Self-regulating heater having a heat tape that stops tracking
US4889975A · kind A · utility
3Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1988 |
| Grant date | Dec 26, 1989 |
| Priority date | — |
| Expiry date | Mar 16, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49083
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A phenomenon sometimes referred to as tracking can occur when the end of an electrical heater, made of two or more metal conductors and a conductive polymer web, comes into contact with water or other electrolytes which allow arcing to take place across the surface of the web. Tracking is stopped by holes in the web which prevent arcing from continuing up the length of the heat tape.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.