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:
Aug. 23, 1977
Filed:
May. 12, 1976
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ; G11C / ;
U.S. Cl.
CPC ...
3401 / ; 3401 / ;
Abstract
In a MIS dynamic memory, information is written in the memory cell at a predetermined address, the access to other plural addresses is made for a fixed time period under such a condition that the memory cell of the predetermined address is not refreshed, and the stored information is thereafter read out of the memory cell of the predetermined address. The level of the read information is compared with a predetermined threshold value, thereby determining the information hold time of the memory cell.