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:
Mar. 22, 1994
Filed:
Sep. 10, 1992
Applicant:
Inventors:
Toshiya Sato, Tokyo, JP;
Kazuhisa Ninomiya, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365218 ; 365236 ; 365185 ; 36518909 ; 36518911 ;
Abstract
When an electrically erasable and program read only memory device enters an erasing mode of operation, electrons are evacuated from floating gate electrodes of the floating gate type field effect transistors serving as memory cells, and the evacuation is continued over a time period instructed from an internal memory circuit so that the memory cells are prevented from depletion mode due to excess evacuation as well as from non-erased state due to insufficient evacuation.