| Number | Name | Date | Kind |
|---|---|---|---|
| D393672 | Clay | Apr 1998 | |
| 1482232 | Hazeltine | Jan 1924 | |
| 1795732 | Miller | Mar 1931 | |
| 2050402 | Walsh | Mar 1936 | |
| 2135210 | Farrar | Nov 1938 | |
| 2335405 | Geer | Nov 1943 | |
| 2861810 | Veatch | Nov 1958 | |
| 4266773 | Treadwell | May 1981 | |
| 5427378 | Murphy | Jun 1995 | |
| 5662534 | Kroll et al. | Sep 1997 |