Planar heating element
US4074222A · kind A · utility
Inventors
Key dates
| Filing date | Aug 1, 1975 |
| Grant date | Feb 14, 1978 |
| Priority date | — |
| Expiry date | Aug 1, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/565
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A planar heating element having a thin flat body formed from an insulating thermoplastic resin and electrically conductive powder. The electrically conductive powder is formed in a layer within the thermoplastic resin in the neighborhood of the entire surface of the body. Lead wires within the flat body being positioned near the surface of the body such that the lead wires are electrically connected to said layer of electrically conductive powder. The planar heating element being produced by a method comprising melt-admixing an insulating thermoplastic resin with an electrically conductive powder. The mixture is then extruded, and the extruded body is rapidly cooled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.