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DIFF Subgroup
B43K 21/08

with the writing-cores fed by screws

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Propelling pencils > Writing-core feeding mechanisms > with the writing-cores fed by screws

CPC:

Propelling pencils (projecting mechanisms for writing units B43K24/00; multiple-point writing implements B43K27/00) > Writing-core feeding mechanisms > with the writing-cores fed by screws

Of 4 combined children, 3 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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  • B43K 21/085 CPC only CPC only
  • B43K 21/10 with separate writing-core remnants ejecting-bar IPC+CPC Available in IPC and CPC
  • B43K 21/12 with means preventing overwinding IPC+CPC Available in IPC and CPC
  • B43K 21/14 with writing-cores automatically replaced from magazines IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class B43,2013–2023, worldwide · Source: EPO PATSTAT

  1. PILOT CORPORATION 1,100
  2. MITSUBISHI PENCIL COMPANY 818
  3. SOCIETE BIC FR 380
  4. MITSUBISHI PENCIL COMPANY JP 371
  5. PILOT CORPORATION JP 273
  6. DELI GROUP COMPANY 249
  7. SHANGHAI M&G STATIONERY 176
  8. PENTEL 169
  9. ZEBRA PEN CORPORATION 153
  10. GUANGZHOU SHIRUI ELECTRICAL TECHNOLOGY COMPANY 124

Top Applicants (CPC)

Class B43,2013–2023, worldwide · Source: EPO PATSTAT

  1. SOCIETE BIC FR 422
  2. MITSUBISHI PENCIL COMPANY JP 381
  3. PILOT CORPORATION JP 299
  4. MITSUBISHI PENCIL COMPANY 213
  5. PILOT CORPORATION 100
  6. WACOM COMPANY JP 89
  7. STAEDTLER MARS & COMPANY DE 87
  8. KOTOBUKI JP 82
  9. CRAYOLA US 78
  10. SANFORD US 73