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Expired European patentEurope

Monolithic integrated memory arrangement with I2L memory cells

EP 0028306 B1 · Applicant: International Business Machines Corporation

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Overview

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Listed from its EPO record in Patent Yard's archive of European patents past their term. Its claims, description and drawings are in the EPO PDF and on Google Patents, and the Claude kit works from them.

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Why it's free to use

  • Filed September 15, 1980 and granted May 18, 1983. A European patent lasts at most 20 years from filing, so its term ended September 15, 2000.
  • A supplementary protection certificate, which can extend a medicine or crop-protection patent, adds at most five and a half years, so even that would have ended by March 15, 2006.
  • We check European rights only. A US or other national patent in its family could still be in force: check its family on Espacenet or Google Patents.
FiledSeptember 15, 1980
PublishedMay 13, 1981
GrantedMay 18, 1983
Term endedSeptember 15, 2000
Application numberEP 80105501
Classification (CPC)G11C5/063 +2 more

Timeline

Timeline From EPO dates

1981198319851987198919911993199519971999Application filedSep 15, 1980PublishedMay 13, 1981Patent grantedMay 18, 1983Term endedSep 15, 2000

Sources & verification

Official EPO records

Full published documentClaims, description and drawings as a PDF.EPOEuropean Patent RegisterProcedure, status, file inspection and legal events.EPOLinked open EP data recordThe bibliographic record this page is built from.EPO

Cross-check elsewhere

Google PatentsFull text, worldwide family, citing patents and legal events.patents.google.comEspacenetNational family members and their legal status.European Patent Office

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.