| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-029928 | Nov 2006 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 5892996 | Yokota | Apr 1999 | A |
| 6422767 | Shiono et al. | Jul 2002 | B1 |
| D500777 | Basmadjian et al. | Jan 2005 | S |
| D508711 | Suzuki | Aug 2005 | S |
| D532434 | Horikiri | Nov 2006 | S |
| D538322 | Horikiri | Mar 2007 | S |
| D541834 | Horikiri et al. | May 2007 | S |
| D556806 | Horikiri et al. | Dec 2007 | S |