Electrical heating element
US4021769A · kind A · utility
6Cited by
1References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 1976 |
| Grant date | May 3, 1977 |
| Priority date | — |
| Expiry date | Mar 18, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C3/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An elongated electrical heating element comprises intertwisted helical strands of metal wire. Some of the strands extend the full length of the heating element and other strands extend predetermined shorter distances to provide two or more zones having differing electric resistances and therefore differing operating temperatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.