Number | Name | Date | Kind |
---|---|---|---|
3012878 | Muller | Dec 1961 | |
3880652 | Wehn et al. | Apr 1975 | |
4285724 | Becker et al. | Aug 1981 | |
4445931 | Worthington | May 1984 | |
4820339 | Bibuvenu et al. | Apr 1989 | |
4897116 | Scheel | Jan 1990 | |
5098471 | Abodishish et al. | Mar 1992 |
Number | Date | Country |
---|---|---|
236221 | Sep 1987 | EPX |
648633 | Feb 1979 | SUX |
2231883 | Nov 1990 | GBX |
Entry |
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Hagelston, P. J. et al., "Hafnium Metal-II Reduction of Hafnium Tetrafluoride to Hafnium Metal," U.S. Atomic Energy Commission, Aug. 30, 1950. |