Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1991-01-24
1991-09-17
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
109 42, G08B 1300
Patent
active
050498541
ABSTRACT:
A sensing element (18) for use in an alarm system for protecting an area enclosed by flexible closure device (10). The element includes a plurality of conductors (16), at least one of which is a decoy conductor intended to prevent circumvention of the alarm system by short-circuiting or the like. The decoy conductor can be a dummy conductor carrying no current, or can be connected into an alarm circuit arranged to sense attempts to connect the decoy conductor to another conductor.
REFERENCES:
patent: 3051935 (1962-08-01), Willson
patent: 4146293 (1979-03-01), Mutton et al.
patent: 4521767 (1985-06-01), Bridge
Mullen Jr. Thomas J.
Swann III Glen R.
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