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DIFF Subgroup
G04B 1/20

Protecting arrangements against rupture or overwinding of the mainspring located in the barrel or attached to the barrel (in connection with keys or the like G04B3/06, G04B3/10; in connection with automatic winding devices G04B5/24 )

Introduced: September 1968

Title

Titles differ between systems:

IPC: Protecting arrangements against rupture or overwinding of the mainspring located in the barrel or attached to the barrel

CPC: Protecting arrangements against rupture or overwinding of the mainspring located in the barrel or attached to the barrel (in connection with keys or the like G04B3/06, G04B3/10; in connection with automatic winding devices G04B5/24 )

Full Title

Full titles differ between systems:

IPC:

Driving mechanisms > with mainspring > Constructions for connecting the ends of mainsprings with the barrel or the arbor > Protecting arrangements against rupture or overwinding of the mainspring located in the barrel or attached to the barrel

CPC:

Driving mechanisms > with mainspring > Constructions for connecting the ends of the mainsprings with the barrel or the arbor > Protecting arrangements against rupture or overwinding of the mainspring located in the barrel or attached to the barrel (in connection with keys or the like G04B3/06, G04B3/10; in connection with automatic winding devices G04B5/24 )

Of 1 combined children, 0 exist in both systems.

1 codes are CPC-only extensions.

Child Classifications

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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