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DIFF Subgroup
B43K 5/02

Ink reservoirs

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Pens with ink reservoirs in holders, e.g. fountain-pens > Ink reservoirs

CPC:

Pens with ink reservoirs in holders, e.g. fountain-pens (nibs or writing-points with ink reservoirs B43K1/01; ball-point pens B43K7/00; pens with writing-points other than nibs or balls B43K8/00; multiple-point writing implements B43K27/00) > Ink reservoirs

Of 7 combined children, 6 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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  • B43K 5/025 CPC only CPC only
  • B43K 5/03 specially adapted for concentrated ink, e.g. solid ink since 1995 IPC+CPC Available in IPC and CPC
  • B43K 5/04 flexible IPC+CPC Available in IPC and CPC
  • B43K 5/10 with reserve ink chambers IPC+CPC Available in IPC and CPC
  • B43K 5/12 with ink-level inspection means 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