G04C ELECTROMECHANICAL CLOCKS OR WATCHES
Introduced: September 1968
Classification Context
- Section:
- PHYSICS
- Class:
- HOROLOGY
- Subclass:
- ELECTROMECHANICAL CLOCKS OR WATCHES
Description
G04C covers timepieces that combine mechanical timekeeping elements with electrical components for regulation, display, or operation. This includes electromechanical watches and clocks where electric power drives the mechanical movement, electromagnets control oscillation or escapement mechanisms, or electrical circuits synchronize mechanical timekeeping functions. Typical technologies encompass stepping motors, electromagnetic balance wheels, and electrically-maintained pendulums used in hybrid analog and digital display systems. Digital-only electronic timepieces and purely mechanical clocks without electrical components are classified elsewhere.
Related Keywords
13 direct subcodes
Child Classifications
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- G04C 1/00 Winding mechanical clocks electrically
- G04C 10/00 Arrangements of electric power supplies in time-pieces
- G04C 11/00 Synchronisation of independently-driven clocks
- G04C 13/00 Driving mechanisms for clocks by primary clocks
- G04C 15/00 Clocks driven by synchronous motors
- G04C 17/00 Indicating the time optically by electric means
- G04C 19/00 Producing optical time signals at prefixed times by electric means
- G04C 21/00 Producing acoustic time signals by electrical means
- G04C 23/00 Clocks with attached or built-in means operating any device at preselected times or after preselected time-intervals
- G04C 3/00 Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
- G04C 5/00 Electric or magnetic means for converting oscillatory to rotary motion in time-pieces, i.e. electric or magnetic escapements
- G04C 9/00 Electrically-actuated devices for setting the time-indicating means
- G04C 99/00 Subject matter not provided for in other groups of this subclass
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