Number | Date | Country | Kind |
---|---|---|---|
3635313 | Oct 1986 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2306698 | Heller et al. | Dec 1942 | |
4238199 | Rothbuhr et al. | Dec 1980 |
Number | Date | Country |
---|---|---|
24654 | Mar 1981 | EPX |
2263968 | Jul 1974 | DEX |
1469883 | Feb 1967 | FRX |
1511746 | May 1978 | GBX |
1567734 | May 1980 | GBX |
Entry |
---|
Chemie-Technik 6, 1-1977, pp. 277-283. |