TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R29/02; in radar or like systems G01S)

Description

G04F covers devices and methods for measuring time intervals and durations between events, including stopwatches, timers, and interval measurement instruments. This subclass encompasses mechanical, electronic, and digital mechanisms that measure, display, and control specific time periods for practical applications such as sports timing, industrial processes, and scientific experiments. Excluded are general timekeeping and clock mechanisms (G04B), clocks with specific functions (G04C-G04E), and time-of-day displays without interval measurement capability.

7 direct subcodes

Child Classifications

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G04F 1/00 Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals without driving mechanisms, e.g. egg timers
G04F 10/00 Apparatus for measuring unknown time intervals by electric means
G04F 13/00 Apparatus for measuring unknown time intervals by means not provided for in groups G04F5/00 - G04F10/00
G04F 3/00 Apparatus which can be set and started to measure-off predetermined or adjustably-fixed time intervals with driving mechanisms, e.g. dosimeters with clockwork
G04F 5/00 Apparatus for producing preselected time intervals for use as timing standards (generating clock signals for electric digital computers G06F1/04)
G04F 7/00 Apparatus for measuring unknown time intervals by non-electric means (using fluidic means G04F13/06)
G04F 8/00 Apparatus for measuring unknown time intervals by electromechanical 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