| Number | Name | Date | Kind |
|---|---|---|---|
| D303558 | Alessandri | Sep 1989 | |
| D342106 | Campbell et al. | Dec 1993 | |
| D347251 | Dreibelbis et al. | May 1994 | |
| 4902007 | Ferrari | Feb 1990 | |
| 5232426 | Van Straaten | Aug 1993 | |
| 5330405 | Habing et al. | Jul 1994 | |
| 5346447 | Stearns | Sep 1994 | |
| 5362296 | Wang et al. | Nov 1994 | |
| 5387171 | Casey et al. | Feb 1995 |