Solid state telephone protector module
US4944003A · kind A · utility
21Cited by
2References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1989 |
| Grant date | Jul 24, 1990 |
| Priority date | — |
| Expiry date | Sep 28, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01T4/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An individual subscriber circuit protector module employing solid state circuitry for protection against momentary voltage surges, and having firmly sensitive heat coil assemblies for protecting against continuous excess current surges. Fail-safe protection is also provided which becomes operative in the event of failure of the heat coil protection.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.