Number | Date | Country | Kind |
---|---|---|---|
2235815 | Jul 1972 | DT |
Number | Name | Date | Kind |
---|---|---|---|
401634 | Bohn | Apr 1889 | |
625198 | Phillips et al. | May 1899 | |
1697107 | Glingestein et al. | Jan 1929 | |
1751683 | Clingestein et al. | Mar 1930 | |
1975411 | Stusser et al. | Oct 1934 | |
2014484 | Stusser et al. | Sep 1935 | |
2061126 | Zahn et al. | Nov 1936 | |
2872440 | Davies | Feb 1959 |
Entry |
---|
Cohn "Die Carbazolgruppe" (1919) pp. 151-152, Verlag Georg Thieme |