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:
Feb. 13, 1990
Filed:
Aug. 31, 1988
Applicant:
Inventors:
Kikuzo Sawada, Tokyo, JP;
Kouzi Tanagawa, Tokyo, JP;
Nobuhiro Tomari, Tokyo, JP;
Tomoaki Yoshida, Tokyo, JP;
Assignee:
Oki Electric Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F / ;
U.S. Cl.
CPC ...
371 511 ; 371 13 ; 371 691 ;
Abstract
In a nonvolatile memory device or a microcomputer with a nonvolatile memory, data errors arising from loss of charge in the floating gates of memory cells are detected and corrected by applying two different sense voltages to the memory cells and comparing the outputs. Instead of using a cumbersome error-correcting code, this error-correcting scheme requires only one parity bit per word, yet it can detect and correct errors in any odd number of bits. Benefits include reduced chip size and longer life for electrically erasable and programmable memories.