| Number | Name | Date | Kind |
|---|---|---|---|
| D346862 | Koros et al. | May 1994 | |
| 3254649 | Wood | Jun 1966 | |
| 3302648 | Nelson | Feb 1967 | |
| 3367337 | Javna et al. | Feb 1968 | |
| 4165745 | Heiletz | Aug 1979 | |
| 5002554 | Korber | Mar 1991 | |
| 5147368 | Brown | Sep 1992 | |
| 5269790 | Funatsu | Dec 1993 | |
| 5282817 | Hoogeboom et al. | Feb 1994 |