Inventor
Singo Ichikawa
Inventor
Sayama, JP
Overview
Patents· 17 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G04Gprimary
G04GElectronic time-pieces37%
G04CElectromechanical clocks or watches22%
G04RRadio-controlled time-pieces7%
Y02EReduction of greenhouse gas [ghg] emissions, related to energy generation, transmission or distribution7%
A61BDiagnosis4%
G01DMeasuring not specially adapted for a specific variable4%
G04DApparatus or tools specially designed for making or maintaining clocks or watches4%
H01HElectric switches4%
H01MProcesses or means, e.g. batteries, for the direct conversion of chemical energy into electrical energy4%
H02MApparatus for conversion between ac and ac, between ac and dc, or between dc and dc, and for use with mains or similar power supply systems4%
PatentTitleYear
4,780,841'Method and apparatus for stabilizing measured values for display'19884,451,743'DC-to-DC Voltage converter'19844,282,594'Electronic timepiece'19814,272,838'Electronic watch module structure'19814,270,193'Electronic timepiece'19814,268,913'Electronic calculator watch'19814,261,048'Analog quartz timepiece'19814,236,237'Electronic wristwatch'19804,232,512'Solid state watch module construction'19804,226,081'Electronic timepiece'19804,221,111'Electronic timepiece having a voltage conversion circuit'19804,219,999'Electronic timepiece equipped with battery life display'19804,216,649'Function selection circuit for multi-function timepiece'19804,178,750'Control circuit for electronic timepiece'19794,175,377'Timepiece with display device for warning battery life'19794,173,863'Analog quartz timepiece'19794,147,022'Electronic timepiece'1979Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1979–1988Patents assigned to CITIZEN WATCH CO LTD (17)· patent assignee history
1979–1988Based in Sayama, JP· patent location history
1980–1984Based in Tanashi, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CITIZEN WATCH CO LTD | 17 | 1979–1988 |
Locations
| Location | Patents | Span |
|---|---|---|
| Sayama, JP | 13 | 1979–1988 |
| Tanashi, JP | 4 | 1980–1984 |