| Number | Name | Date | Kind |
|---|---|---|---|
| D270089 | Veelka | Aug 1983 | |
| D290656 | Kaleskas | Jun 1987 | |
| D305150 | Pastrone | Dec 1989 | |
| D331799 | Kramer et al. | Dec 1992 | |
| D336956 | Jen | Jun 1993 | |
| 4713051 | Steppe et al. | Dec 1987 | |
| 4798580 | DeMeo et al. | Jan 1989 | |
| 4821558 | Pastrone et al. | Apr 1989 | |
| 4842584 | Pastrone et al. | Jun 1989 | |
| 4927411 | Pastrone et al. | May 1990 |