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. 19, 2006
Filed:
Aug. 04, 2003
Applicants:
Katsuki Nagahashi, Osaka, JP;
Atsushi Noma, Osaka, JP;
Inventors:
Katsuki Nagahashi, Osaka, JP;
Atsushi Noma, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 29/00 (2006.01); G01R 31/28 (2006.01);
U.S. Cl.
CPC ...
Abstract
An accelerated test method evaluates, under accelerated conditions (a temperature Tand a voltage V), an endurance characteristic of a ferroelectric memory device having a capacitor element including a ferroelectric film under actual operating conditions (a temperature Tand a voltage V). An acceleration factor (K) required to evaluate the endurance characteristic is derived by using an expression: logK=A(1/V−1/V)+B(1/VT−1/VT) (where each of A and B is a constant).