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Inventor

Shigeru Morokawa

Inventor
Higashiyamato, JP

Overview

67→
Patents
1976–2008
Patent span
Physics
Primary field (CPC G)

Patents· 67 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G04Gprimary
G04GElectronic time-pieces28%
G04CElectromechanical clocks or watches17%
G09GArrangements or circuits for control of indicating devices using static means to present variable information9%
G04FTime-interval measuring7%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein7%
H03KPulse technique4%
H03LAutomatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses4%
H04NPictorial communication, e.g. television4%
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 systems3%
G04BMechanically-driven clocks or watches2%
PatentTitleYear
7,436,737'Electric timepiece'20087,084,976'Concentration measuring instrument'20066,999,058'Power supply circuit for driving liquid crystal display device'20066,894,952'Timer of electric timepiece'20056,826,209'Ultrabroad-band variable-wavelength wavelength-multiplexed pulse waveform shaping device'20046,583,506'Semiconductor device'20036,515,645'Liquid crystal display apparatus'20036,301,198'Electronic timepiece'20016,023,252'Liquid crystal display device'20005,815,233'Optical device containing a liquid crystal element for changing optical characteristics of a lens element'19985,654,782'Liquid crystal optical modulator device with each electrode width smaller than both the liquid crystal thickness and the electrode gaps'19975,101,116'Multi-level voltage generator to drive LCD'19924,843,252'Selecting electrode drive circuit for a matrix liquid crystal display'19894,824,213'Liquid crystal display having opaque portions on the electrodes'19894,679,043'Method of driving liquid crystal matrix display'19874,663,670'Television receiver having a liquid crystal display device'19874,630,122'Television receiver with liquid crystal matrix display panel'19864,602,292'Driving system for matrix display device'19864,581,649'Image pickup system'19864,465,999'Matrix driving method for electro-optical display device'19844,453,834'Electronic timepiece with temperature compensation'19844,441,826'Electronic timepiece'19844,441,825'Low-power integrated circuit for an electronic timepiece'19844,433,920'Electronic timepiece having improved primary frequency divider response characteristics'1984RE031402'Electronic timepiece'19834,346,350'FET Quartz oscillators'19824,337,529'Pace timing device'19824,302,829'Electronic timepiece'19814,302,828'Electronic timepiece'19814,300,137'Matrix driving method for electro-optical display device'19814,298,971'Electronic timpiece'19814,292,680'Electronic timepiece'19814,270,194'Electronic alarm timepiece'1981RE030588'Electric timepiece for displaying the operating condition thereof'19814,262,351'Electronic timepiece'19814,259,715'Voltage conversion system for electronic timepiece'19814,236,241'Electronic timepiece'19804,234,945'Electronic timepiece with hourly strike mechanism'19804,232,510'Timepiece'19804,205,518'Voltage conversion system for electronic timepiece'19804,199,699'Motor and drive for a timepiece'19804,173,862'Booster circuit for electronic timepiece'19794,150,535'Electronic timepiece'19794,119,867'Frequency division circuit'19784,107,915'Electronic timepiece'19784,100,540'Method of driving liquid crystal matrix display device to obtain maximum contrast and reduce power consumption'19784,099,371'Electronic optical display alarm timepiece'19784,094,135'Switch control unit for electronic timepiece'19784,094,137'Voltage conversion system for electronic timepiece'19784,067,187'Electronic timepiece'19784,058,969'Electric timepiece for displaying the operating condition thereof'19774,045,692'Solid state binary logic signal source for electronic timepiece or the like'19774,024,416'Method for controlling frequency of electrical oscillations and frequency standard for electronic timepiece'19774,016,476'Booster circuits'19774,015,419'Electronic timepiece'19774,003,198'Electronic timepiece'19773,999,370'Temperature compensated electronic timepiece'19763,998,043'Electric timepiece for displaying the operating condition thereof'19763,979,608'Solid state binary logic signal source for electronic timepiece or the like'19763,978,650'Electric timepiece'19763,971,205'All electronic-type timepiece'19763,971,012'Display device employing special-purpose monograms'19763,961,840'Driving circuit for liquid-crystal display'19763,948,036'Electronic timepiece'19763,940,919'Electronic wristwatch with electronic sound emitter device'19763,938,316'Temperature compensated electronic timepiece'19763,937,004'Portable miniature type information treating device'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–2006Patents assigned to CITIZEN WATCH CO LTD (62)· patent assignee history
1976–2006Based in Higashiyamato, JP· patent location history
1976–2000Based in Tokorozawa, JP· patent location history
1977–1979Patents assigned to MOROKAWA SHIGERU (2)· patent assignee history
1978–2008Based in Tokyo, JP· patent location history
1979Patents assigned to DAIGO KUNIHIRO (1)· patent assignee history
1979Patents assigned to HATUSE TOSHIKAZU (1)· patent assignee history
1984Based in Tanashi, JP· patent location history
2003Based in Higashiyamoto, JP· patent location history
2008Patents assigned to CITIZEN HOLDINGS CO LTD (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
CITIZEN WATCH CO LTD621976–2006
MOROKAWA SHIGERUself21977–1979
CITIZEN HOLDINGS CO LTD12008
DAIGO KUNIHIRO11979
HATUSE TOSHIKAZU11979
Locations
LocationPatentsSpan
Higashiyamato, JP391976–2006
Tokorozawa, JP171976–2000
Tokyo, JP71978–2008
Higashiyamoto, JP12003
Tanashi, JP11984