Inventor
SUGIYAMA TOSHIHIRO
JP42 patents
⚠️ This page may combine multiple inventors who share the name “SUGIYAMA TOSHIHIRO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
RICOH KK
34 patentsUS6112046AAug 29, 2000
Image forming apparatus having recycling of residual toner
RICOH KK141 citations97
US6033818AMar 7, 2000
Developing device for an image forming apparatus
RICOH KK53 citations96
US5879752AMar 9, 1999
Method of coating a toner conveyor roller
RICOH KK62 citations96
US5845183ADec 1, 1998
Developing device for an image forming apparatus
RICOH KK52 citations96
US5826144AOct 20, 1998
Developing device for an electrophotographic recording apparatus including bias control of a toner supplying roller
RICOH KK68 citations96
US5768665AJun 16, 1998
Image forming apparatus with bias control to prevent undesirable toner deposition
RICOH KK58 citations96
US5708942AJan 13, 1998
Developing device for an image forming apparatus
RICOH KK53 citations96
US5697026ADec 9, 1997
Developing device having the lengths of two toner transporting rollers and an image bearing member in specific relationships
RICOH KK62 citations96
US5625438AApr 29, 1997
Toner, and devices for electrostatically depositing a uniform application thereof
RICOH KK40 citations96
US5625441AApr 29, 1997
Developing device for an image forming apparatus
RICOH KK54 citations96
US5625440AApr 29, 1997
Developing device having seals between a toner transport roller and the toner hopper which prevent toner leakage and scattering
RICOH KK64 citations96
US5617191AApr 1, 1997
Toner conveyor roller and image forming apparatus having the same
RICOH KK84 citations96
US5489747AFeb 6, 1996
Developing device for an image forming apparatus
RICOH KK73 citations96
US5486909AJan 23, 1996
Developing device for an image forming apparatus
RICOH KK56 citations96
US5666625ASep 9, 1997
Device for electrostatically developing a latent image on an image carrier
RICOH KK62 citations95
US5689782ANov 18, 1997
Developing apparatus for electronic photographic recording equipment, having two developer transfer rollers
RICOH KK64 citations94
US6700595B2Mar 2, 2004
Image forming apparatus with accurate image formation
RICOH KK24 citations93
US5287151AFeb 15, 1994
Developing device for an image forming apparatus using a dry developer
RICOH KK44 citations93
US5897243AApr 27, 1999
Electrophotographic recording apparatus configured to switch a bias voltage in a developing unit
RICOH KK49 citations92
US5552870ASep 3, 1996
Developing device for an image forming apparatus
RICOH KK39 citations92
US5289241AFeb 22, 1994
Developing unit for an image forming apparatus having adjoining fresh and waste toner containers
RICOH KK44 citations92
US5196884AMar 23, 1993
Apparatus having a plurality of replaceable parts
RICOH KK37 citations92
US7817953B2Oct 19, 2010
Image recording medium, sheet feeding device, and image forming apparatus
RICOH KK11 citations84
US7734200B2Jun 8, 2010
Lifetime management device and image forming system
RICOH KK15 citations84
US7676164B2Mar 9, 2010
Lifetime management device and image forming system
RICOH KK13 citations84
US7593652B2Sep 22, 2009
Image forming apparatus and image forming system that calculate operation amount of components thereof
RICOH KK13 citations84
US6895209B2May 17, 2005
Cleaning device and image forming apparatus using the same
RICOH KK15 citations84
US6813467B2Nov 2, 2004
Image forming apparatus
RICOH KK15 citations84
US6961535B2Nov 1, 2005
Image forming apparatus
RICOH KK7 citations74
US6430383B1Aug 6, 2002
Image transferring device and image forming apparatus including the same
RICOH KK10 citations74
US5610693AMar 11, 1997
Developing device for an image forming apparatus
RICOH KK16 citations74
US5223668AJun 29, 1993
Single component developing device with velocity of roller dependent on time constant of circuit formed by resistor layer of developer carrying member and photosensitive drum
RICOH KK18 citations69
US6532355B2Mar 11, 2003
Toner recycling device and method, and image forming apparatus and method using the toner recycling device
RICOH KK4 citations63
US6421511B2Jul 16, 2002
Transfer device and image formation apparatus
RICOH KK5 citations60