• All sections
• C - Chemistry; metallurgy
• C21D - Modifying the physical structure of ferrous metals; general devices for heat treatment of ferrous or non-ferrous metals or alloys; making metal malleable, e.g. by decarburisation or tempering
• C21D 9/40 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for bearing races

Patent holdings for IPC class C21D 9/40

Total number of patents in this class: 545

10-year publication summary

Principal owners for this class