| Number | Name | Date | Kind |
|---|---|---|---|
| 477122 | Johnson | Jun 1892 | A |
| 503236 | Guthrie et al. | Aug 1893 | A |
| 514748 | Decker | Feb 1894 | A |
| 3558187 | Morse | Jan 1971 | A |
| 5775710 | Yu | Jul 1998 | A |
| 6007148 | Yu | Dec 1999 | A |
| 6343836 | Yu | Feb 2002 | B1 |
| 6860551 | Chi | Mar 2005 | B1 |
| 7059673 | Lee | Jun 2006 | B1 |
| 7093894 | Yu | Aug 2006 | B2 |
| 7431390 | Martin et al. | Oct 2008 | B2 |