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:
May. 24, 1994
Filed:
Feb. 07, 1991
Kazutoshi Hirayama, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor memory device having a redundant circuit for electrically replacing a defective memory cell column with a spare memory cell column. An electric fuse (25) is connected between a precharging voltage line (V.sub.BL) and bit lines (BL, BL). When a defective memory cell exists, the precharging voltage tries to vary through this fuse. However, this fuse is cut off, so that the precharging voltage is prevented from varying. Accordingly, data stored in the remaining memory cells are read out correctly and without delay.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile