Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Reexamination Certificate
2006-09-19
2006-09-19
Epps, Georgia (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
C250S227110, C356S627000
Reexamination Certificate
active
07109512
ABSTRACT:
An optical transducer for determining the presence or absence of liquid or the like in a reservoir includes an electrical circuit with a pulse generator and processing electronics to filter out ambient light and compensate for temperature changes. A comparator circuit portion includes a pair of comparators that simultaneously output high and low signals when in the presence of liquid. One of the outputs can be selected to drive an indicator, pump, relay or the like.
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Epps Georgia
Lee Patrick J.
Opti Sensor Systems, LLC
Wirthlin Alvin R.
LandOfFree
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