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Inventor

Yasuo Takuma

Inventor
Hitachi, JP

Overview

26→
Patents
1994–2015
Patent span
Physics
Primary field (CPC G)

Patents· 26 as inventor

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

G03Gprimary
G03GElectrography96%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests4%
PatentTitleYear
9,031,471'Development device and image forming apparatus incorporating same'20158,688,012'Developing device and image forming apparatus'20148,682,187'Development device and image forming apparatus incorporating same'20148,666,288'Developing device and image forming apparatus'20148,639,150'Development device and image forming apparatus'20148,615,186'Development device and image forming apparatus incorporating same'20138,515,316'Developing device and image forming apparatus'20137,962,055'Image forming apparatus'20117,796,905'Multicolor image forming apparatus'20107,493,063'Image-forming device comprising a contact charging unit'20097,463,849'Image forming apparatus including static pre-eliminator'20087,158,731'Image forming apparatus with toner concentration controller'20077,142,794'Image forming apparatus'20066,487,384'Image forming electrophotography apparatus and magnetic developing unit'20026,330,414'Developing system having a plurality of developing rollers with opposing magnets of same polarity'20015,923,933'Electrophotographic apparatus'19995,907,755'Developing device'19995,701,570'Image forming apparatus employing residual toner recovery scheme'19975,666,598'Image forming method and apparatus using energy beam impingement on image forming particles to move the same'19975,600,405'Bias cleaning system and electrostatic printing apparatus therewith and operating method thereof'19975,574,546'Developing apparatus for an electrophotographic machine'19965,559,578'Electrostatic recording apparatus with electrified cap and managing system thereof'19965,499,086'Belt type transfer device for electrophotographic apparatus'19965,459,562'Recording apparatus for printing both faces of a recording medium using an electrophotographyprocess'19955,373,351'Electrostatic recording apparatus and managing system thereof'19945,291,253'Corona deterioration and moisture compensation for transfer unit in an electrophotographic apparatus'1994

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1994–2002Patents assigned to HITACHI KOKI KK (11)· patent assignee history
1994–1997Patents assigned to HITACHI LTD (9)· patent assignee history
1994–2009Based in Hitachi, JP· patent location history
1999–2011Based in Ibaraki, JP· patent location history
2011–2015Patents assigned to RICOH CO LTD (8)· patent assignee history
2013–2015Patents assigned to KIKUCHI HIROSHI (7)· patent assignee history
2013–2015Patents assigned to MATSUMOTO JUNICHI (7)· patent assignee history
2013–2015Based in Kanagawa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees
AssigneePatentsSpan
HITACHI KOKI KK111994–2002
HITACHI LTD91994–1997
RICOH CO LTD82011–2015
KIKUCHI HIROSHI72013–2015
MATSUMOTO JUNICHI72013–2015
Locations
LocationPatentsSpan
Hitachi, JP131994–2009
Kanagawa, JP72013–2015
Ibaraki, JP61999–2011