Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2011-08-16
2011-08-16
Natalini, Jeff (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S686000
Reexamination Certificate
active
07999562
ABSTRACT:
An operator detection and presence device includes a conductive sensor and a guard electrode. The sensor and electrode are physically located and electrically connected in a manner which helps the detection circuit measure if an operator's hand is on the handle or if the change in capacitance is due to water. The sensor and electrode are preferably physically located in the handle spaced apart from one another, where the sensor is located in an area that the operator will touch. The electrode is located in an area that the operator will not generally touch. A detection circuit is connected to the sensor and electrode for measuring whether the capacitance of the sensor has changed. The electrode is used to avoid false detections and/or the ability to detect of operator presence.
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Kelpe Hans
Khapochkin Yuriy
Merchant & Gould P.C.
Natalini Jeff
Vermeer Manufacturing Company
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