Electric resistance heater
US4401883A · kind A · utility
5Cited by
9References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Aug 14, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A horizontal porcupine coil of electric resistance heating wire is supported against sagging by two superimposed coil-center ceramic tubes containing a conductor for one end of the coil. If one tube cracks it is improbable that the other would crack in the same place, and this keeps to a minimum the possibility of short-circuiting between the conductor and coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.