using piezoelectric resonators

Introduced: July 1974

Last revised: January 2006

Full Title

Apparatus for producing preselected time intervals for use as timing standards > using oscillators with electromechanical resonators > using piezoelectric resonators

Classification Context

Section:: PHYSICS
Class:: HOROLOGY
Subclass:: TIME-INTERVAL MEASURING

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