Granted Patent
Utility
US 6,657,891 · App. 10/358,643
Semiconductor memory device for storing multivalued data
Inventors:
Noboru Shibata, Tomoharu Tanaka
Patented Case
View Patent ↗
Granted: Dec 2, 2003
Filed: Feb 4, 2003
Inventors
Noboru Shibata
Tomoharu Tanaka
Assignee (at issue)
Kabushiki Kaisha Toshiba
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.