| Number | Name | Date | Kind |
|---|---|---|---|
| D318269 | Hassel et al. | Jul 1991 | |
| 4519013 | Breeze et al. | May 1985 | |
| 4707764 | Cogan | Nov 1987 | |
| 4858070 | Buron et al. | Aug 1989 | |
| 4866215 | Muller et al. | Sep 1989 | |
| 4926009 | Van Leeuwen | May 1990 | |
| 5031074 | Ravid | Jul 1991 | |
| 5142445 | Sorensen et al. | Aug 1992 | |
| 5172303 | Bernardoni et al. | Dec 1992 |