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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6021677 |
Pipeline system for the controlled distribution of a flowing medium and method for operating such a pipeline system |
Feb. 8, 2000 |
| 6016710 |
Method and apparatus for measuring the quantity of outdoor air processed by an air preconditioning module |
Jan. 25, 2000 |
| 6003386 |
Disposable mass flow transducer |
Dec. 21, 1999 |
| 5908990 |
Apparatus for measuring the velocity of a fluid flowing in a conduit |
Jun. 1, 1999 |
| 5905208 |
System and method measuring fluid flow in a conduit |
May. 18, 1999 |
| 5895860 |
Heat exchanging medium pressure measuring apparatus |
Apr. 20, 1999 |
| 5837903 |
Device for measuring exhaust flowrate using laminar flow element |
Nov. 17, 1998 |
| 5834659 |
Device and method for measuring fluid flow in a conduit having a gradual bend |
Nov. 10, 1998 |
| 5827977 |
Device and method for measuring multi-phase fluid flow and density of fluid in a conduit having a gradual bend |
Oct. 27, 1998 |
| 5811690 |
Differential pressure transmitter with highly accurate temperature compensation |
Sep. 22, 1998 |
| 5802910 |
Measuring system for liquid volumes and liquid levels of any type |
Sep. 8, 1998 |
| 5763764 |
Evaporative emission tester |
Jun. 9, 1998 |
| 5717146 |
Device and method for measuring multi-phase fluid flow in a conduit having an abrupt gradual bend |
Feb. 10, 1998 |
| 5708211 |
Flow regime determination and flow measurement in multiphase flow pipelines |
Jan. 13, 1998 |
| 5641915 |
Device and method for measuring multi-phase fluid flow in a conduit using an elbow flow meter |
Jun. 24, 1997 |
| 5621657 |
Automatic detection of air flow transducer type under software control |
Apr. 15, 1997 |
| 5616841 |
Flow metering device for landfill gas extraction well |
Apr. 1, 1997 |
| 5591922 |
Method and apparatus for measuring multiphase flows |
Jan. 7, 1997 |
| 5563351 |
Method and apparatus for determining pump wear |
Oct. 8, 1996 |
| 5520969 |
Method for in-situ liquid flow rate estimation and verification |
May. 28, 1996 |
| 5515735 |
Micromachined flow sensor device using a pressure difference and method of manufacturing the same |
May. 14, 1996 |
| 5458006 |
Gas-metering device |
Oct. 17, 1995 |
| 5443075 |
Flow measuring apparatus |
Aug. 22, 1995 |
| 5429003 |
Moving sensor linear true mass flowmeter |
Jul. 4, 1995 |
| 5415049 |
System and method for measuring the speed of fluid flow of varying direction |
May. 16, 1995 |
| 5377524 |
Self-testing capacitive pressure transducer and method |
Jan. 3, 1995 |
| 5329463 |
Process gas distribution system and method with gas cabinet exhaust flow control |
Jul. 12, 1994 |
| 5323661 |
Laminar flow elbow system and method |
Jun. 28, 1994 |
| 5313955 |
Pulmonary flow head |
May. 24, 1994 |
| 5311662 |
Press metering apparatus and method |
May. 17, 1994 |
| 5228346 |
Method of determining gas flow volume |
Jul. 20, 1993 |
| 5178153 |
Fluid flow sensing apparatus for in vivo and industrial applications employing novel differential optical fiber pressure sensors |
Jan. 12, 1993 |
| 5174161 |
Wireline and coiled tubing retrievable choke for downhole flow measurement |
Dec. 29, 1992 |
| 5172592 |
Omnidirectional pressure sensing head |
Dec. 22, 1992 |
| 5129264 |
Centrifugal pump with flow measurement |
Jul. 14, 1992 |
| 5111827 |
Respiratory sampling device |
May. 12, 1992 |
| 5081448 |
Differential pressure indicator with temperature compensation |
Jan. 14, 1992 |
| 5022557 |
Computerized beverage dispensing system |
Jun. 11, 1991 |
| 4986135 |
Apparatus and method for measuring fluid flow and density |
Jan. 22, 1991 |
| 4972180 |
Apparatus for determining rate of discharge from nozzle for spraying aqueous solution of hydrogen peroxide |
Nov. 20, 1990 |
| 4938246 |
Cleaning tool for a valve manifold |
Jul. 3, 1990 |
| 4920808 |
Device and method for measuring the flow velocity of a free flow in three dimensions |
May. 1, 1990 |
| 4905161 |
Flow stability reporting system for a liquid chromatography system |
Feb. 27, 1990 |
| 4873989 |
Fluid flow sensing apparatus for in vivo and industrial applications employing novel optical fiber pressure sensors |
Oct. 17, 1989 |
| 4860594 |
Apparatus and method for measuring mass flow and density |
Aug. 29, 1989 |
| 4831875 |
Water trap valve for fail safe operation of an air inleakage monitoring system in a steam turbine |
May. 23, 1989 |
| 4825704 |
Fluid flow speed measuring apparatus |
May. 2, 1989 |
| 4821580 |
Method and apparatus for calculating flow rates through a pumping station |
Apr. 18, 1989 |
| 4754651 |
Differential pressure apparatus for measuring flow and velocity |
Jul. 5, 1988 |
| 4730500 |
Vortex generating mass flowmeter |
Mar. 15, 1988 |
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