Alarm system

Details Alarm system Alarm system

1978-08-11

1983-10-18

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340508, 340523, 340556, 340691, G08B 1304, G08B 2500, G08B 2600, G08B 2900

Patent

active

044108842

ABSTRACT:
An Alarm system for furnishing an alarm signal in response to unauthorized entry through a passage connecting the outside to the interior of a building, wherein a first detecting device furnishes a first output signal when sensing the presence of a person in a first portion of the passage. A second detecting device nearer the outside of the building furnishes a second output signal when sensing the approach of a person. An evaluating circuit receives the output signals and initiates an alarm signal only if the second output signal is furnished prior to the first output signal.

REFERENCES:
patent: 2455780 (1948-12-01), Kohout
patent: 2695994 (1954-11-01), Lode
patent: 3789384 (1974-01-01), Akers
patent: 3825916 (1974-07-01), Steele et al.
patent: 3859647 (1975-01-01), Ross
patent: 3991415 (1976-11-01), Baar, Sr.
patent: 4087814 (1978-05-01), Spirig
patent: 4131887 (1978-12-01), Birkenhead
patent: 4142187 (1979-02-01), Nakayama
Sueddeutsche Zeitung, No. 164, Dated Jun. 19, 1973, Entitled "Mankind and Technology".
Publication Entitled Elektronic, 1970, Issue 2, p. 60.

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