Measuring and testing – Volume or rate of flow – Thermal type
Reexamination Certificate
2007-02-21
2008-12-30
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Volume or rate of flow
Thermal type
C073S204260
Reexamination Certificate
active
07469583
ABSTRACT:
A flow sensor readily obtains high sensitivity without errors due to tilting. The flow sensor includes a flow channel having a pair of parallel portions and temperature sensing resistors for heating a fluid to a preset temperature. The temperature sensing resistors are disposed on parts of the parallel portions of the flow channel, to detect a fluid flow rate based on a change in temperature distribution of a flow channel due to a change in flow rate of the fluid flowing through the flow channel. The temperature sensing resistors include a first upstream temperature sensing resistor and a first downstream temperature sensing resistor that are disposed in a line on upstream and downstream sides of one of the parallel portions, respectively; and a second upstream temperature sensing resistor and a second downstream temperature sensing resistor that are disposed in a line on upstream and downstream sides of the other parallel portion, respectively.
REFERENCES:
patent: 3938384 (1976-02-01), Blair
patent: 4517838 (1985-05-01), Wachi et al.
patent: 4519246 (1985-05-01), Hartemink
patent: 4815280 (1989-03-01), Tujimura et al.
patent: 5191793 (1993-03-01), Drexel et al.
patent: 5792952 (1998-08-01), Ritchart
patent: 6318171 (2001-11-01), Suzuki
patent: 6477901 (2002-11-01), Tadigadapa et al.
patent: 6637264 (2003-10-01), Lotters et al.
patent: 6647778 (2003-11-01), Sparks
patent: 6883370 (2005-04-01), Vincze et al.
patent: 7021136 (2006-04-01), Vincze et al.
Dunlap Jonathan
Lefkowitz Edward
MKS Japan Inc.
Wenderoth , Lind & Ponack, L.L.P.
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