Number | Date | Country | Kind |
---|---|---|---|
71.23198 | Jun 1971 | FR |
Number | Name | Date | Kind |
---|---|---|---|
2692281 | Newby et al. | Oct 1954 | |
2801195 | Doerr | Jul 1957 | |
3227753 | Mehr et al. | Jan 1966 | |
3415882 | Jenkins et al. | Dec 1968 | |
3527753 | Needham et al. | Sep 1970 |
Number | Date | Country |
---|---|---|
1,186,021 | Apr 1970 | UK |
Entry |
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Curtius et al., Journal F. Prakt. Chemie, Band 44, No. 2, pp. 199-200, (1891). |