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Class Information
Number: 73/861.54
Name: Measuring and testing > Volume or rate of flow > Using differential pressure > With restriction > Automatically variable restriction > Slotted piston or cylinder
Description: Subject matter wherein the effective area of the restriction is varied by relative movement of an apertured or slotted piston or cylinder.










Patents under this class:

Patent Number Title Of Patent Date Issued
7130750 Flow meter with magnetoresistive sensors and method of measuring flow Oct. 31, 2006
6210565 Hydraulic filter head-mounted flowmeter Apr. 3, 2001
6164141 Gas delivery sensor and respiratory aid appliance comprising such a sensor Dec. 26, 2000
6121884 Gas flow detector Sep. 19, 2000
5827978 Flow transducer Oct. 27, 1998
5743270 Resistive element for spirometer Apr. 28, 1998
5456107 Modular gas flowmeter Oct. 10, 1995
5440925 Flow calibrator Aug. 15, 1995
5337617 Gas flow meter Aug. 16, 1994
5313844 Flow transducer May. 24, 1994
5131277 Reverse osmosis system Jul. 21, 1992
5115684 Flowmeter for measuring the rate of fluid flow in a conduit May. 26, 1992
5033644 Precision dispensing of varying viscosity fluids in a prescribed mix ratio Jul. 23, 1991
5024105 Viscosity-insensitive variable-area flowmeter Jun. 18, 1991
4937558 Flow failure detector Jun. 26, 1990
4905844 Method for monitoring ranges of volumetric fluid flow Mar. 6, 1990
4838093 Flow meter and method of measuring flow Jun. 13, 1989
4787253 Electronic display flow meter Nov. 29, 1988
4619146 Flow meter Oct. 28, 1986
4567777 Device for measuring the throughflow of liquids and gases Feb. 4, 1986
4528858 Flow meter Jul. 16, 1985
4507976 Flow meter with hall effect sensor and method Apr. 2, 1985
4489614 Flowmeter Dec. 25, 1984
4479377 Method and apparatus for measuring gas flow Oct. 30, 1984
4466293 Volume flow meter for a flowing medium Aug. 21, 1984
4459859 Flowmeter Jul. 17, 1984
4434670 Fluid flow meter Mar. 6, 1984
4368646 Flow meter for liquid or gaseous media Jan. 18, 1983
4361051 Flowmeter Nov. 30, 1982
4350050 Flow transducer Sep. 21, 1982
4315436 Flow-rate transducer with electrical output Feb. 16, 1982
4304136 Electrical transducer responsive to fluid flow Dec. 8, 1981
4300402 Flow measuring needle and orifice for flow meter Nov. 17, 1981
4194394 Flow meter Mar. 25, 1980
4122863 Differential pressure overflow valve Oct. 31, 1978
4122839 Apparatus for the determination of respiratory passageway resistance Oct. 31, 1978
4034606 Gas flow transducer utilizing rolling piston Jul. 12, 1977
3937082 Gauge system for measuring air flow in ducts Feb. 10, 1976
3933040 Flowmeter Jan. 20, 1976











 
 
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