Number | Date | Country | Kind |
---|---|---|---|
100 48 813 | Sep 2000 | DE |
Number | Name | Date | Kind |
---|---|---|---|
1800758 | Schwarzkopf | Apr 1931 | A |
5125964 | Buerkel et al. | Jun 1992 | A |
Number | Date | Country |
---|---|---|
381 205 | Sep 1923 | DE |
300 754 | Jul 1992 | DE |
41 16 949 | Jan 1993 | DE |
0 204 564 | Dec 1986 | EP |
0 889 006 | Jul 1997 | EP |
0 889 006 | Jan 1999 | EP |
Entry |
---|
Kieffer, et al., “Tungsten Recycling in Todays Environment”, BHM, 139 (1994) vol. 9, pp. 340-345. |
Database EPODOC, CN 1053378 A (Ganzhou Tungsten Molybdenum MA (CN) ), Jul. 31, 1991, XP 002183999. |