| Number | Date | Country | Kind |
|---|---|---|---|
| 807872501 | Apr 2014 | WO | international |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4051787 | Nishitani | Oct 1977 | A |
| 5579686 | Pigott | Dec 1996 | A |
| 5676064 | Shuert | Oct 1997 | A |
| 6006677 | Apps | Dec 1999 | A |
| 6250234 | Apps | Jun 2001 | B1 |
| 6955128 | Apps | Oct 2005 | B2 |
| 8950342 | Plattner | Feb 2015 | B2 |
| 20030110990 | Apps | Jun 2003 | A1 |
| 20080017081 | Baltz | Jan 2008 | A1 |
| 20080053342 | Muirhead | Mar 2008 | A1 |
| 20080236455 | Naidu | Oct 2008 | A1 |
| 20090000527 | Ficker | Jan 2009 | A1 |