Elevator – industrial lift truck – or stationary lift for vehicle – Having computer control of elevator – Includes redundant circuitry
Reexamination Certificate
2004-04-27
2009-06-23
Salata, Jonathan (Department: 2837)
Elevator, industrial lift truck, or stationary lift for vehicle
Having computer control of elevator
Includes redundant circuitry
C187S391000
Reexamination Certificate
active
07549513
ABSTRACT:
In an elevator control apparatus, calculations regarding the control of an elevator are performed in a duplexed system including first and second processing portions. A first clock signal from a first clock is input to the first processing portion. A second clock signal from a second clock is input to the second processing portion. The first and second clock signals are input to a clock abnormality detecting circuit. The clock abnormality detecting circuit counts the numbers of pulses of the first and second clock signals, and detects abnormalities in the first and second clock signals from a difference between the numbers of the pulses.
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Mitsubishi Denki & Kabushiki Kaisha
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Salata Jonathan
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