Device control system
US4266097A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | May 14, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F11/61
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
The disclosed energy control system employs the serving electronic stored program PBX to regulate the operation of energy consuming devices located throughout a hotel/motel or office building in accordance with one or more modes of operation as offered by an algorithm stored in the PBX memory. This is accomplished by equipping each guest room or office with a control circuit to regulate the operation of the energy consuming devices located in that room. These control circuits are activated by the presence of an audio frequency tone on the telephone line associated with the room. To minimize the impact of this scheme on the traffic capacity of the PBX time division switching network, all activated control circuits are concurrently connected to a single time slot, which supplies the required audio frequency tone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.