Number | Name | Date | Kind |
---|---|---|---|
2535060 | Gresham | Dec 1950 | |
2549470 | Howk et al. | Apr 1951 | |
4086262 | Chang et al. | Apr 1978 | |
4171320 | Vannice et al. | Oct 1979 | |
4199522 | Marchison et al. | Apr 1980 | |
4206134 | Kugler et al. | Jun 1980 | |
4215019 | Drake et al. | Jul 1980 | |
4246186 | Bhosin | Jan 1981 |
Entry |
---|
Galvagno et al., J. of Cat., 69, 283-291, 1981. |