Inventor
ICHIKAWA SINGO
JP17 patents
Patents
17 patentsUS4451743AMay 29, 1984
DC-to-DC Voltage converter
CITIZEN WATCH CO LTD1,566 citations98
US4232512ANov 11, 1980
Solid state watch module construction
CITIZEN WATCH CO LTD40 citations90
US4272838AJun 9, 1981
Electronic watch module structure
CITIZEN WATCH CO LTD39 citations89
US4147022AApr 3, 1979
Electronic timepiece
CITIZEN WATCH CO LTD21 citations81
US4268913AMay 19, 1981
Electronic calculator watch
CITIZEN WATCH CO LTD22 citations80
US4219999ASep 2, 1980
Electronic timepiece equipped with battery life display
CITIZEN WATCH CO LTD19 citations74
US4282594AAug 4, 1981
Electronic timepiece
CITIZEN WATCH CO LTD14 citations73
US4178750ADec 18, 1979
Control circuit for electronic timepiece
CITIZEN WATCH CO LTD7 citations73
US4221111ASep 9, 1980
Electronic timepiece having a voltage conversion circuit
CITIZEN WATCH CO LTD7 citations71
US4261048AApr 7, 1981
Analog quartz timepiece
CITIZEN WATCH CO LTD20 citations70
US4216649AAug 12, 1980
Function selection circuit for multi-function timepiece
CITIZEN WATCH CO LTD13 citations70
US4173863ANov 13, 1979
Analog quartz timepiece
CITIZEN WATCH CO LTD10 citations70
US4780841AOct 25, 1988
Method and apparatus for stabilizing measured values for display
CITIZEN WATCH CO LTD5 citations62
US4270193AMay 26, 1981
Electronic timepiece
CITIZEN WATCH CO LTD4 citations62
US4236237ANov 25, 1980
Electronic wristwatch
CITIZEN WATCH CO LTD4 citations62
US4226081AOct 7, 1980
Electronic timepiece
CITIZEN WATCH CO LTD4 citations62
US4175377ANov 27, 1979
Timepiece with display device for warning battery life
CITIZEN WATCH CO LTD6 citations62