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:
Sep. 17, 2002
Filed:
Jul. 10, 2001
Applicant:
Inventor:
Hiroshi Iwahashi, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
A nonvolatile semiconductor memory includes a memory cell string containing a selection transistor and at least one cell transistor which is connected to the selection transistor and has a floating gate. Cell transistors are arranged in a memory cell array. The transistors each have a charge accumulation layer. A potential supply circuit supplies a potential different from a ground potential to gates of the cell transistor at least read operation and when the memory cell array is unselected.