Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1979-07-05
1981-09-15
Waring, Alvin H.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340310R, 340524, G08B 2500
Patent
active
042900565
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.
REFERENCES:
patent: 3148365 (1964-09-01), Voight et al.
patent: 3334340 (1967-08-01), McConnell
patent: 3388389 (1968-06-01), Henriques
patent: 3460121 (1969-08-01), Wattenburg
patent: 3482243 (1969-12-01), Buchsbaum
patent: 3641547 (1972-02-01), Reiss et al.
patent: 3686439 (1972-08-01), Gerald
patent: 3689886 (1972-09-01), Durkee
patent: 3810096 (1974-05-01), Kabat et al.
patent: 3818466 (1974-06-01), Honda
patent: 3922664 (1975-11-01), Wadsworth
patent: 3961322 (1976-06-01), Lichtblau
patent: 3974492 (1976-08-01), Girismen
patent: 4024528 (1977-05-01), Boggs et al.
Ellsworth, Chow & Murphy, Inc.
Waring Alvin H.
LandOfFree
Protective system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Protective system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Protective system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-393121