Communications: electrical – Systems – Selsyn type
Patent
1989-04-17
1993-03-23
Crosland, Donnie L.
Communications: electrical
Systems
Selsyn type
340310A, 340310CP, 340573, 119156, 43124, 43143, H04M 1104, A01M 504
Patent
active
051968231
ABSTRACT:
A deratization system includes a plurality of remote terminals provided with vibrating apparatus, the remote terminals being controlled by a central transmitting unit. High frequency signals generated by the central transmitting unit are sent through the existing electrical net of a building to the remote terminals using the technique of simultaneously conveyed frequencies. A signal energizes all terminals or just a number of preselected terminals. In turn the remote terminals are sending in case of malfunction an error signal to the central transmitting unit.
REFERENCES:
patent: 3657715 (1972-04-01), Curtia
patent: 4040046 (1977-08-01), Long et al.
patent: 4365238 (1982-12-01), Kollin
patent: 4410883 (1983-10-01), Swiston, Sr.
patent: 4446458 (1984-05-01), Cook
Crosland Donnie L.
Josif Albert
Modiano Guido
Multitecno S.p.A.
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