CPC Subgroup
B28B 21/42 by shaping on or against mandrels or like moulding surfaces
Full Title
Methods or machines specially adapted for the production of tubular articles > by shaping on or against mandrels or like moulding surfaces
4 direct subcodes
Child Classifications
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- B28B 21/44 by projecting, e.g. spraying
- B28B 21/46 by dipping
- B28B 21/48 by wrapping, e.g. winding
- B28B 21/50 Details of compression or compacting means
Top Applicants
Top 10 applicants by patent filingsfor class B28, 2013–2023, worldwide · Source: EPO PATSTAT
- DISCO CORPORATION JP 1,471
- HILTI LI 575
- CORNING US 544
- MITSUBOSHI DIAMOND INDUSTRIAL COMPANY JP 518
- UNITED STATES GYPSUM COMPANY US 485
- DISCO ABRASIVE SYSTEM 459
- GE (GENERAL ELECTRIC COMPANY) US 454
- MITSUBOSHI DIAMOND INDUSTRIAL COMPANY 439
- DISCO CORPORATION 403
- NGK INSULATORS JP 308