Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2008-07-29
2008-07-29
Sherry, Michael J (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
C324S418000, C324S422000, C324S423000, C324S546000
Reexamination Certificate
active
11455270
ABSTRACT:
The present invention provides a method and apparatus for determining the functional status of an electromagnetic valve having a solenoid and plunger including determining the electro-mechanical switching time of a valve based on characteristics of an electrical characteristic responsive to the solenoid; comparing the valve electro-mechanical switching time to a predetermined value; and generating a valve status signal dependant on the results of the comparison.
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Ahrens Oliver
Forster Karl-Heinz
Missal Wjatscheslaw
Szenn Otto
Festo AG & Co.
Hoffmann & Baron , LLP
Mai Tien
Sherry Michael J
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