Flat heating element
US7714256B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 15, 2007 |
| Grant date | May 11, 2010 |
| Priority date | — |
| Expiry date | Feb 9, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/033
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a heating element for heating at least one surface contacted at times by a user, with a plurality of heating conductors or heating conductor sections that are directly or indirectly connected electrically to one another, at least in part by mutual contact, with at least one heating conductor or heating conductor section which, upon exceeding a permissible maximum temperature, at least temporarily loses its electrical conductivity at least in part. It is provided that the electrical resistance of at least two heating conductors or heating conductor sections is dependent at least in part on its mechanical strain, that these heating conductors or heating conductor sections are electrically connected to one another in parallel, and that they are separated from one another at least in sections by a spacing zone in order to prevent electrical connection between them in spacing zone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.