Patent Grant
D246794
| Number | Name | Date | Kind |
|---|---|---|---|
| D52762 | Swenson | Dec 1918 | |
| D186889 | Atalla et al. | Dec 1959 | |
| D187272 | Twist | Feb 1960 | |
| D193242 | Twist | May 1964 | |
| D193643 | Klonoski et al. | Sep 1962 | |
| D225853 | Hecht | Jan 1973 | |
| D228913 | Fulton | Oct 1973 | |
| D232362 | Bonifant | Aug 1974 | |
| D234517 | Bonifant | Mar 1975 | |
| D235021 | Fulton | Apr 1975 | |
| D237972 | Bonifant | Dec 1975 | |
| 1241166 | Swenson | Sep 1917 | |
| 1404298 | Jacobs | Jan 1922 | |
| 1815529 | Shurtleff | Jul 1931 | |
| 2032224 | Paton | Feb 1936 | |
| 2148555 | Hicks | Feb 1939 | |
| 3406760 | Weir | Oct 1968 | |
| 3733147 | Folker | May 1973 | |
| 3759630 | Freeman et al. | Sep 1973 | |
| 3914069 | Arrington et al. | Oct 1975 |
