Measuring and testing – Liquid level or depth gauge – Immersible electrode type
Reexamination Certificate
2008-04-22
2008-04-22
Williams, Hezron (Department: 2856)
Measuring and testing
Liquid level or depth gauge
Immersible electrode type
C073S30400R
Reexamination Certificate
active
07360418
ABSTRACT:
A liquid level sensing arrangement using a probe uses a baseline probe circuit characteristic, e.g., a circuit resistance or voltage, that is measured when the probe is out of contact with the liquid in the tank. The baseline characteristic may be used to determine a liquid level in the tank, e.g., a determination whether the liquid level is below or at/above the probe. In one embodiment, the baseline characteristic may be compared to a circuit characteristic that is measured as the tank is being filled. A difference between the baseline characteristic and the other circuit characteristic may be used to determine whether or not the probe is in contact with the liquid.
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International Search Report and Written Opinion mailed Dec. 5, 2006 for International Application No. PCT/US2006/024737.
Keurig Incorporated
West Paul M
Williams Hezron
Wolf Greenfield & Sacks P.C.
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