Overvoltage protector for telephone lines
US4393433A · kind A · utility
6Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 16, 1981 |
| Grant date | Jul 12, 1983 |
| Priority date | — |
| Expiry date | Jul 16, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T4/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An overvoltage or surge protector, particularly for telephone lines, has two electrodes in opposition in a housing. The gap between the inner ends of the electrodes is set by a layer of dielectric material on the center portion of one or both end surfaces of the electrodes. Breakdown occurs with assistance from dielectric stimulation of the arc, resulting from an electrical field across the dielectric. The center portions are surrounded by annular grooves, which are also covered with a dielectric layer. The end surfaces external to the center portions can be convex, and also roughened.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.