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:
Apr. 01, 2008
Filed:
Jan. 31, 2007
Applicants:
Jai-hyuk Song, Seoul, KR;
Jeong-hyuk Choi, Seongnam-si, KR;
Ok-cheon Hong, Yongin-si, KR;
Inventors:
Assignee:
Samsung Electronics Co., Ltd., Suwon-si, Gyeonggi-do, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 29/788 (2006.01); H01L 21/8239 (2006.01); G11C 16/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A flash memory device includes a cell string having a plurality of cell transistors connected in series, and a string selection transistor and a ground selection transistor connected to both ends of the cell string, respectively, wherein the cell transistor has a channel impurity concentration higher than a channel impurity concentration of at least one of the string selection transistor and the ground selection transistor.