| Country | Patent Number | |
| United States | 6528803 | |
| United States | 6675116 | |
| United States | 6934358 | |
| United States | 6934653 | |
| United States | 6937751 | |
| United States | 7013228 | |
| United States | 7016464 | |
| United States | 7024026 | |
| United States | 7233688 | |
| United States | 7327902 | |
| Germany | 1252550 | |
| European | 1252550 | |
| European | 1318857 | |
| European | 1683546 | |
| Canadian | 2418232 | |
| Spain | 1252550 | |
| France | 1252550 | |
| United Kingdom | 1252550 | |
| Ireland | 1252550 | |
| Italy | 1252550 | |
| Netherlands | 1252550 | |
| Sweden | 1252550 | |
| Japan | 3817176 | |
| Japan | 4366362 | |