Number | Name | Date | Kind |
---|---|---|---|
2514825 | Zenko | Jul 1950 | |
2598489 | Bayer et al. | May 1952 | |
2738983 | Essig | Mar 1956 | |
3052323 | Hopfeld | Sep 1962 | |
3763965 | Reikkinen | Oct 1973 | |
3788659 | Allen | Jan 1974 | |
3907138 | Rhodes | Sep 1975 | |
4244595 | Sagaert | Jan 1981 | |
4737065 | Ju | Apr 1988 | |
4896897 | Wilhelm | Jan 1990 | |
4953888 | Stein | Sep 1990 | |
4974871 | Mao | Dec 1990 | |
5024458 | Kazmark et al. | Jun 1991 | |
5168601 | Liu | Dec 1992 |
Number | Date | Country |
---|---|---|
141575 | Jun 1951 | AUX |