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Class Information
Number: 73/861.53
Name: Measuring and testing > Volume or rate of flow > Using differential pressure > With restriction > Automatically variable restriction
Description: Subject matter wherein the effective area of the restriction is automatically varied by the differential pressure created.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7377184 |
Multipurpose centralized flow detector |
May. 27, 2008 |
| 7302863 |
Software correction method and apparatus for a variable orifice flow meter |
Dec. 4, 2007 |
| 7270143 |
Offset variable-orifice flow sensor |
Sep. 18, 2007 |
| 7131451 |
Apparatus for controlling and metering fluid flow |
Nov. 7, 2006 |
| 7096744 |
Software correction method and apparatus for a variable orifice flow meter |
Aug. 29, 2006 |
| 7082842 |
Software correction method and apparatus for a variable orifice flow meter |
Aug. 1, 2006 |
| 7082843 |
Fluid flow measurement device |
Aug. 1, 2006 |
| 6898984 |
Measuring apparatus to determine the flow of a fluid |
May. 31, 2005 |
| 6892586 |
Measuring and controlling the flow of flowable materials |
May. 17, 2005 |
| 6874374 |
Flowmeter apparatus |
Apr. 5, 2005 |
| 6668665 |
Gas level monitoring system and gas flow rate sensor used therein |
Dec. 30, 2003 |
| 6619138 |
Apparatus for dynamically adjusting size of an orifice to increase accuracy in measuring the rate of air flow |
Sep. 16, 2003 |
| 6539813 |
Throttle structure and flow meter incorporated with throttle structure |
Apr. 1, 2003 |
| 6508071 |
Air conditioner and displacement control valve for variable displacement compressor |
Jan. 21, 2003 |
| 6405577 |
Flow rate detector mechanism with variable venturi and exhaust gas sampling method using the same |
Jun. 18, 2002 |
| 6196070 |
Flow sensor with wide dynamic range |
Mar. 6, 2001 |
| 5979247 |
Flow sensor having a fixed resistance and a variable resistance |
Nov. 9, 1999 |
| 5970801 |
Variable orifice flow sensor |
Oct. 26, 1999 |
| 5937970 |
Compressed air lubricators |
Aug. 17, 1999 |
| 5880378 |
Critical flow venturi with variable and continuous range |
Mar. 9, 1999 |
| 5763792 |
Respiratory flow sensor |
Jun. 9, 1998 |
| 5747702 |
Diagnostic device for hydraulic circuit |
May. 5, 1998 |
| 5698793 |
Flow meters |
Dec. 16, 1997 |
| 5691914 |
Fluid flow measurement correcting system, and methods of constructing and utilizing same |
Nov. 25, 1997 |
| 5672833 |
Peak flow meter for measuring ventilatory capacity |
Sep. 30, 1997 |
| 5665923 |
Full range-high accuracy air flow sensing device |
Sep. 9, 1997 |
| 5654512 |
Flexible membrane variable orifice fluid flow meter |
Aug. 5, 1997 |
| 5627324 |
Peak flow meter |
May. 6, 1997 |
| 5565630 |
Peak flow meter |
Oct. 15, 1996 |
| 5458007 |
Bi-directional flow indicator |
Oct. 17, 1995 |
| 5351557 |
Rotary flowmeter with varying area channel |
Oct. 4, 1994 |
| 5303738 |
Control valve |
Apr. 19, 1994 |
| 5253536 |
Rotary flowmeter with variable inlet |
Oct. 19, 1993 |
| 5187988 |
Apparatus for measuring the flow of a fluid medium |
Feb. 23, 1993 |
| 5153823 |
Device to measure and/or control flow-through and/or quantity of heat |
Oct. 6, 1992 |
| 5125753 |
Device to measure flow-through and/or quantity of heat |
Jun. 30, 1992 |
| 5079943 |
Method of calibrating a volumetric fluid flow sensor |
Jan. 14, 1992 |
| 5038621 |
Variable area obstruction gas flow meter |
Aug. 13, 1991 |
| 5033312 |
Gas flow meter housing |
Jul. 23, 1991 |
| 5033311 |
Volumetric fluid flow sensor |
Jul. 23, 1991 |
| 4993269 |
Variable orifice flow sensing apparatus |
Feb. 19, 1991 |
| 4938076 |
Target fluid flow indicator gauge |
Jul. 3, 1990 |
| 4918994 |
Gas meter |
Apr. 24, 1990 |
| 4905844 |
Method for monitoring ranges of volumetric fluid flow |
Mar. 6, 1990 |
| 4875377 |
Flowmeters |
Oct. 24, 1989 |
| 4864871 |
Transducer for fluid flow |
Sep. 12, 1989 |
| 4838093 |
Flow meter and method of measuring flow |
Jun. 13, 1989 |
| 4827774 |
Flow sensing device |
May. 9, 1989 |
| 4825747 |
Method and device for detecting a fluid flow rate |
May. 2, 1989 |
| 4823552 |
Failsafe electrohydraulic control system for variable displacement pump |
Apr. 25, 1989 |
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