| Number | Name | Date | Kind |
|---|---|---|---|
| D266509 | Marshall | Oct 1982 | |
| D285203 | Milroy et al. | Aug 1986 | |
| D309298 | Pushelberg | Jul 1990 | |
| D317609 | Wei | Jun 1991 | |
| D318654 | Huang | Jul 1991 | |
| D319439 | Danielson et al. | Aug 1991 | |
| D337757 | Wu | Jul 1993 | |
| D340059 | Wetzel et al. | Oct 1993 | |
| D346606 | Harris et al. | May 1994 | |
| D350747 | McClendon | Sep 1994 |