| Number | Date | Country | Kind |
|---|---|---|---|
| 000649751 | Dec 2006 | EM | regional |
| Number | Name | Date | Kind |
|---|---|---|---|
| 7299666 | Geyer et al. | Nov 2007 | B2 |
| 7316133 | No et al. | Jan 2008 | B2 |
| 7325423 | No et al. | Feb 2008 | B2 |
| 7363781 | Erickson | Apr 2008 | B2 |
| 20040244435 | Kim | Dec 2004 | A1 |
| 20050138974 | Ha et al. | Jun 2005 | A1 |
| 20050262887 | Kim et al. | Dec 2005 | A1 |
| 20060112498 | Roh et al. | Jun 2006 | A1 |
| 20060117809 | Ha et al. | Jun 2006 | A1 |
| 20060117813 | Ha et al. | Jun 2006 | A1 |
| 20070017258 | Son et al. | Jan 2007 | A1 |
| 20070044521 | Choi et al. | Mar 2007 | A1 |
| 20070209411 | Lim et al. | Sep 2007 | A1 |