HOROLOGY

Description

G04 covers the design, construction, and operation of devices for measuring and indicating time. This includes mechanical and electronic clocks, watches, chronometers, timing mechanisms, and related apparatus such as pendulums, escapements, and balance wheels. The class also encompasses time-measuring instruments used in scientific and industrial applications, as well as apparatus for controlling or synchronizing time-dependent processes. Excluded are general timekeeping methods (classified in other IPC sections) and electronic display systems not integral to the timekeeping mechanism itself.

IPC and CPC are identically structured here. All 6 subcodes exist in both systems.

2 shared codes have differing titles between IPC and CPC.

Child Classifications

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G04B MECHANICALLY-DRIVEN CLOCKS OR WATCHES; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS (spring- or weight-driven mechanisms in general F03G; electromechanical clocks or watches G04C; electromechanical clocks with attached or built-in means operating any device at pre-selected times or after predetermined time intervals G04C23/00; clocks or watches with stop devices G04F7/08) heading IPC+CPC Available in IPC and CPC
G04C ELECTROMECHANICAL CLOCKS OR WATCHES heading IPC+CPC Available in IPC and CPC
G04D APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES heading IPC+CPC Available in IPC and CPC
G04F TIME-INTERVAL MEASURING (measuring pulse characteristics G01R, e.g. G01R29/02; in radar or like systems G01S) heading IPC+CPC Available in IPC and CPC
G04G ELECTRONIC TIME-PIECES heading since 1980 IPC+CPC Available in IPC and CPC
G04R RADIO-CONTROLLED TIME-PIECES heading since 2013 IPC+CPC Available in IPC and CPC