| Number | Date | Country | Kind |
|---|---|---|---|
| 2009 3 0305383 | Jun 2009 | CN | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 6637502 | North et al. | Oct 2003 | B1 |
| 6735864 | Sato et al. | May 2004 | B2 |
| 6899164 | Li et al. | May 2005 | B1 |
| 7152666 | Chen et al. | Dec 2006 | B2 |
| D581376 | Shaner | Nov 2008 | S |
| 7509995 | Bhatti et al. | Mar 2009 | B2 |
| 20030070790 | Chen et al. | Apr 2003 | A1 |
| 20090139690 | Maerz et al. | Jun 2009 | A1 |