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Expired European patentEurope

Storage array having DC stable conductivity modulated storage cells

EP 0043004 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 June 10, 1981 and granted April 5, 1989. A European patent lasts at most 20 years from filing, so its term ended June 10, 2001.
  • 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 December 10, 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.
FiledJune 10, 1981
PublishedJanuary 6, 1982
GrantedApril 5, 1989
Term endedJune 10, 2001
Application numberEP 81104437
Classification (CPC)G11C11/39

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedJune 10, 1981PublishedJan 6, 1982Patent grantedApril 5, 1989Term endedJune 10, 2001

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.