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:
Mar. 23, 1993
Filed:
Feb. 04, 1991
Applicant:
Inventors:
Noboru Moriuchi, Tokyo, JP;
Yoshiki Yamaguchi, Tokyo, JP;
Toshihiko Tanaka, Tokyo, JP;
Norio Hasegawa, Hinode, JP;
Yoshifumi Kawamoto, Kanagawa, JP;
Shin-ichiro Kimura, Hachioji, JP;
Toru Kaga, Urawa, JP;
Tokuo Kure, Kokubunji, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 236 ; 357 42 ; 357 45 ;
Abstract
A semiconductor memory wherein a memory cell region having a plurality of memory cells and a relatively high altitude above the surface of semiconductor substrate is formed at a recessed part of the semiconductor substrate having the recessed part and a projected part, and wherein a peripheral circuit region having a comparatively low altitude from the surface of the semiconductor substrate is formed at the projected part of the semiconductor substrate.