Number | Date | Country | Kind |
---|---|---|---|
2542009 | Sep 1975 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3324205 | Carpenter et al. | Jun 1967 | |
3991010 | Noetzel et al. | Nov 1976 |
Number | Date | Country |
---|---|---|
362,023 | Dec 1973 | SUX |
Entry |
---|
Derwent's Central Patent Index, Sec. A, Plasdoc, vol. W, Nos. 19, 25 and 30 (1975). |
Ogawa et al., Chemical Abstracts, vol. 81 (1974) 4070t. |