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PCE
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DIFF Subgroup
B28B 21/42

by shaping on or against mandrels or like moulding surfaces

Introduced: September 1968

Full Title

Methods or machines specially adapted for the production of tubular articles > by shaping on or against mandrels or like moulding surfaces

IPC and CPC are identically structured here. All 4 subcodes exist in both systems.

Child Classifications

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  • B28B 21/44 by projecting, e.g. spraying IPC+CPC Available in IPC and CPC
  • B28B 21/46 by dipping IPC+CPC Available in IPC and CPC
  • B28B 21/48 by wrapping, e.g. winding IPC+CPC Available in IPC and CPC
  • B28B 21/50 Details of compression or compacting means IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class B28,2013–2023, worldwide · Source: EPO PATSTAT

  1. MITSUBOSHI DIAMOND INDUSTRIAL COMPANY 868
  2. QINGDAO GAOCE TECHNOLOGY COMPANY 678
  3. DISCO CORPORATION JP 500
  4. ZHOU ZHAODI 500
  5. MITSUBOSHI DIAMOND INDUSTRIAL COMPANY JP 456
  6. HILTI LI 455
  7. CORNING US 407
  8. UNITED STATES GYPSUM COMPANY US 375
  9. ZHENGZHOU YUAN DONG REFRACTORIES COMPANY 370
  10. HUNAN SANY KUAIERJU RESIDENTIAL INDUSTRY COMPANY 351

Top Applicants (CPC)

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