Number | Name | Date | Kind |
---|---|---|---|
2413871 | Hepp | Jan 1947 | |
2481300 | Engel | Sep 1949 | |
2959538 | Weikart et al. | Nov 1960 | |
3063936 | Pearce et al. | Nov 1962 | |
3278266 | Welch et al. | Oct 1966 | |
3305587 | Sperbert et al. | Feb 1967 | |
3441370 | Gutmann et al. | Apr 1969 |
Number | Date | Country |
---|---|---|
1,266,908 | Jun 1968 | DT |
Entry |
---|
Harshaw Catalysts Catalog - 1972 - p. 25. |