Thermostat with energy saving backlit switch actuators and visual display
US7299996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2004 |
| Grant date | Nov 27, 2007 |
| Priority date | — |
| Expiry date | Apr 25, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D23/1905
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An air conditioning system thermostat includes a visual display and plural switch actuators, respectively backlit by an electroluminescent lamp and LED light sources mounted on a circuit board disposed in a thermostat housing. A control circuit causes at least one switch actuator to be illuminated continuously and the light sources for the display and the remaining switch actuators are illuminated in response to actuation of any one of the switch actuators. Switch contact elements mounted on the switch actuators and the circuit board provide advantageous positioning of the LED light sources for the switch actuators. An energy savings switch actuator allows the control circuit to directly assume setback temperature settings in response to a first actuation and a second actuation resets the thermostat to the initial user set temperature settings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.