Electric heating device having a metal sheath
US4862137A · kind A · utility
3Cited by
4References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 26, 1987 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Jun 26, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A resistance heating device having a longitudinal axis and a substantially cylindrical graphite heating element with a connecting part for connection to an electric power source. The device has a sheath surrounding the graphite heating element, radially spaced therefrom and defining a gas tight chamber about the graphite heating element, the sheath being made from a refractory alloy sheet having angularly distributed longitudinal corrugations and an internal surface arranged to directly receive over its whole area radiation emitted by the graphite heating element when energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.