Alumina ceramic
US8198204B2 · kind B2 · utility
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Key dates
| Filing date | Jun 22, 2009 |
| Grant date | Jun 12, 2012 |
| Priority date | — |
| Expiry date | Sep 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/856
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An alumina ceramic contains a Ba0.808Al1.71Si2.29O8 phase. The alumina ceramic has high reflectivity and is useful as a reflecting material for a light emitting element. The alumina ceramic which exhibits an X-ray diffraction pattern having a ratio of the peak intensity at 2θ=43.3° to that at 22.5° of 0.5 to 2.5 has particularly high reflectivity. The alumina ceramic shows high reflectivity particularly at wavelengths ranging from 300 to 400 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.