Number | Name | Date | Kind |
---|---|---|---|
820374 | Weise et al. | May 1906 | |
1274169 | Lackman | Jul 1918 | |
1995211 | Leroux | Mar 1935 | |
3995012 | Barnert et al. | Nov 1976 |
Entry |
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Royen et al., "Erdol u. Kohle" 6: 195-199, 1953. |
Royen et al., "Erdol u. Kohle" 9 :19, pp. 19-24, 1956. |
Suzuki et al., "Chemical Abstracts", vol. 80, 1974, 95277j. |