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. 12, 1989
Filed:
Mar. 04, 1988
Applicant:
Inventors:
Masahiro Yoneda, Hyogo, JP;
Masahiro Hatanaka, Hyogo, JP;
Yoshio Kohno, Hyogo, JP;
Shinichi Satoh, Hyogo, JP;
Hidekazu Oda, Hyogo, JP;
Koichi Moriizumi, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 236 ; 357 41 ; 357 24 ; 365 53 ; 365149 ;
Abstract
A semiconductor memory device comprises four memory cells (4a, 6) arranged in point symmetry on a semiconductor substrate (1), and an insulating layer (10) covering the memory cells and having one contact hole (2) placed in the center of the point symmetry, with the contact hole enabling electrical connection to each of the memory cells.