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. 29, 1998
Filed:
Dec. 16, 1996
Applicant:
Inventors:
Kenshiro Arase, Kanagawa, JP;
Koichi Maari, Kanagawa, JP;
Assignee:
Sony Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
257315 ; 257317 ; 257322 ;
Abstract
In a flash type EEPROM device, when a dose amount of an impurity of a floating gate is controlled, or, a channel of a transistor is buried by an ion implantation, the threshold value at no charges accumulated is set between the threshold at writing and the threshold at erasure, to reduce the disturbances of a drain and a gate when reading.