Number | Date | Country | Kind |
---|---|---|---|
2549036 | Nov 1975 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2985688 | Mersch et al. | May 1961 | |
3642866 | Witt et al. | Feb 1972 | |
3715323 | Crivello | Feb 1973 |
Entry |
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Recueil des Travaux Chemiques, 36, 52 (1916). |
Ibid, 40, 510, 512 (1921). |