Inventor
TAKUMA YASUO
JP26 patents
⚠️ This page may combine multiple inventors who share the name “TAKUMA YASUO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HITACHI LTD
9 patentsUS5666598ASep 9, 1997
Image forming method and apparatus using energy beam impingement on image forming particles to move the same
HITACHI LTD24 citations92
US5600405AFeb 4, 1997
Bias cleaning system and electrostatic printing apparatus therewith and operating method thereof
HITACHI LTD46 citations92
US5499086AMar 12, 1996
Belt type transfer device for electrophotographic apparatus
HITACHI LTD24 citations92
US5291253AMar 1, 1994
Corona deterioration and moisture compensation for transfer unit in an electrophotographic apparatus
HITACHI LTD49 citations92
US5701570ADec 23, 1997
Image forming apparatus employing residual toner recovery scheme
HITACHI LTD15 citations73
US5559578ASep 24, 1996
Electrostatic recording apparatus with electrified cap and managing system thereof
HITACHI LTD12 citations73
US5459562AOct 17, 1995
Recording apparatus for printing both faces of a recording medium using an electrophotographyprocess
HITACHI LTD16 citations72
US5373351ADec 13, 1994
Electrostatic recording apparatus and managing system thereof
HITACHI LTD5 citations63
US5574546ANov 12, 1996
Developing apparatus for an electrophotographic machine
HITACHI LTD5 citations62
HITACHI KOKI KK
4 patentsUS5923933AJul 13, 1999
Electrophotographic apparatus
HITACHI KOKI KK49 citations92
US6330414B1Dec 11, 2001
Developing system having a plurality of developing rollers with opposing magnets of same polarity
HITACHI KOKI KK14 citations71
US6487384B2Nov 26, 2002
Image forming electrophotography apparatus and magnetic developing unit
HITACHI KOKI KK4 citations63
US5907755AMay 25, 1999
Developing device
HITACHI KOKI KK6 citations63
RICOH PRINTING SYS LTD
3 patentsUS7463849B2Dec 9, 2008
Image forming apparatus including static pre-eliminator
RICOH PRINTING SYS LTD6 citations63
US7142794B2Nov 28, 2006
Image forming apparatus
RICOH PRINTING SYS LTD5 citations63
US7158731B2Jan 2, 2007
Image forming apparatus with toner concentration controller
RICOH PRINTING SYS LTD2 citations60