Radiant electric heaters
US5171973A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 16, 1992 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Jan 16, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/742
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A radiant electric heater arrangement for connection to a power supply system providing first and second different power supply voltages, for example 120 volts and 240 volts, includes a heater having at least first and second heating elements, a rectifier and a switch coupled to the heating elements and to the rectifier. The switch is able to couple the heating elements and the rectifier in a number of different configurations including (a) coupling the heating elements selectively in series and in parallel with one another; (b) coupling the heating elements selectively to the first and second power supply voltages; and (c) coupling the rectifier selectively in series with at least one of the heating elements, thus providing a plurality of user selected power output levels of the heater. Where three or more heating elements are provided, at least one of the heating elements is preferably an infra-red lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.