Inventor
Fumio Nakajima
Inventor
Tokyo, JP
Overview
Patents· 37 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G04Cprimary
G04CElectromechanical clocks or watches27%
H02KDynamo-electric machines15%
G01CMeasuring distances, levels or bearings8%
H02PControl or regulation of electric motors, electric generators or dynamo-electric converters8%
G04GElectronic time-pieces7%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests5%
B60SServicing, cleaning, repairing, supporting, lifting, or manoeuvring of vehicles, not otherwise provided for3%
G11BInformation storage based on relative movement between record carrier and transducer3%
H01JElectric discharge tubes or discharge lamps3%
H04NPictorial communication, e.g. television3%
PatentTitleYear
7,623,176'Meta-data display system, meta-data synthesis apparatus, video-signal recording/reproduction apparatus, imaging apparatus and meta-data display method'20097,501,736'Miniature motor'20097,466,352'Gamma correction device in image capturing apparatus'20087,154,203'Motor and brush device'20066,649,853'Combined type fluid pressure driving apparatus'20036,540,805'High-performance filter for intake air for gas turbine, and filter unit using such filter for intake air for gas turbine'20036,205,857'Angular velocity sensing device'20016,170,330'Angular velocity sensor and angular velocity sensing system'20016,151,964'Angular velocity sensing device'20006,147,936'Electronic watch'20005,970,793'Angular velocity sensor and angular velocity sensing system'19995,835,457'Electronic watch and method of charging the same'19985,798,985'Electronic watch and method of driving the same'19985,777,411'Geared electric motor'19985,637,937'Super-miniature motor'19975,557,168'Gas-discharging type display device and a method of manufacturing'19965,420,548'Quartz crystal oscillator angular velocity detector circuits'19955,105,134'Wiper apparatus interlocking to washer'19924,590,529'Carriage device for moving and positioning magnetic head'19864,584,508'Rain sensor in an automatic wiper drive control system for an automotive vehicle'19864,558,244'Micro stepping motor'19854,480,216'Motor driving circuits'19844,404,510'Electronic timepiece'19834,361,410'Drive system for pulse motor'19824,340,946'Electronic timepiece'19824,283,783'Drive control system for stepping motor'19814,223,522'Electronic timepiece'19804,186,305'High-temperature microscope'19804,179,671'Capacitor switching circuits for adjusting crystal oscillator frequency'19794,158,287'Driver circuit for electro-mechanical transducer'19794,150,536'Electronic timepiece'19794,144,467'Pulse motor'19794,129,981'Electronic timepiece'19784,066,947'Stepping motor for electronic timepiece'19784,055,785'Stepping motor for electronic timepiece'19774,048,548'Stepping motor'19773,958,167'Pulse motor'1976Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1976–2001Patents assigned to CITIZEN WATCH CO LTD (25)· patent assignee history
1976–2001Based in Tokyo, JP· patent location history
1977Patents assigned to MACHIDA TAKAYASU (1)· patent assignee history
1981–1983Based in Tokorozawa, JP· patent location history
1986–2006Patents assigned to JIDOSHA DENKI KOGYO KK (3)· patent assignee history
1986–2006Based in Yokohama, JP· patent location history
1992Patents assigned to JIDOSA DENKI KOGYO K K (1)· patent assignee history
1995–1997Based in Tanashi, JP· patent location history
2008–2009Patents assigned to SONY CORP (2)· patent assignee history
2008–2009Based in Kanagawa, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| CITIZEN WATCH CO LTD | 25 | 1976–2001 |
| JIDOSHA DENKI KOGYO KK | 3 | 1986–2006 |
| SONY CORP | 2 | 2008–2009 |
| JIDOSA DENKI KOGYO K K | 1 | 1992 |
| MACHIDA TAKAYASU | 1 | 1977 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 21 | 1976–2001 |
| Yokohama, JP | 5 | 1986–2006 |
| Kanagawa, JP | 3 | 2008–2009 |
| Tokorozawa, JP | 3 | 1981–1983 |
| Tanashi, JP | 2 | 1995–1997 |