Inventor
MARUTA TAKAYUKI
JP25 patents
⚠️ This page may combine multiple inventors who share the name “MARUTA TAKAYUKI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
23 patentsUS5860038AJan 12, 1999
Apparatus and method for detecting developing ability of an image forming apparatus
RICOH KK91 citations98
US6226481B1May 1, 2001
Image forming apparatus with control over developing unit during an idle running of an intermediate image transfer body
RICOH KK57 citations96
US6055386AApr 25, 2000
Apparatus and method for detecting developing ability of an image forming apparatus with varied LED continuous lighting time for image forming and process control modes
RICOH KK60 citations96
US5826146AOct 20, 1998
Color image forming device which changes developing bias when switching between developer units
RICOH KK49 citations96
US5671470ASep 23, 1997
Color image forming device which changes developing bias when switching between developer units
RICOH KK53 citations96
US5270783ADec 14, 1993
Image forming equipment having improved toner sensing
RICOH KK66 citations95
US4916547AApr 10, 1990
Color image forming apparatus
RICOH KK90 citations95
US5384628AJan 24, 1995
Developing device for image forming equipment
RICOH KK67 citations94
US5227842AJul 13, 1993
Electrophotographic image forming apparatus which controls developer bias based on image irregularity
RICOH KK62 citations94
US7174124B2Feb 6, 2007
Tandem color image forming apparatus with an image transfer belt and backup roller
RICOH KK25 citations92
US6823149B2Nov 23, 2004
Image forming apparatus with variable speed transferring and fixing devices
RICOH KK43 citations92
US5835825ANov 10, 1998
Color image forming device having a revolver developing unit
RICOH KK28 citations92
US5724634AMar 3, 1998
Image forming device in which developer roller speed is controlled in developer transfer to a photoconductive drum
RICOH KK26 citations92
US5298944AMar 29, 1994
Testing image density to control toner concentration and dynamic range in a digital copier
RICOH KK32 citations92
US5293198AMar 8, 1994
Image forming apparatus for controlling the dynamic range of an image
RICOH KK24 citations92
US5237369AAug 17, 1993
Color image forming equipment responsive to changes in ambient conditions
RICOH KK22 citations92
US6160569ADec 12, 2000
Image forming apparatus capable of changing process line speed
RICOH KK72 citations91
US5881334AMar 9, 1999
Image forming apparatus and method for preventing wasted toner
RICOH KK20 citations86
US6535707B2Mar 18, 2003
Image forming system
RICOH KK15 citations84
US7474867B2Jan 6, 2009
Magnetic carrier, two-component developer, development method, development device and image forming apparatus of electrophotography
RICOH KK8 citations83
US7139512B2Nov 21, 2006
Charging device, process cartridge and image forming apparatus
RICOH KK8 citations72
US7139517B2Nov 21, 2006
Developing method for an image forming apparatus and developing device using the same
RICOH KK3 citations63
US7161712B2Jan 9, 2007
Apparatus for forming images with proper gamma correction
RICOH KK6 citations54