A nonvolatile semiconductor memory device having nonvolatile memory cells, each of said memory cells including a semiconductor substrate of one type of electric conduction, a pair of source and drain regions of the opposite type of electric conduction formed in the semiconductor substrate, an electric...http://www.google.es/patents/US20030071302?utm_source=gb-gplus-sharePatente US20030071302 - Multi-level type nonvolatile semiconductor memory device
Multi-level type nonvolatile semiconductor memory device
Número de solicitud: 10/303,726 Número de publicación: US 2003/0071302 A1 Fecha de presentación: 26 Nov 2002 Patente emitida: US6605839 ( Fecha de emisión 12 Ago 2003)
