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:
Dec. 02, 2008
Filed:
Jul. 14, 2006
Akira Yoshino, Kanagawa, JP;
Akira Yoshino, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
Data is written to a nonvolatile memory device having a memory region of four bits or larger in one memory cell sandwiched by a source and a drain with an improved accuracy. The nonvolatile memory deviceincludes four control gatestoprovided between a first and a second impurity-diffused regionsandthat are provided separately from the semiconductor substrate, and a memory cell including memory regionstothat are counterpart of the control gates. A method for controlling the nonvolatile memory deviceincludes classifying the four control gatestointo two groups of right and left sides, and then, applying a lower voltage to an impurity-diffused region that is further from a target memory region for injecting an electron and applying a higher voltage to an impurity-diffused region that is closer the target memory region, and moreover applying a higher voltage, the higher voltage being higher than voltages applied to other control gates.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile