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. 26, 2001
Filed:
Nov. 24, 1999
Applicant:
Inventor:
Tetsuya Chida, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C 1/604 ;
U.S. Cl.
CPC ...
G11C 1/604 ;
Abstract
A semiconductor memory device which can quickly and certainly read out block valid/invalid information is provided. This semiconductor memory device includes a memory cell array having memory cells arranged in rows and columns, and a valid/invalid information storage unit which stores valid/invalid information of the respective memory cells. The valid/invalid information storage unit is disposed outside the memory cell array.