• All sections
• B - Performing operations; transporting
• B28B - Shaping clay or other ceramic compositions; shaping slag; shaping mixtures containing cementitious material, e.g. plaster
• B28B 21/20 - Methods or machines specially adapted for the production of tubular articles by casting into moulds using compacting means using expansible or retractable mould or core elements using inflatable cores, e.g. having a frame inside the inflatable part of the core

Patent holdings for IPC class B28B 21/20

Total number of patents in this class: 5

10-year publication summary

Principal owners for this class