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CPC Subgroup
B28B 21/02

by casting into moulds

Full Title

Methods or machines specially adapted for the production of tubular articles > by casting into moulds

Filing statistics

CPC B28B 21/02 belongs to the parent subclass B28B, which recorded 57,301 patent applications worldwide between 2013 and 2023. Annual filings grew from 2,365 in 2013 to 5,105 in 2023 (+116%), peaking at 7,697 applications in 2020. The most active applicants in class B28 are DISCO CORPORATION (1,471 applications), HILTI (575 applications) and CORNING (544 applications).

Source: EPO PATSTAT, worldwide filings

4 direct subcodes

Child Classifications

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  • B28B 21/04 by simple casting, the material being neither positively compacted nor forcibly fed
  • B28B 21/06 into moulds having sliding parts (B28B21/26 takes precedence; forms, shutterings, or falsework for making rooms as a whole, whole stories, or whole buildings in situ E04G11/02)
  • B28B 21/08 by slip-casting; Moulds therefor

Top Applicants

Top 10 applicants by patent filingsfor class B28, 2013–2023, worldwide · Source: EPO PATSTAT

  1. DISCO CORPORATION JP 1,471
  2. HILTI LI 575
  3. CORNING US 544
  4. MITSUBOSHI DIAMOND INDUSTRIAL COMPANY JP 518
  5. UNITED STATES GYPSUM COMPANY US 485
  6. DISCO ABRASIVE SYSTEM 459
  7. GE (GENERAL ELECTRIC COMPANY) US 454
  8. MITSUBOSHI DIAMOND INDUSTRIAL COMPANY 439
  9. DISCO CORPORATION 403
  10. NGK INSULATORS JP 308