Electricity: motive power systems – Automatic and/or with time-delay means – Moisture content or wetness
Reexamination Certificate
2007-01-24
2008-09-23
Ip, Paul (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Moisture content or wetness
C318S442000, C318S443000, C318S444000, C307S118000, C324S687000, C073S30400R, C073S30400R
Reexamination Certificate
active
07427844
ABSTRACT:
A pump assembly for pumping a liquid and a method of controlling the pump assembly. The pump assembly includes a motor coupled to a pump, and an electronic switch assembly electrically connected to the motor to control the current through the motor. The electronic switch assembly includes an electronic switch, a generator that provides a substantially periodic pulsing signal, a circuit control configured to provide a second signal, and decision logic connected to the generator, the circuit control, and the electronic switch. The decision logic receives the periodic pulsing and second signals and generates a control signal that selectively controls the electronic switch based on the periodic pulsing and second signals.
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A. O. Smith Corporation
Ip Paul
Michael & Best & Friedrich LLP
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