Number | Date | Country | Kind |
---|---|---|---|
52-151632 | Dec 1977 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
2631162 | Ladd et al. | Mar 1953 | |
2664438 | Ladd et al. | Dec 1953 | |
2971019 | Ladd et al. | Feb 1961 | |
3832394 | Niida et al. | Aug 1974 |
Number | Date | Country |
---|---|---|
130354 | Mar 1978 | DDX |
49-13123 | Feb 1974 | JPX |
Entry |
---|
Gruszecka et al., "Chem. Abstracts" vol. 85, No. 1, (1976), p. 467, item 85:5777y. _ |