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:
Jan. 28, 2003
Filed:
Aug. 06, 2001
Junichi Ogane, Tokyo, JP;
Abstract
A nonvolatile semiconductor memory device comprising a plurality of memory cells each having a transistor including a floating gate electrode as a constituent are arranged on a silicon substrate in a matrix, wherein bit lines have hierarchical structures and comprise at least a main bit line and a sub-bit line , and a plurality of sub-bit line selection transistors provided between the main bit line and sub-bit line which transistor are respectively selectively activated depending on given row address lines, wherein a voltage applied to each gate electrode of the sub-bit line selection transistor which is selected and activated when data is erased from or written on each memory cell is rendered the same as that applied to each gate electrode of the sub-bit line selection transistor which becomes non-activated when not selected.