Radiant heater
US4794233A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 18, 1987 |
| Grant date | Dec 27, 1988 |
| Priority date | — |
| Expiry date | Sep 18, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/748
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A radiant heater has a shallow shell-like support for carrying heating resistors and a glass ceramic top plate. A connection and hot warning indicating device is arranged in the space between the top plate and the support. The light source is preferably a low voltage tungsten halogen lamp which projects, at most, slightly beyond the front side of the support. Despite a very compact construction, the radiant heater is not subject to dazzle effects even over a large area, and a readily visible indicating illumination is obtained. The light source can be operated at different brightness levels, for example one brightness level indicating the switched-on condition of the heating resistor and the other brightness level indicating the hot-to-touch condition of the top plate, notwithstanding the switched-on or switched-off condition of the heating resistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.