Electrophotography – Image formation – Development
Reexamination Certificate
2006-06-12
2008-08-12
Brase, Sandra L (Department: 2852)
Electrophotography
Image formation
Development
C399S258000
Reexamination Certificate
active
07412190
ABSTRACT:
The present invention provides a developing apparatus and an image forming apparatus which are capable of outputting stable images with no surface staining and toner scattering even when an image forming process is repeated over a long time period, or even when image formation is performed after special use conditions in which little toner is consumed have continued over a long time period. An area in which a relationship of 0.6<Vlocal/Vaverage<0.9, where Vaverage is an average flow speed of a developer during one circuit of a developing container and Vlocal is a local flow speed of the developer as it moves through the developing container, is satisfied exists in the developing container, and a negatively charged toner maintains a relationship of μ0(t)≧μ1(t) between an electrostatic charge distribution peak position μ0(t) of toner in an external force imparting developer and an electrostatic charge distribution peak position μ1(t) of a replenishing toner, this relationship being measured in a deteriorated toner testing method.
REFERENCES:
patent: 5842090 (1998-11-01), Mikawa
patent: 5923930 (1999-07-01), Tsukamoto et al.
patent: 6115576 (2000-09-01), Nakano et al.
patent: 6347212 (2002-02-01), Kosugi et al.
patent: 6421516 (2002-07-01), Kinoshita et al.
patent: 6473585 (2002-10-01), Abe et al.
patent: 6603943 (2003-08-01), Yuuki et al.
patent: 6658227 (2003-12-01), Oyama et al.
patent: 6721532 (2004-04-01), Kosugi et al.
patent: 6757512 (2004-06-01), Miyawaki et al.
patent: 6766132 (2004-07-01), Sakai et al.
patent: 6795676 (2004-09-01), Kikuchi et al.
patent: 6856780 (2005-02-01), Kadota et al.
patent: 6941090 (2005-09-01), Uchida et al.
patent: 6947682 (2005-09-01), Kosugi et al.
patent: 7039344 (2006-05-01), Nishiyama
patent: 2004/0058260 (2004-03-01), Katoh et al.
patent: 2004/0126148 (2004-07-01), Iwai et al.
patent: 2005/0152707 (2005-07-01), Suzuki et al.
patent: 2005/0238380 (2005-10-01), Iijima et al.
patent: 2005/0244194 (2005-11-01), Uchida et al.
patent: 2005/0254846 (2005-11-01), Yura et al.
patent: 2006/0013604 (2006-01-01), Kadota et al.
patent: 2006/0072943 (2006-04-01), Suzuki et al.
patent: 6-3950 (1994-01-01), None
patent: 7-175309 (1995-07-01), None
patent: 9-106161 (1997-04-01), None
patent: 9-197833 (1997-07-01), None
patent: 10-39592 (1998-02-01), None
patent: 10-149007 (1998-06-01), None
patent: 10-198089 (1998-07-01), None
patent: 11-202573 (1999-07-01), None
patent: 11-202627 (1999-07-01), None
patent: 11-231625 (1999-08-01), None
patent: 2001-154471 (2001-06-01), None
patent: 2001-242688 (2001-09-01), None
patent: 2002-365911 (2002-12-01), None
patent: 2003-66698 (2003-03-01), None
patent: 2003-76059 (2003-03-01), None
patent: 2003-149850 (2003-05-01), None
patent: 2003-228189 (2003-08-01), None
patent: 2004-117387 (2004-04-01), None
patent: 2004-272017 (2004-09-01), None
Kadota Ichiro
Kosugi Hideki
Suzuki Kazumi
Uchida Keisuke
Brase Sandra L
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
LandOfFree
Developing apparatus, process cartridge, and image forming... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Developing apparatus, process cartridge, and image forming..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Developing apparatus, process cartridge, and image forming... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4002135