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. 13, 2007
Filed:
Jan. 07, 2004
Applicant:
Akira Maruyama, Yokohama, JP;
Inventor:
Akira Maruyama, Yokohama, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G 3/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A ferroelectric memory device capable of structurally reducing data deterioration. In this ferroelectric memory device, bitlines are hierarchized, and sub-bitlines subordinate to the bitlines through sub-bitline select switches are provided in each of a plurality of block regions. The block regions are sequentially selected along an increment direction, and wordlines in each block are sequentially selected along the increment direction from the lowest wordline to the highest wordline. The number 'n' of wordlines arranged in each block region is set equal to or less than a predetermined limit number about relaxation.