Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-04-05
1991-03-05
Swann, III, Glen R.
Communications: electrical
Condition responsive indicating system
Specific condition
340521, G08B 1314
Patent
active
049980947
ABSTRACT:
A safeguard device is provided with a high frequency sensor which triggers an alarm device after receiving high frequency energy. To prevent the alarm device being rendered ineffective by high frequency shielding of the safeguard device, a metal sensor is provided in addition which activates the alarm device regardless of the presence of high frequency energy when it is attempted to shield the safeguard device.
REFERENCES:
patent: 4167004 (1979-09-01), Schenck et al.
patent: 4401976 (1983-08-01), Stadelmayr
patent: 4471344 (1984-09-01), Williams
patent: 4700179 (1987-10-01), Fancher
Englmeier Martin
Enkelmann Thomas F.
Moolji Salim
Weber Hans-Werner
Mullen Jr. Thomas J.
Swann III Glen R.
Telefunken electronic GmbH
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