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DIFF Subgroup
G04B 21/02

Regular striking mechanisms giving the full hour, half hour or quarter hour

Introduced: September 1968

Title

Titles differ between systems:

IPC: Regular striking mechanisms giving the full hour, half hour, or quarter hour

CPC: Regular striking mechanisms giving the full hour, half hour or quarter hour

Full Title

Full titles differ between systems:

IPC:

Indicating the time by acoustic means > Regular striking mechanisms giving the full hour, half hour, or quarter hour

CPC:

Indicating the time by acoustic means (at preselected times G04B23/00; by electro-acoustic means G04C21/04; ) > Regular striking mechanisms giving the full hour, half hour or quarter hour

Of 8 combined children, 6 exist in both systems.

2 codes are CPC-only extensions.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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  • G04B 21/027 CPC only CPC only
  • G04B 21/04 Hour wheels; Racks or rakes; Snails or similar control mechanisms IPC+CPC Available in IPC and CPC
  • G04B 21/06 Details of striking mechanisms, e.g. hammer, fan governor IPC+CPC Available in IPC and CPC
  • G04B 21/08 Sounding bodies; Whistles; Musical apparatus (with electro-acoustical transmitters G04C21/00, ) IPC+CPC Available in IPC and CPC
  • G04B 21/10 Releasing or locking the regular stroke, e.g. for silence during the night IPC+CPC Available in IPC and CPC
  • G04B 21/12 Reiterating watches or clocks IPC+CPC Available in IPC and CPC
  • G04B 21/14 Winding-up the striking mechanism by the clockwork; winding up the clockwork by the striking mechanism IPC+CPC Available in IPC and CPC

Top Applicants

Top Applicants (IPC)

Class G04,2013–2023, worldwide · Source: EPO PATSTAT

  1. THE SWATCH GROUP RESEARCH AND DEVELOPMENT CH 1,570
  2. ETA SA MANUFACTURE HORLOGERE SUISSE CH 1,409
  3. CASIO COMPUTER COMPANY 1,172
  4. SEIKO EPSON CORPORATION 1,100
  5. SAMSUNG ELECTRONICS COMPANY KR 768
  6. NIVAROX-FAR CH 750
  7. MONTRES BREGUET CH 707
  8. APPLE US 706
  9. SEIKO EPSON CORPORATION JP 648
  10. CITIZEN WATCH COMPANY 578

Top Applicants (CPC)

Class G04,2013–2023, worldwide · Source: EPO PATSTAT

  1. THE SWATCH GROUP RESEARCH AND DEVELOPMENT CH 1,705
  2. ETA SA MANUFACTURE HORLOGERE SUISSE CH 1,443
  3. SAMSUNG ELECTRONICS COMPANY KR 1,104
  4. APPLE US 1,038
  5. SEIKO EPSON CORPORATION 875
  6. NIVAROX-FAR CH 781
  7. CASIO COMPUTER COMPANY 734
  8. MONTRES BREGUET CH 715
  9. SEIKO EPSON CORPORATION JP 715
  10. OMEGA CH 555