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Expired European patentEurope

Combined read-only and read/write memory and method of accessing the same

EP 0152584 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 December 14, 1984 and granted October 11, 1989. A European patent lasts at most 20 years from filing, so its term ended December 14, 2004.
  • 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 June 14, 2010.
  • 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.
FiledDecember 14, 1984
PublishedAugust 28, 1985
GrantedOctober 11, 1989
Term endedDecember 14, 2004
Application numberEP 84115244
Classification (CPC)G11C7/20 +2 more

Timeline

Timeline From EPO dates

1985198719891991199319951997199920012003Application filedDec 14, 1984PublishedAug 28, 1985Patent grantedOct 11, 1989Term endedDec 14, 2004

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.