The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 26, 2013
Filed:
Oct. 21, 2009
Applicant:
Kazunori Kasuga, Kawasaki, JP;
Inventor:
Kazunori Kasuga, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C 16/04 (2006.01);
U.S. Cl.
CPC ...
Abstract
A nonvolatile semiconductor storage device includes a plurality of cells for storing data on a basis of charges stored nonvolatilly, a write unit for writing and erasing data on the cell by injecting or extracting charges into or from the cell, a comparator for comparing the voltage produced by a selected cell to be read out with a threshold, a read unit for outputting read data on the basis of the comparison result by the comparator, and a threshold update unit for updating the threshold of the comparator according to the voltage produced by the selected cell.