| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-031170 | Nov 2006 | JP | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 3726276 | Schumann et al. | Apr 1973 | A |
| D263746 | Johnson et al. | Apr 1982 | S |
| 4362158 | Lena | Dec 1982 | A |
| 4596573 | Donnan et al. | Jun 1986 | A |
| D297306 | King | Aug 1988 | S |
| 4805767 | Newman | Feb 1989 | A |
| D306759 | D'Alo | Mar 1990 | S |
| D331460 | Mulder | Dec 1992 | S |
| 5200200 | Veech | Apr 1993 | A |
| D400246 | Niedospial et al. | Oct 1998 | S |
| D407816 | Barney et al. | Apr 1999 | S |
| D451542 | Ishizawa et al. | Dec 2001 | S |
| 6682517 | Ezaki et al. | Jan 2004 | B1 |