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Class Information
Number: 73/204.15
Name: Measuring and testing > Volume or rate of flow > Thermal type > Including detail of feedback or rebalancing circuitry
Description: Subject matter under 204.11 describing a particular feature of the measuring circuit in which a portion of the circuit output is either (a) fed back to its input, or (b) used to control a circuit or circuit adjusting element which balances a bridge measuring circuit.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7614296 |
Method and device for fluid flow parameters determination |
Nov. 10, 2009 |
| 7587938 |
Thermal type flow meter including a secondary heating device to suppress heat transfer |
Sep. 15, 2009 |
| 7574909 |
Thermal flow sensor having an amplifier section for adjusting the temperature of the heating element |
Aug. 18, 2009 |
| 7568388 |
Thermal flow sensor having an amplifier section for adjusting the temperature of the heating element |
Aug. 4, 2009 |
| 7568387 |
Thermal flow sensor having an amplifier section for adjusting the temperature of the heating element |
Aug. 4, 2009 |
| 7565836 |
Thermal type flow sensor having a second control circuit to control a second heating resistor above the first heating temperature |
Jul. 28, 2009 |
| 7562569 |
Thermal flow sensor having an amplifier section for adjusting the temperature of the heating element |
Jul. 21, 2009 |
| 7536908 |
Micromachined thermal mass flow sensors and insertion type flow meters and manufacture methods |
May. 26, 2009 |
| 7498823 |
Physical quantity, particularly humidity detection device, and related detecting method |
Mar. 3, 2009 |
| 7490511 |
Flow sensor with flow-adaptable analog-digital-converter |
Feb. 17, 2009 |
| 7487674 |
Thermal flow sensor having an amplifier section for adjusting the temperature of the heating element |
Feb. 10, 2009 |
| 7401510 |
Heating resistor type airflow meter |
Jul. 22, 2008 |
| 7377185 |
Device and method of detecting flow rate/liquid kind, and device and method of detecting liquid kind |
May. 27, 2008 |
| 7337661 |
Thermal fluid flow meter having heat-generating resistor and temperature adjuster therefor |
Mar. 4, 2008 |
| 7325449 |
Thermal flow sensor having an amplifier section for adjusting the temperature of the heating element |
Feb. 5, 2008 |
| 7287424 |
Thermal type flow measurement apparatus having asymmetrical passage for flow rate measurement |
Oct. 30, 2007 |
| 7284424 |
Thermal air flow rate measuring apparatus and its flowmeter and internal combustion engine and thermal air flow rate measuring method using it |
Oct. 23, 2007 |
| 7272512 |
Flow sensor signal conversion |
Sep. 18, 2007 |
| 7251995 |
Fluid flow sensor |
Aug. 7, 2007 |
| 7225669 |
Heating resistance flow rate measuring apparatus |
Jun. 5, 2007 |
| 7213455 |
Thermal type gas flow measuring instrument |
May. 8, 2007 |
| 7205781 |
Mass air flow circuit having pulse width modulation feedback control |
Apr. 17, 2007 |
| 7201048 |
Measuring device for a flow sensor, in particular an air mass sensor for internal combustion engines and method for measuring air flows |
Apr. 10, 2007 |
| 7168312 |
Heating resistor type air flow meter |
Jan. 30, 2007 |
| 7155970 |
Heat-radiation type flow sensor |
Jan. 2, 2007 |
| 7117736 |
Flow sensor |
Oct. 10, 2006 |
| 7082824 |
Variable resistance sensor with common reference leg |
Aug. 1, 2006 |
| 7072776 |
Method of regulating resistance in a discontinuous time hot-wire anemometer |
Jul. 4, 2006 |
| 7066022 |
Airspeed sensor and method for operating an airspeed sensor |
Jun. 27, 2006 |
| 7058532 |
Flowmeter |
Jun. 6, 2006 |
| 7044714 |
System and method for controlling pumping of non-homogenous fluids |
May. 16, 2006 |
| 7013725 |
System and method for regulating bridge voltage in a discontinuous-time hot-wire anemometer |
Mar. 21, 2006 |
| 7011614 |
Infrared thermopile detector system for semiconductor process monitoring and control |
Mar. 14, 2006 |
| 7010971 |
Heating resistor type flow-measuring device having a heating resistor and a thermoresistance, whose resistance value varies in response to the ambient temperature |
Mar. 14, 2006 |
| 6973826 |
Heating resistance flow rate measuring apparatus |
Dec. 13, 2005 |
| 6935172 |
Thermal type flow measuring device |
Aug. 30, 2005 |
| 6889544 |
Thermal type flow rate detector |
May. 10, 2005 |
| 6860149 |
Mass airflow measuring apparatus |
Mar. 1, 2005 |
| 6845659 |
Variable resistance sensor with common reference leg |
Jan. 25, 2005 |
| 6840102 |
Flow amount measuring apparatus |
Jan. 11, 2005 |
| 6786088 |
Gas flow rate measuring apparatus |
Sep. 7, 2004 |
| 6769298 |
Gas flow rate measuring device having an integrated chip temperature sensor and adjustment processing circuit on common chip |
Aug. 3, 2004 |
| 6763711 |
Air flow sensor using measurement of rate of heat loss |
Jul. 20, 2004 |
| 6752014 |
Hot-wire type air flow meter for internal combustion engine |
Jun. 22, 2004 |
| 6681625 |
Constant-temperature-difference bidirectional flow sensor |
Jan. 27, 2004 |
| 6672153 |
Mass airflow measuring apparatus |
Jan. 6, 2004 |
| 6658931 |
Fluid flow sensing and control method and apparatus |
Dec. 9, 2003 |
| 6575027 |
Mass flow sensor interface circuit |
Jun. 10, 2003 |
| 6543282 |
Air flow detection apparatus |
Apr. 8, 2003 |
| 6539793 |
Flow rate detector |
Apr. 1, 2003 |
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