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:
Jul. 10, 2001
Filed:
Nov. 08, 1999
Hiromi Nobukata, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A nonvolatile semiconductor storage device is disclosed. The device has memory cells for storing data corresponding to threshold voltages that vary corresponding to the amount of electric charge stored in electric charge storing portions, the amount of electric charge varying corresponding to voltages supplied to word lines and bit lines, multi-value data of n bits (where n≧2) being written in parallel and page by page to the memory cells. The device comprises a write controlling means for supplying a voltage for word lines as a pulse signal to memory cells and controlling the pulse width of the effective voltage of word lines corresponding to a substantial write time period of data written to the memory cells.