Inventor
KOICHI YASUSHI
JP29 patents
⚠️ This page may combine multiple inventors who share the name “KOICHI YASUSHI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
28 patentsUS5387965AFeb 7, 1995
Toner concentration control method
RICOH KK75 citations96
US5327196AJul 5, 1994
Image forming method
RICOH KK83 citations96
US6934484B2Aug 23, 2005
Image-forming apparatus and image-forming method
RICOH KK40 citations93
US7315711B2Jan 1, 2008
Image forming apparatus, process cartridge and cleaningless system
RICOH KK25 citations92
US7273688B2Sep 25, 2007
Image forming method and image forming apparatus for same
RICOH KK15 citations92
US7218879B2May 15, 2007
Image forming apparatus controlling polarity of residual toner and process cartridge for use in the same
RICOH KK39 citations92
US7162187B2Jan 9, 2007
Image forming apparatus and image forming method
RICOH KK25 citations92
US7125638B2Oct 24, 2006
Image forming method and image forming apparatus for same
RICOH KK21 citations92
US6899986B2May 31, 2005
Image forming method and toner for use in the method
RICOH KK28 citations92
US6835517B2Dec 28, 2004
Toner, developer and image forming method using the toner
RICOH KK36 citations92
US5400127AMar 21, 1995
Toner recovery system which detects linear movement of a recovered toner transporter
RICOH KK30 citations92
US5038175AAug 6, 1991
Image density control method
RICOH KK33 citations92
US5006896AApr 9, 1991
Image density control method for an image forming apparatus
RICOH KK37 citations92
US4734737AMar 29, 1988
Control of toner concentration in a developer
RICOH KK38 citations92
US4885466ADec 5, 1989
Corona wire cleaning device utilizing a position detection system
RICOH KK43 citations87
US5049939ASep 17, 1991
Method of controlling image formation in image generating apparatus
RICOH KK21 citations82
US4962394AOct 9, 1990
Toner density control device for an image recorder
RICOH KK22 citations82
US4639117AJan 27, 1987
Recording image density control method for electrophotography
RICOH KK21 citations82
US4279498AJul 21, 1981
Electrostatographic copying apparatus with automatic toner density control
RICOH KK28 citations82
US7515860B2Apr 7, 2009
Image forming method and image forming apparatus for same
RICOH KK4 citations74
US7150954B2Dec 19, 2006
Image forming method and toner for use in the method
RICOH KK10 citations74
US5508787AApr 16, 1996
Method and apparatus for controlling process condition for image formation
RICOH KK18 citations74
US4551005ANov 5, 1985
Method of forming images of sensor patterns in effecting image density control of electrophotographic copying apparatus
RICOH KK18 citations74
US4522481AJun 11, 1985
Toner supply control method for electrophotographic copier
RICOH KK15 citations74
US4885612ADec 5, 1989
Cleaning device for an image forming apparatus
RICOH KK16 citations72
US7548349B2Jun 16, 2009
Image forming apparatus to prevent toner deformation
RICOH KK4 citations63
US7499664B2Mar 3, 2009
Image processing apparatus, process cartridge, and cleaning system with residual toner retaining unit
RICOH KK5 citations63
US7639957B2Dec 29, 2009
Image forming apparatus including controller to detect condition of image developer
RICOH KK5 citations62