DIFF Main Group
B21K 21/00 Making hollow articles not covered by a single preceding sub-group (essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00)
Introduced: September 1968
Title
Titles differ between systems:
IPC: Making hollow articles not covered by any single one of groups
CPC: Making hollow articles not covered by a single preceding sub-group (essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00)
Full Title
Full titles differ between systems:
IPC:
Making hollow articles not covered by any single one of groups
CPC:
Making hollow articles not covered by a single preceding sub-group (essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00)
IPC and CPC are identically structured here. All 6 subcodes exist in both systems.
2 shared codes have differing titles between IPC and CPC.
Child Classifications
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- B21K 21/02 Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded IPC+CPC Available in IPC and CPC
- B21K 21/08 Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs IPC+CPC Available in IPC and CPC
- B21K 21/16 Remodelling hollow bodies with respect to the shape of the cross-section (remodelling end portions only B21K21/12) IPC+CPC Available in IPC and CPC