Multilayer zinc oxide varistor
US7541910B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 2006 |
| Grant date | Jun 2, 2009 |
| Priority date | — |
| Expiry date | Mar 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01C7/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A multilayer zinc oxide varistor without bismuth oxide system ingredients, and having variable breakdown voltages by controlling the thickness of the ceramic material; the varistor is bismuth-free and composed of zinc oxide as the primary constituent with alkaline earth element (Ba) as first additive, at least one of transition elements of Mn, Co, Cr, or Ni as second additives, at least one of rare earth elements of Pr, La, Ce, Nd or Tb as third additives and at least one of B, Si, Se, Al, Ti, W, Sn, Sb, Na, or K as rest additives, and the bismuth-free and zinc oxide based varistor exhibits an excellent ESD (Electro-Static Discharge) withstanding characteristic.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.