| Number | Name | Date | Kind |
|---|---|---|---|
| D289342 | Reichow | Apr 1987 | |
| D298287 | Stravitz | Nov 1988 | |
| D303330 | Stanton | Sep 1989 | |
| D307977 | Egly et al. | May 1990 | |
| D320707 | Garfinkle | Oct 1991 | |
| D321279 | Mark | Nov 1991 | |
| D326357 | Chow | May 1992 | |
| D326378 | Yunger et al. | May 1992 | |
| 3710900 | Fink | Jan 1973 | |
| 4889244 | Hean et al. | Dec 1989 |