Number | Name | Date | Kind |
---|---|---|---|
1452553 | Gardner | Apr 1923 | |
2255230 | Ross et al. | Sep 1941 | |
3669676 | Karr et al. | Jun 1972 | |
4016296 | DeSantis | Apr 1977 |
Number | Date | Country |
---|---|---|
670461 | Dec 1938 | DE2 |
825893 | Jun 1957 | DEX |
Entry |
---|
Chemical Abstracts, vol. 67, 101271(c) 1967. |