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. 09, 1983
Filed:
Jul. 23, 1981
Applicant:
Inventors:
Raymond C Hedin, Apple Valley, MN (US);
Dennis L Amundson, Bloomington, MN (US);
Assignee:
Sperry Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365195 ; 365184 ;
Abstract
Apparatus for preventing the writing of data into an MNOS memory during various time intervals, whereby the over-writing and premature fatiguing of the differential voltage separation of the memory cells is prevented. The apparatus comprising an access memory that flags each address when it is first written during a write protect interval so that upon subsequent attempts to write the same address a write abort will occur.