IPC Main Group
G04F 10/00 Apparatus for measuring unknown time intervals by electric means
Introduced: July 1974
Last revised: January 2006
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- TIME-INTERVAL MEASURING
Related Keywords
electric OSCILLATORS used for time measurement
5 direct subcodes
Child Classifications
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- G04F 10/02 using oscillators with passive electric resonator, e.g. lumped LC
- G04F 10/04 by counting pulses or half-cycles of an AC
- G04F 10/06 by measuring phase
- G04F 10/08 using pulses produced by radio-isotopes
- G04F 10/1 by measuring electric or magnetic quantities changing in proportion to time
Top Applicants
Top 10 applicants by patent filingsfor class G04, 2013–2023, worldwide · Source: EPO PATSTAT
- THE SWATCH GROUP RESEARCH AND DEVELOPMENT CH 1,570
- ETA SA MANUFACTURE HORLOGERE SUISSE CH 1,409
- CASIO COMPUTER COMPANY 1,172
- SEIKO EPSON CORPORATION 1,100
- SAMSUNG ELECTRONICS COMPANY KR 768
- NIVAROX-FAR CH 750
- MONTRES BREGUET CH 707
- APPLE US 706
- SEIKO EPSON CORPORATION JP 648
- CITIZEN WATCH COMPANY 578