Measuring and testing – Gas analysis – Moisture content or vapor pressure
Reexamination Certificate
2007-05-29
2007-05-29
Williams, Hezron (Department: 2856)
Measuring and testing
Gas analysis
Moisture content or vapor pressure
C073S335020
Reexamination Certificate
active
11253703
ABSTRACT:
A capacitive humidity sensor for detecting a humidity change includes a first sensor element having a first capacitance, a second sensor element having a second capacitance and connected in series with the first sensor element, and a humidity sensitive layer having a dielectric constant, which changes in accordance with humidity. The first and the second capacitances change with respect to the humidity change at a different rate. The humidity is detected using the different capacitances of the first and the second sensor elements. The humidity sensitive layer is formed to each sensor element so that each sensor element can be effectively protected.
REFERENCES:
patent: 6580600 (2003-06-01), Toyoda et al.
patent: 2002/0114125 (2002-08-01), Toyoda et al.
patent: 2004/0008041 (2004-01-01), Davis et al.
patent: 2004/0008471 (2004-01-01), Davis et al.
patent: 2004/0182153 (2004-09-01), Hamamoto
Isogai Toshiki
Itakura Toshikazu
Christensen Ryan
Denso Corporation
Nippon Soken Inc.
Posz Law Group , PLC
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