The stippling in the design indicates contrast and does not indicate color.
The stippling in the design indicates contrast and does not indicate color.
| Number | Name | Date | Kind |
|---|---|---|---|
| 5896897 | Lewis et al. | Apr 1999 | A |
| 6223435 | Stavrakis | May 2001 | B1 |
| 6244309 | Martin | Jun 2001 | B1 |
| 20060042715 | Stavrakis et al. | Mar 2006 | A1 |