Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2006-06-13
2006-06-13
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
Reexamination Certificate
active
07059185
ABSTRACT:
A method and system for measuring the flow rate of a liquid or gas within a flow channel utilizing a centrally located excitation source and a plurality of sensors. The excitation source is comprised of a heating element coupled with an alternating current generator. Of the plurality of sensors, at least one of the sensors is located in a position upstream of the excitation source location, and additionally a second of the plurality of sensors is located in a position downstream of the excitation source. Instantaneous fluid flow rate is calculated utilizing a high gain differential amplifier electrically coupled to the sensors, wherein the convectively induced inductive gradient of the flowing fluid is compared to the symmetrical zero flow induction gradient. Following such a comparison, a voltage signal proportional to the flow of fluid within the channel is derived.
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Fadgen Keith
Gerhardt Geoff C.
Hanley, Esq. Elizabeth A.
Lahive & Cockfield LLP
Lefkowitz Edward
Mack Corey D.
Waters Investments Limited
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