Number | Date | Country | Kind |
---|---|---|---|
2544504 | Oct 1975 | DT | |
2549305 | Nov 1975 | DT | |
2549957 | Nov 1975 | DT | |
2606363 | Feb 1976 | DT |
Number | Name | Date | Kind |
---|---|---|---|
2503778 | Stone et al. | Apr 1950 |
Number | Date | Country |
---|---|---|
1,958,168 | Jul 1970 | DT |
48-91194 | Nov 1973 | JA |
Entry |
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Vrany et al., "Chemical Abstracts," vol. 69, Abstract No. 97450g (1968). |