• All sections
• C - Chemistrymetallurgy
• C21D - Modifying the physical structure of ferrous metalsgeneral devices for heat treatment of ferrous or non-ferrous metals or alloysmaking metal malleable, e.g. by decarburisation or tempering
• C21D 9/44 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for equipment for lining mine shafts, e.g. segments, rings or props

Patent holdings for IPC class C21D 9/44

Total number of patents in this class: 7

10-year publication summary

Principal owners for this class