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Expired European patentEurope

Thrashing reduction in demand accessing of a data base through an lru paging buffer pool

EP 0085672 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 August 18, 1981 and granted February 1, 1989. A European patent lasts at most 20 years from filing, so its term ended August 18, 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 February 18, 2007.
  • 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.
FiledAugust 18, 1981
PublishedAugust 17, 1983
GrantedFebruary 1, 1989
Term endedAugust 18, 2001
Application numberEP 81902361
Classification (CPC)G06F12/123

Timeline

Timeline From EPO dates

1982198419861988199019921994199619982000Application filedAug 18, 1981PublishedAug 17, 1983Patent grantedFeb 1, 1989Term endedAug 18, 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.