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Expired European patentEurope

Cache invalidate protocol for digital data processing system

EP 0261029 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 September 15, 1987 and granted August 11, 1993. A European patent lasts at most 20 years from filing, so its term ended September 15, 2007.
  • 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 March 15, 2013.
  • 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.
FiledSeptember 15, 1987
PublishedMarch 23, 1988
GrantedAugust 11, 1993
Term endedSeptember 15, 2007
Application numberEP 87402052
Classification (CPC)G06F12/0835

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedSep 15, 1987PublishedMarch 23, 1988Patent grantedAug 11, 1993Term endedSep 15, 2007

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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