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Expired European patentEurope

A hierarchical memory system including separate cache memories for storing data and instructions

EP 0115036 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 21, 1983 and granted February 27, 1991. A European patent lasts at most 20 years from filing, so its term ended December 21, 2003.
  • 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 21, 2009.
  • 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 21, 1983
PublishedAugust 8, 1984
GrantedFebruary 27, 1991
Term endedDecember 21, 2003
Application numberEP 83112890
Classification (CPC)G06F12/0888 +2 more

Timeline

Timeline From EPO dates

1984198619881990199219941996199820002002Application filedDec 21, 1983PublishedAug 8, 1984Patent grantedFeb 27, 1991Term endedDec 21, 2003

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

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