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DIFF Subgroup
B43L 11/04

for drawing ellipses

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Non-circular-curve-drawing instruments > for drawing conic sections > for drawing ellipses

CPC:

Non-circular-curve-drawing instruments (curve rulers or templets B43L13/20) > for drawing conic sections > for drawing ellipses

Of 5 combined children, 3 exist in both systems.

2 codes are CPC-only extensions.

IPC defines codes here since 1990.

Child Classifications

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  • B43L 11/041 CPC only CPC only
  • B43L 11/043 CPC only CPC only
  • B43L 11/045 with cords or like flexible elements since 1990 IPC+CPC Available in IPC and CPC
  • B43L 11/05 with gears since 1990 IPC+CPC Available in IPC and CPC
  • B43L 11/055 with guides since 1990 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