Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Reexamination Certificate
2007-06-19
2007-06-19
Leja, Ronald W. (Department: 2836)
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
Reexamination Certificate
active
10886512
ABSTRACT:
A circuit for protecting a solenoid and/or receipt printer in an electronic device, such as a point-of-sale terminal, includes a resistance and a capacitance. The resistance is electrically coupled in parallel with the capacitance, and the parallel network of resistance and capacitance is coupled in series with the solenoid. An energizing signal is applied to the parallel network to energize the solenoid. A method of protecting a solenoid and/or receipt printer in the electronic device includes the steps of coupling a resistance electrically in parallel with a capacitance, coupling the parallel network electrically in series with the solenoid, and applying an energizing signal to the parallel network to energize the solenoid. The capacitance preferably includes two polarized electrolytic capacitors electrically coupled in a back-to-back series configuration with common polarities connected to each other.
REFERENCES:
patent: 3061185 (1962-10-01), Richard
patent: 3412395 (1968-11-01), Kiene, Jr.
patent: 3456164 (1969-07-01), Sternberg
patent: 3500416 (1970-03-01), Ellsworth
patent: 5111394 (1992-05-01), Hilles et al.
Hoffmann & Baron , LLP
Leja Ronald W.
Logic Controls, Inc.
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