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IPC Subgroup
G04B 17/2

Compensation of mechanisms for stabilizing frequency

Introduced: September 1968

Last revised: January 2006

Full Title

Mechanisms for stabilising frequency > Compensation of mechanisms for stabilizing frequency

Classification Context

Section:
PHYSICS
Class:
HOROLOGY
Subclass:
MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME-PIECES USING THE POSITION OF THE SUN, MOON, OR STARS

4 direct subcodes

Child Classifications

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  • G04B 17/22 for the effect of variations of temperature
  • G04B 17/24 for the effect of variations of atmospheric pressure
  • G04B 17/26 for the effect of variations of the impulses
  • G04B 17/28 for the effect of imbalance of the weights, e.g. tourbillon

Top Applicants

Top 10 applicants by patent filingsfor 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