The International Patent Classification *** is divided into eight major parts, and chemical metallurgy belongs to Part C.
The eight parts are: Part A: Living needs Part B: Operations; Transportation Part C: Chemistry; Metallurgy Part D: Textiles; Papermaking Part E: Fixed buildings Part F: Mechanical engineering; Lighting; Heating; Explosion Section G: Physics Section H: Electricity
In Section C, the definitions of each chemical element group are as follows: Alkali metals: Li, Na, K, Rb, Cs, Fr Alkaline earth metals: Ca, Sr , Ba, Ra Lanthanides: elements with atomic numbers from 57 to 71 Rare earth metals: Sc, Y, lanthanides Actinides: elements with atomic numbers from 89 to 103 Refractory metals: Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W Halogens: F, Cl, Br, I, At Inert gases: He, Ne, Ar, Kr, Xe, Rn Platinum group metals: Os, Ir, Pt, Ru, Rh, Pd Noble metals : Ag, Au, platinum group metals Light metals: Alkali metals, alkaline earth metals, Be, Al, Mg Heavy metals: Metals other than light metals Iron group metals: Fe, Co, Ni Non-metals: H, B, C, Si, N, P, O, S, Se, Te, inert gases, halogens Metals: elements other than non-metals Transition elements: elements with atomic numbers from 21 to 30, 39 to 48, 57 to 80, and above 89
Part C includes: a. Pure chemistry, including inorganic compounds, organic compounds, polymer compounds and their preparation methods; b. Applied chemistry, including compositions containing the above compounds, such as: glass, ceramics, fertilizers, plastic compositions, Coatings, petroleum industry products. It also includes some compositions suitable for certain uses due to their special properties, such as explosives, dyes, adhesives, lubricants and detergents; c. Certain marginal industries, such as coke manufacturing, solid fuel or gaseous fuel manufacturing, oil , production and refining of fats and waxes, fermentation industry (such as brewing and winemaking), sugar industry; d. Certain operations or treatments, which are either purely mechanical (such as mechanical treatment of leather and raw hides) or partially Mechanical (such as water treatment or general corrosion protection); e. Metallurgy, ferrous alloys or non-ferrous alloys.