IPC Main Group
B28B 21/00 Methods or machines specially adapted for the production of tubular articles
Introduced: September 1968
Last revised: January 2006
Classification Context
- Section:
- PERFORMING OPERATIONS; TRANSPORTING
- Class:
- WORKING CEMENT, CLAY, OR STONE
- Subclass:
- SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
Related Keywords
moulding CONCRETE pipesmaking clay PIPE(S)making concrete PIPE(S)moulding TUBE(S) from clay or other ceramic compositions or cementitious material
9 direct subcodes
Child Classifications
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- B28B 21/02 by casting into moulds
- B28B 21/42 by shaping on or against mandrels or like moulding surfaces
- B28B 21/52 by extruding
- B28B 21/56 incorporating reinforcements
- B28B 21/7 by building-up from preformed elements
- B28B 21/76 Moulds
- B28B 21/86 Cores
- B28B 21/9 Methods or apparatus for discharging after shaping
- B28B 21/92 Methods or apparatus for treating or reshaping