Protective system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 15, 1981
Grant Date -
N/A
app pub date -
Jul 5, 1979
filing date -
Jul 5, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A domestic protective system which utilizes existing household AC power lines to conduct system signals between remote stations or zones and a master receiver. The system signals are established by a single carrier frequency and include a data pulse of this frequency under normal conditions, and no data pulse under malfunction conditions. Locations of zones originating system data signals are identified by time delays established prior to data transmission from each zone, this delay triggered and synchronized by data transmissions transmitted from other zones.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
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