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Expired European patentEurope

Data processing system and method with small fully-associative cache and prefetch buffers

EP 0449540 B1 · Applicant: DIGITAL EQUIPMENT 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 March 25, 1991 and granted May 17, 2000. A European patent lasts at most 20 years from filing, so its term ended March 25, 2011.
  • 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 September 25, 2016.
  • 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.
FiledMarch 25, 1991
PublishedOctober 2, 1991
GrantedMay 17, 2000
Term endedMarch 25, 2011
Application numberEP 91302555
Classification (CPC)G06F12/0862

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMarch 25, 1991PublishedOct 2, 1991Patent grantedMay 17, 2000Term endedMarch 25, 2011

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.