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Class Information
Number: 73/196
Name: Measuring and testing > Volume or rate of flow > System > Flow comparing
Description: Systems wherein two or more flows are constantly compared and their ratio indicated, or where comparison is made of the flow of the same stream at two or more points.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8549907 Fluid distribution device, micro plant, method of designing fluid distribution device, and method of detecting blockage of flow channel Oct. 8, 2013
8322206 Apparatus and method for determining a fluid flow state Dec. 4, 2012
8265887 Flow measurement apparatus and program thereof, flow measurement method and fluid supply system Sep. 11, 2012
7962293 Apparatus and method for providing a stratification metric of a multiphase fluid flowing within a pipe Jun. 14, 2011
7962576 Quantity conversion interface for external program calls Jun. 14, 2011
7925457 Flow meter and airflow measurement using an airfoil Apr. 12, 2011
7849737 Gas meter Dec. 14, 2010
7707897 Method of measuring multiphase flow using a multi-stage flow meter May. 4, 2010
7663503 Meter register having an encoder for measuring material flow and an algorithm to selectively block signal transmission Feb. 16, 2010
7552614 System and method for determining functionality or accuracy of a sensor Jun. 30, 2009
7487673 Ice detection based on anemometry Feb. 10, 2009
7266467 Method to calibrate hydraulic flow valves in situ Sep. 4, 2007
7249486 Method for monitoring a sensor Jul. 31, 2007
7162921 Measuring device for measuring the volume flow or the substance properties of a gas, whose direction of flow can reverse Jan. 16, 2007
6986283 Method and apparatus for exchanging fluid in a transmission system Jan. 17, 2006
6917891 Systems and methods for diagnosing and predicting fluid flow systems using sensors Jul. 12, 2005
6721674 Method and apparatus for in-situ calibration of quantity measurement of a fluid flowing in a channel Apr. 13, 2004
6659087 Detection of EVAP purge hydrocarbon concentration Dec. 9, 2003
6553827 Coolant safety method for welding apparatus Apr. 29, 2003
6377190 System for monitoring water consuming structures in an individual unit of a multi-unit building Apr. 23, 2002
6237408 Coolant safety system for automated welding apparatus May. 29, 2001
6234014 Method and apparatus for analyzing gas flow through conduits May. 22, 2001
6202475 Predicting logarithmic reduction values Mar. 20, 2001
6073483 Device for measuring the viscosity of a fluid Jun. 13, 2000
6026682 Coolant safety system for automated welding apparatus Feb. 22, 2000
6026838 Method for detecting opening in fluid flow passageway and shutting off flow in response thereto Feb. 22, 2000
RE36401 Tandem rotor turbine meter and field calibration module Nov. 23, 1999
5950667 Apparatus for detecting opening in fluid flow passageway and shutting off flow in response thereto Sep. 14, 1999
5811674 Coolant safety system for welding apparatus Sep. 22, 1998
5808188 Flowbench and air flow measurement and calibration procedure Sep. 15, 1998
5739429 Powder coating system incorporating improved method and apparatus for monitoring flow rate of entrained particulate flow Apr. 14, 1998
RE35639 Method and apparatus for measuring ratio of mass flow rates and energy flow in a gas pipeline Oct. 21, 1997
5520969 Method for in-situ liquid flow rate estimation and verification May. 28, 1996
5473932 Tandem rotor turbine meter and field calibration module Dec. 12, 1995
5455781 Apparatus and method for determining the measurement accuracy of electronic gas meters Oct. 3, 1995
5377101 Urinary flow classification system and method Dec. 27, 1994
5298886 Fluidic flowmeter equipped with a micro flow sensor Mar. 29, 1994
5226728 Method and apparatus for measuring mass flow and energy content using a differential pressure meter Jul. 13, 1993
5201581 Method and apparatus for measuring mass flow and energy content using a linear flow meter Apr. 13, 1993
5095983 Multiphase production evaluation method using thru-tubing, wireline packoff devices Mar. 17, 1992
5050438 Method and apparatus for measuring the flow of heavy crude Sep. 24, 1991
5003810 Fluid meter Apr. 2, 1991
4938053 Fluid metering system Jul. 3, 1990
4930343 Apparatus for measuring and controlling fluid flow across a boundary Jun. 5, 1990
4928048 Fast response control circuit May. 22, 1990
4905511 Fan assembly and a method for checking the function thereof Mar. 6, 1990
4850220 Apparatus for measuring amount of ultrafiltrate and concentration of receiving solvent in dialysis Jul. 25, 1989
4781068 Differential mass flowmeter Nov. 1, 1988
4778107 Fuel injection valve assembly and an assembling method therefor Oct. 18, 1988
4753095 Method for determining real gas effects in critical flow nozzles Jun. 28, 1988

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