Electrical devices comprising conductive polymer compositions
US4304987A · kind A · utility
416Cited by
5References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 14, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Sep 14, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/027
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electrical devices which comprise a PTC element composed of a PTC conductive polymer composition and a contiguous CW element composed of a conductive polymer composition which comprises an organic thermoplastic polymer and a conductive carbon black having a particle size (D) in millimicrons and surface area (S) in m.sup.2 /g such that S/D is at least 10. D is preferably less than 27 millimicrons, especially less than 18 millimicrons. S/D is preferably at least 12, especially at least 18. Particularly useful devices are in the form of heaters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.