Intrusion alarm system with automatic exit control and misset in

Details Intrusion alarm system with automatic exit control and misset in Intrusion alarm system with automatic exit control and misset in

1985-05-22

1987-07-28

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340501, 340528, G08B 1308

Patent

active

046834605

ABSTRACT:
An intrusion alarm system with an automatic exit control and a misset indicator which informs that someone has trespassed by opening a door during the resident's absence. This system comprises a sequential circuit which is enabled by mode selection by the resident at his/her going out and which stores the door's opening and closing signal produced as an output signal of a door open/closed detection circuit upon a second door opening, a misset alarm device which generates an alarm if the opening of the door is not detected within a predetermined time after the "Absent" mode is placed, and a timer circuit which is operated by the output signal of the sequential circuit and at the time-up to generate alarms. The sequential circuit can be cleared or disabled when the resident comes home and generation of an alarm is then prevented.

REFERENCES:
patent: 3449738 (1969-06-01), Chesnul et al.
patent: 3803576 (1974-04-01), Dobrzanski et al.
patent: 4150369 (1979-04-01), Gaspari et al.
patent: 4543568 (1985-09-01), Hwang

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