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Class Information
Number: 73/861.31
Name: Measuring and testing > Volume or rate of flow > By measuring vibrations or acoustic energy > Transit time of acoustic waves > Transmitted along parallel paths
Description: Subject matter wherein the acoustic waves are transmitted along plural upstream-downstream paths which are substantially parallel.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6947851 |
Transceiver circuit for an ultrasonic flowmeter |
Sep. 20, 2005 |
| 6907361 |
Ultrasonic flow-measuring method |
Jun. 14, 2005 |
| 6842716 |
Method and apparatus for measuring the propagation time of a signal, in particular a ultrasonic signal |
Jan. 11, 2005 |
| 6826965 |
Anti-parallel tag flow measurement system |
Dec. 7, 2004 |
| 6644119 |
Noninvasive characterization of a flowing multiphase fluid using ultrasonic interferometry |
Nov. 11, 2003 |
| 6552336 |
Non-invasive, opto-acoustic water current measurement system and method |
Apr. 22, 2003 |
| 6474174 |
Ultrasonic multi-channel flow measuring method |
Nov. 5, 2002 |
| 6460419 |
Ultrasonic flow measuring method |
Oct. 8, 2002 |
| 5907099 |
Ultrasonic device with enhanced acoustic properties for measuring a volume amount of fluid |
May. 25, 1999 |
| 5818735 |
Method and system for high resolution time-of-flight measurements |
Oct. 6, 1998 |
| 5777238 |
Driver-receiver apparatus for use with ultrasonic flowmeters |
Jul. 7, 1998 |
| 5747749 |
Acoustic logging to identify oil flow rate |
May. 5, 1998 |
| 5710379 |
Apparatus and method for determining a flow count |
Jan. 20, 1998 |
| 5546812 |
Method and device for determining characteristics of the flow of a medium |
Aug. 20, 1996 |
| 5515721 |
Local river flow velocity measuring method and apparatus therefor |
May. 14, 1996 |
| 5458004 |
Volume flow meter |
Oct. 17, 1995 |
| 4646575 |
Ultrasonic flowmeter |
Mar. 3, 1987 |
| 4452077 |
Borehole ultrasonic flow meter |
Jun. 5, 1984 |
| 4432243 |
Flow calculator with velocity curve fitting circuit means |
Feb. 21, 1984 |
| 4408589 |
Process and apparatus for operating an internal combustion engine |
Oct. 11, 1983 |
| 4365518 |
Flow straighteners in axial flowmeters |
Dec. 28, 1982 |
| 4336719 |
Ultrasonic flowmeters using waveguide antennas |
Jun. 29, 1982 |
| 4336606 |
Wind speed measurement |
Jun. 22, 1982 |
| 4317178 |
Multiple velocity traverse flow rate measuring technique |
Feb. 23, 1982 |
| 4300401 |
Method and apparatus for determining fluid flow |
Nov. 17, 1981 |
| 4109523 |
Method of determining acoustic flow meter correction factor |
Aug. 29, 1978 |
| 4103551 |
Ultrasonic measuring system for differing flow conditions |
Aug. 1, 1978 |
| 4102186 |
Method and system for measuring flow rate |
Jul. 25, 1978 |
| 4078428 |
Measurement of fluid flow |
Mar. 14, 1978 |
| 4028938 |
Acoustical flow meter |
Jun. 14, 1977 |
| 4024760 |
Fluid flow measurement apparatus |
May. 24, 1977 |
| 3940985 |
Fluid flow measurement system for pipes |
Mar. 2, 1976 |
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