A developing apparatus in which a first magnet of a first developing sleeve includes a first magnetic pole near a potion opposing to an image bearing member, and a second magnetic pole being downstream of the first magnetic pole; and a second magnet of a second developing sleeve includes a third magnetic...http://www.google.es/patents/US20070053724?utm_source=gb-gplus-sharePatente US20070053724 - Developing apparatus
Número de solicitud: 11/499,731 Número de publicación: US 2007/0053724 A1 Fecha de presentación: 7 Ago 2006 Patente emitida: US7653336 ( Fecha de emisión 26 Ene 2010)
