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:
Jun. 14, 2005
Filed:
Mar. 24, 2003
Applicants:
Keiichi Yoshida, Ome, JP;
Shooji Kubono, Akishima, JP;
Inventors:
Keiichi Yoshida, Ome, JP;
Shooji Kubono, Akishima, JP;
Assignees:
Renesas Technology Corp., Tokyo, JP;
Hitachi ULSI Engineering Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C016/04 ;
U.S. Cl.
CPC ...
Abstract
In a nonvolatile semiconductor memory device wherein a plurality of threshold voltages are set so as to store multivalued information in one memory cell, data is first written into the memory cell whose threshold voltage is the lowest as a written state from the erase level, and data is successively written into memory cells whose threshold voltages are higher.