flow at patient utilizing differential force sensor Oct. 16, 2012
8286504 Arrangement for improving accuracy of pressure measurement and flow sensor Oct. 16, 2012
8281669 Simplified orifice type differential pressure flow meter with improved accuracy Oct. 9, 2012
8225814 Differential-pressure flowmeter and flow-rate controller Jul. 24, 2012
8205635 Flowmeter and flow-rate controller Jun. 26, 2012
8141432 Single and multiphase fluid measurements using a coriolis meter and a differential pressure flowmeter Mar. 27, 2012
8132470 Fluid flow detector having a mobile body moving between a detection channel and a discharge channel Mar. 13, 2012
8091436 Differential force sensor Jan. 10, 2012
8082745 Refrigeration cycle system Dec. 27, 2011
8065923 Method and apparatus for measuring the flow rates of the individual phases of a multiphase fluid mixture Nov. 29, 2011
8061218 Fluid flow detector Nov. 22, 2011
8056409 Hybrid flowmeter that includes an integral vortex flowmeter and a differential flow meter Nov. 15, 2011
8006572 Differential-pressure flow meter and flow-rate controller Aug. 30, 2011
8006571 Air flow measurement Aug. 30, 2011
7992454 Airflow bench with laminar flow element Aug. 9, 2011
7942069 Fluid handling device with isolating chamber May. 17, 2011
7891256 Differential-pressure flow meter having a main control board in a space in a base member Feb. 22, 2011
7881886 Methods for performing transient flow prediction and verification using discharge coefficients Feb. 1, 2011
7832283 Fluid flow meter and mixer having a fluid displacement member with sloped walls Nov. 16, 2010
7819022 Method and device for recording characteristic state, amount and composition of a flowing medium Oct. 26, 2010
7784361 Electronic fluid dispensing apparatus and related method Aug. 31, 2010
7782461 Flow rate measuring device Aug. 24, 2010
7775127 Method and system for measuring flow at patient utilizing differential force sensor Aug. 17, 2010
7775126 Fluid flow monitor Aug. 17, 2010
7770469 Differential pressure measurement device having a microwave resonator with a flexible member Aug. 10, 2010
7716994 Single and multiphase fluid measurements using a Coriolis meter and a differential pressure flowmeter May. 18, 2010
7698958 Differential pressure means for a gas meter arrangement, comprising an improved flow geometry Apr. 20, 2010
7681461 Pipe adapter for adjusting the flow past a sensor Mar. 23, 2010
7672796 Method to evaluate a performance of a control valve and a system thereof Mar. 2, 2010
7654154 Conditioning orifice plate with pipe wall passages Feb. 2, 2010
7650799 Method and apparatus for investigating a gas-liquid mixture Jan. 26, 2010
7637167 Apparatus and method for characterizing two phase fluid flow Dec. 29, 2009
7631562 Mass-flow sensor with a molded flow restrictor Dec. 15, 2009
7610817 Orifice member, and differential-pressure flow meter and flow-regulating apparatus using the same Nov. 3, 2009

1 2 3 4 5 6

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