Telephonic communications – Telephone line or system combined with diverse electrical... – Remote control
Patent
1993-11-08
1995-01-31
Chan, Wing F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Remote control
379105, H04M 1100
Patent
active
053864611
ABSTRACT:
A unit for providing heating, ventilation, and/or air conditioning (HVAC, 15) is controlled by one or another thermostat (17a, 17b) in response to a switch (21) the setting of which is controlled by dual tone multiple frequency signals sent from a regular telephone (26) over ordinary phone lines (27). The functions of ring detection and answering a call (28) as well as tone detection (30) may be provided by selected modules (34-38) or by an answering machine (83). A switch used to select one of the thermostats may comprise a stepping relay (21a) a bistable toggle relay (21b), or a bistable relay 21c. The phone control switch apparatus may selectively apply power to an outlet (91) for running a self-contained HVAC such as an air conditioner (94) or a heater (95).
REFERENCES:
patent: 4021615 (1977-05-01), James et al.
patent: 4121053 (1978-10-01), Dick
patent: 4174064 (1979-11-01), Pratt, Jr.
patent: 4266097 (1981-05-01), Cannon et al.
patent: 4353502 (1982-10-01), Myers
patent: 4418244 (1983-11-01), Edgar
patent: 4885766 (1989-12-01), Yasuoka et al.
Chan Wing F.
Williams M. P.
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