|  | C |
SECTION C — CHEMISTRY AND METALLURGY

|  | C |
Note(s) Definitions for Section C: Alkali metals: Li, Na, K, Rb, Cs, Fr Alkaline earth metals: Ca, Sr, Ba, Ra Lanthanides: elements with atomic numbers 57 to 71 inclusive Rare earths: Sc, Y, Lanthanides Actinides: elements with atomic numbers 89 to 103 inclusive Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W Halogens: F, Cl, Br, I, At Noble gases: He, Ne, Ar, Kr, Xe, Rn Platinum group: Os, Ir, Pt, Ru, Rh, Pd Noble metals: Ag, Au, Platinum group Light metals: alkali metals, alkaline earth metals, Be, Al, Mg Heavy metals: metals other than light metals Iron group: Fe, Co, Ni Non-metals: H, B, C, Si, N, P, O, S, Se, Te, noble gases, halogens Metals: elements other than non-metals Transition elements: elements with atomic numbers 21 to 30 inclusive, 39 to 48 inclusive, 57 to 80 inclusive, 89 upwards

METALLURGY

|  | C22 |
METALLURGY (of iron Fulltext... Hierarchy... Expanded...C21); FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS (general methods or devices for heat treatment of ferrous or non-ferrous metals or alloys Fulltext... Hierarchy... Expanded...C21D; production of metals by electrolysis or electrophoresis Fulltext... Hierarchy... Expanded...C25)

|  | C22B |
PRODUCTION OR REFINING OF METALS (making metallic powder or suspensions thereof Fulltext... Hierarchy... Expanded...B22F 9/00; electrolytic Fulltext... Hierarchy... Expanded...C25); PRETREATMENT OF RAW MATERIALS

|  | C22B |
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...C01G, production of the elements themselves is included in Fulltext... Hierarchy... Expanded...C22B, as well as the production of their compounds by metallurgical processes.

|  | C22C |
ALLOYS (treatment thereof Fulltext... Hierarchy... Expanded...C21D, Fulltext... Hierarchy... Expanded...C22F)

|  | C22C |
Note(s) In groups Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...C22C 5/00-C22C 32/00 an alloy is classified in the last appropriate place. [2] The term "based on" requires at least 50% by weight of the specified constituent or of the specified group of constituents. [2]

|  | C22F |
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS