Switch controlled, zone-type heating cable and method
US5512732A · kind A · utility
286Cited by
22References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 7, 1993 |
| Grant date | Apr 30, 1996 |
| Priority date | — |
| Expiry date | Jan 7, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A parallel, zone-type heating cable wherein thermally-controlled ferrite reed switches in each zone regulate current flow to heating elements aligned in parallel with each other. Two parallel conductors deliver current to the switches and the heating elements. A dielectric insulation material separates the conductors from each other and the heating elements. The heating cable may further include a component having a particular temperature coefficient of resistance aligned in parallel with the switch to further regulate current flow to a positive but lesser level when the switch is open.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.