CPC Main Group
G04F 13/00 Apparatus for measuring unknown time intervals by means not provided for in groups G04F5/00 - G04F10/00
3 direct subcodes
Child Classifications
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- G04F 13/02 using optical means
- G04F 13/04 using electrochemical means
- G04F 13/06 using fluidic means
Top Applicants
Top 10 applicants by patent filingsfor class G04, 2013–2023, worldwide · Source: EPO PATSTAT
- THE SWATCH GROUP RESEARCH AND DEVELOPMENT CH 1,705
- ETA SA MANUFACTURE HORLOGERE SUISSE CH 1,443
- SAMSUNG ELECTRONICS COMPANY KR 1,104
- APPLE US 1,038
- SEIKO EPSON CORPORATION 875
- NIVAROX-FAR CH 781
- CASIO COMPUTER COMPANY 734
- MONTRES BREGUET CH 715
- SEIKO EPSON CORPORATION JP 715
- OMEGA CH 555