| Number | Name | Date | Kind |
|---|---|---|---|
| D220769 | LaHue | May 1971 | |
| 1482232 | Hazeltine | Jan 1924 | |
| 1795732 | Miller | Mar 1931 | |
| 2050402 | Walsh | Mar 1936 | |
| 2861810 | Veatch | Nov 1958 | |
| 3054615 | Budish | Sep 1962 | |
| 4284276 | Worst | Aug 1981 | |
| 4603862 | Chen | Aug 1986 | |
| 4664387 | Tardiff | May 1987 | |
| 4878674 | Newcomb et al. | Nov 1989 | |
| 5427378 | Murphy | Jun 1995 | |
| 5662534 | Kroll et al. | Sep 1997 |