Foil element
US4797537A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1986 |
| Grant date | Jan 10, 1989 |
| Priority date | — |
| Expiry date | Dec 10, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/017
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A foil element for the electric heating of objects comprises a resistance heating coil placed between insulating plastic foils and a sensor coil placed between the plastic foils beside the heating coil. The sensor and heating coils are formed of the same metallic material. The sensor coil is spaced sufficiently far from the heating coil to assure that the sensor coil is heated mainly by heat flowing to or from the object being heated and only slightly by heat directly from the heating coil. The electric resistance of the sensor coil is sensed to determine the temperature thereof. The heating coil is controlled in accordance with the temperature of the sensor coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.