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. 11, 1993
Filed:
Jul. 23, 1990
Applicant:
Inventor:
Ryoji Takada, Tokyo, JP;
Assignee:
Seiko Instruments Inc., , JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ; G11C / ; G11C / ; G11C / ;
U.S. Cl.
CPC ...
365200 ; 365185 ; 371 101 ; 371 214 ;
Abstract
The memory device is comprised of a plurality of memory arrays. Firstly, one of the memory arrays is selected for operation. When the selected one reaches an operational limit due to repetition of data rewriting which causes degradation of writing performance, another memory array is then selected for subsequent operation to thereby improve performance of the semiconductor nonvolatile memory device.