Electrical devices comprising cross-linked conductive polymers
US4857880A · kind A · utility
48Cited by
10References
20Claims
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Assignee
Inventors
Key dates
| Filing date | Feb 8, 1988 |
| Grant date | Aug 15, 1989 |
| Priority date | — |
| Expiry date | Feb 8, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B3/146
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electrical devices containing PTC conductive polymers which have been cross-linked in two steps, preferably by radiation. The conductive polymer is heat-treated above the temperature at which it begins to melt between the two cross-linking steps, and/or the cross-linking steps are such that a center section of the conductive polymer, intermediate the electrodes, is substantially more cross-linked than the conductive polymer adjacent the electrodes. The process is particularly useful for the preparation of circuit protection devices which are subject to high voltage faults.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.