Communications: electrical – Selective – Having indication or alarm
Patent
1974-07-03
1976-07-06
Caldwell, John W.
Communications: electrical
Selective
Having indication or alarm
307 10AT, 340274R, B60R 2510, G08B 1900
Patent
active
039684741
ABSTRACT:
An alarm system indicates unauthorized use or entry of a facility having an access arrangement and a source of electric potential. The alarm system comprises an alarm device and a first sensing circuit coupled in series with the alarm device and the potential source. The first sensing circuit is sensitive to breaking or entering or other unauthorized use of the access arrangement. A delay circuit is coupled in series with the alarm device and the potential source. The delay circuit normally completes a circuit path therethrough between the alarm device and the potential source but is effective when triggered to interrupt this circuit path for a predetermined interval sufficient to permit authorized entry or use of the access arrangement. A second sensing circuit is provided for triggering the delay circuit and for establishing an alternate circuit path between the alarm device and the potential source in bypassing relation to the first circuit so that the alarm device is activated at the end of the predetermined interval.
REFERENCES:
patent: 2984820 (1961-05-01), Kennell
patent: 3634846 (1972-01-01), Fogiel
patent: 3643214 (1972-02-01), Chan
patent: 3649962 (1972-03-01), Bedard et al.
patent: 3748494 (1973-07-01), Nine
Caldwell John W.
Nowicki Joseph E.
Smith Donn J.
LandOfFree
Alarm system having delay characteristic does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Alarm system having delay characteristic, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm system having delay characteristic will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1537073