IP Library › Granted Patent US 5,978,255
Granted Patent Utility
US 5,978,255 · App. 09/157,365

Semiconductor memory device stably storing multiple-valued data without a decrease in operation margin

Inventor: Isao Naritake
Patented Case View Patent ↗
Granted: Nov 2, 1999 Filed: Sep 21, 1998
Inventor
Isao Naritake
Assignee (at issue)
NEC CORPORATION

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.

Order Certified Copies
Most orders are placed with the USPTO same day — all within 24 business hours.
Order via The Patent Place →
Pre-filled with this patent's details
Quick Facts
Patent No.
US 5,978,255
App. No.
09/157,365
Filed
1998-09-21
Granted
1999-11-02
Kind
A