Electricity: electrical systems and devices – Safety and protection of systems and devices – Impedance insertion
Reexamination Certificate
2005-08-09
2005-08-09
Leja, Ronald (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Impedance insertion
C361S093900
Reexamination Certificate
active
06927958
ABSTRACT:
Active transient suppression apparatus coupleable in series with an electrical pathway into a potentially explosive environment for limiting current, voltage and energy thereto comprises: an impedance element coupleable in series with the electrical pathway; a protection circuit comprising: at least one semiconductor element including a current conduction channel in series with the impedance element in the electrical pathway; and a driver circuit operative in response to a drive signal to switch the at least one semiconductor element to a non-conducting state; and a sense circuit coupled to the impedance element for sensing current conducted therethrough and generating a signal proportionally representative of the sensed current, the generated signal becoming the drive signal as it reaches a threshold level. The active transient suppression apparatus may be embodied in a system for determining a quantity of fuel in a container. The system comprises: at least one sensor disposed at the container; sensor excitation system coupled to each of the at least one sensor through an electrical pathway for providing an excitation signal thereto; and the active transient suppression apparatus disposed in series with each electrical pathway.
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Calfee Halter & Griswold LLP
Leja Ronald
Percio David R.
Simmonds Precision Products Inc.
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