Self-limiting temperature electrical heating cable
US4117312A · kind A · utility
21Cited by
12References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1976 |
| Grant date | Sep 26, 1978 |
| Priority date | — |
| Expiry date | Jul 22, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical heating cable which limits power output once an established temperature limit is reached. The cable includes a high-resistance element and a temperature-sensitive variable resistance element electrically connected in series between two electrical conductors otherwise insulated from each other by insulating material. The temperature-sensitive resistance undergoes a substantial positive increase in resistivity when the temperature of the cable nears the established temperature limit. The increase in resistivity substantially reduces the heat-generating current flowing in the cable to limit the power output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.