Telephone line surge protector module with fast-acting, high resistance heat coil assembly
US5646812A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Aug 28, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49096
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A telephone line surge protector module with fast-acting, high resistance heat coil assembly includes a plurality of turns of resistive heating wire having a conductive core, a heat-resisting insulative coating, and a relatively high tensile-strength serving for resisting manufacturing stresses. The serving permits a number of turns of the wire to be tightly wound about a bobbin, without being damaged due to stresses encountered in the manufacturing process. The heat resisting insulative coating prevents shorting between the turns at high temperatures, yet is thin enough so that inter-turn thermal conductance is not degraded. The serving is preferably formed of a material that softens or liquifies at high temperatures to enhance inter-turn thermal conductance. The module with fast-acting coil is suitable for protecting sensitive electronic digital switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.