Granted Patent
Utility
US 6,643,188 · App. 10/051,372
Non-volatile semiconductor memory device adapted to store a multi-valued data in a single memory cell
Inventors:
Tomoharu Tanaka, Jian Chen
Patented Case
View Patent ↗
Granted: Nov 4, 2003
Filed: Jan 22, 2002
Inventors
Tomoharu Tanaka
Jian Chen
Assignees (at issue)
Kabushiki Kaisha Toshiba
Sandisk, Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.