Number | Name | Date | Kind |
---|---|---|---|
D192866 | Crenshaw | May 1962 | |
D194834 | Parker et al. | Mar 1963 | |
D227650 | Sneddon | Jul 1973 | |
D277729 | Maxwell | Feb 1985 | |
D282713 | Flory et al. | Feb 1986 | |
3052970 | Perrin | Sep 1962 | |
3913423 | Gerst | Oct 1975 | |
3972104 | Partin et al. | Aug 1976 | |
4561271 | Scharboneau | Dec 1985 |