Inventor
Tatsuo Igawa
Inventor
Kitaibaraki, JP
Overview
Patents· 24 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G02Fprimary
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein22%
G03GElectrography19%
G06KGraphical data reading14%
B41JTypewriters11%
F02PIgnition, other than compression ignition, for internal-combustion engines8%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests8%
G09GArrangements or circuits for control of indicating devices using static means to present variable information6%
C09KMaterials for miscellaneous applications, not provided for elsewhere3%
G01RMeasuring electric variables3%
G02BOptical elements, systems or apparatus3%
PatentTitleYear
6,604,816'Ink-jet recording head and ink-jet recorder'20036,557,981'Ink jet recorder'20036,443,560'Recording head and inkjet recording device having separately arranged ink chambers and ink discharge unit'20025,860,049'Developing apparatus and picture image forming apparatus'19995,832,350'Developing apparatus and color electrophotographic apparatus using the same'19985,574,546'Developing apparatus for an electrophotographic machine'19965,559,578'Electrostatic recording apparatus with electrified cap and managing system thereof'19965,373,351'Electrostatic recording apparatus and managing system thereof'19945,321,477'Image forming apparatus capable of preventing the winding on the image carrier'19945,252,954'Multiplexed driving method for an electrooptical device, and circuit therefor'19935,177,531'Electrostatic recorder and electrostatic latent image measuring instrument'19935,095,376'Apparatus and method for driving an optical printer having a liquid crystal optical switch'19924,783,149'Time-sharing drive liquid crystal optical switch array and optical printer using this optical switch array'19884,769,659'Printer utilizing optical switch elements'19884,746,196'Multiplexed driving method for an optical switching element employing ferroelectric liquid crystal'19884,712,876'Driving ferroelectric liquid crystal printers via short circuiting'19874,591,886'Driving method and apparatus for optical printer with liquid-crystal switching element'19864,586,790'Display panel having uniaxially-stretched organic polymer film as the substrate'19864,505,546'Liquid crystal display device'19854,468,543'Ignition distributor'19844,362,771'Liquid crystal display element with gap controlling material and process for production thereof'19824,345,120'Distributor'19824,219,707'Distributor with coated alkaline earth oxide electrode'19804,145,101'Method for manufacturing gas insulated electrical apparatus'1979Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1979–2003Patents assigned to HITACHI LTD (22)· patent assignee history
1979–2003Based in Kitaibaraki, JP· patent location history
1980–1984Patents assigned to NISSAN MOTOR (3)· patent assignee history
1984Based in Kitaibaragi, JP· patent location history
1988Patents assigned to HORI YASURO (1)· patent assignee history
1988Patents assigned to IGAWA TATSUO (1)· patent assignee history
1988Based in Ibaraki-shi, JP· patent location history
1993–2002Based in Ibaraki, JP· patent location history
1994–1998Patents assigned to HITACHI KOKI KK (5)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| HITACHI LTD | 22 | 1979–2003 |
| HITACHI KOKI KK | 5 | 1994–1998 |
| NISSAN MOTOR | 3 | 1980–1984 |
| HORI YASURO | 1 | 1988 |
| IGAWA TATSUOself | 1 | 1988 |
Locations
| Location | Patents | Span |
|---|---|---|
| Kitaibaraki, JP | 20 | 1979–2003 |
| Ibaraki, JP | 2 | 1993–2002 |
| Ibaraki-shi, JP | 1 | 1988 |
| Kitaibaragi, JP | 1 | 1984 |