Note(s) In this sub-class, groups for obtaining metals include obtaining the metals by non-metallurgical processes, and obtaining metal compounds by metallurgical processes. Thus, for example, group Fulltext... Hierarchy... Expanded...C22B 11/00 covers the production of silver by reduction of ammoniacal silver oxide in solution, and group Fulltext... Hierarchy... Expanded...C22B 17/00 includes the production of cadmium oxide by a metallurgical process. Furthermore, although compounds of arsenic and antimony are classified in Fulltext... Hierarchy... Expanded...C01B, production of the elements themselves is included in Fulltext... Hierarchy... Expanded...C22B, as well as the production of their compounds by metallurgical processes. |