| Number | Name | Date | Kind |
|---|---|---|---|
| 2973832 | Cook et al. | Mar 1961 | |
| 3190058 | Farr et al. | Jun 1965 | |
| 3226917 | Donovan et al. | Jan 1966 | |
| 3429108 | Larson | Feb 1969 | |
| 3535853 | Brown et al. | Oct 1970 | |
| 3811251 | Gibel | May 1974 | |
| 4203739 | Erdmannsdorfer | May 1980 | |
| 4516994 | Kocher | May 1985 | |
| 4632682 | Erdmannsdorfer | Dec 1986 | |
| 4720292 | Engel et al. | Jan 1988 | |
| 4735640 | Thornburgh et al. | Apr 1988 | |
| 4759783 | Machado | Jul 1988 | |
| 4764191 | Morelli | Aug 1988 | |
| 4848989 | Maeda | Jul 1989 | |
| 5006235 | Cooper | Apr 1991 | |
| 5238474 | Kahlbaugh et al. | Aug 1993 | |
| 5547480 | Coulonvaux | Aug 1996 | |
| 5613992 | Engel | Mar 1997 | |
| 5690712 | Engel | Nov 1997 | |
| B14720292 | Engel et al. | Sep 1991 | |
| B24720292 | Engel et al. | Feb 1994 |