Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-01-21
1995-07-18
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340644, 340687, 34031008, 200 511, G08B 1326
Patent
active
054345588
ABSTRACT:
An annunciator for indicating the removal of an electrical plug from the electrical receptacle. The electrical receptacle includes neutral switching contacts actuated in response to the insertion of a plug into the receptacle. An input circuit in the annunciator apparatus monitors the state of the neutral switching contacts and couples signals produced when a plug is removed to a latching circuit thereby to produce an audible or electrical indication of plug removal. The input Circuit and latching circuit are electrically isolated, and the annunciator detects any attempts to disconnect the apparatus from an external power supply or to remove any internal battery.
REFERENCES:
patent: 2660663 (1953-11-01), Rahmel
patent: 5243328 (1993-09-01), Lee et al.
patent: 5258744 (1993-11-01), Zeder
Peng John K.
Pope Daryl C.
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