Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2005-03-22
2005-03-22
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
C073S866500
Reexamination Certificate
active
06868723
ABSTRACT:
A mass flow measurement apparatus including a flow path defined by a tubular side wall, a probe extending through the side wall into the flow path so that a first portion of the probe is located in the flow path and a second portion of the probe, extends out of the side wall, a heater element secured to the probe, and a seal preventing fluid flowing through the flow path from contacting the heater element.
REFERENCES:
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patent: 6023969 (2000-02-01), Feller
patent: 6642807 (2003-11-01), Gard
Mass Flow Meters and Controllers for Gases, Mass-Stream™, M+W Instruments, (12 pages).
TSI Mass Flowmeters, Theory of Operation, Copyright 2001, TSI Incorporated, (1 page).
Economical Thermal Mass Flow Sensor Based on Constant Temperature Anemometry, Lotters, Joost, Bronkhorst High-Tech B. V, presented at Sensor 99, May 18-20, 1999, Nurnberg, Germany, (6 pages).
Anastas Jeffrey Vincent
Kottenstette Nicholas Eugene
Myatt R. Leonard
Shajii Ali
Lefkowitz Edward
Mack Corey D.
MKS Instruments Inc.
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