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Expired European patentEurope

File lock management in a distributed data processing system

EP 0398495 B1 · Applicant: International Business Machines Corporation

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Overview

The published document from the EPO: abstract, claims, description and drawings. Open it full size

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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 April 10, 1990 and granted January 22, 1997. A European patent lasts at most 20 years from filing, so its term ended April 10, 2010.
  • 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 October 10, 2015.
  • 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.
FiledApril 10, 1990
PublishedNovember 22, 1990
GrantedJanuary 22, 1997
Term endedApril 10, 2010
Application numberEP 90303885
Classification (CPC)G06F16/182 +1 more

Timeline

Timeline From EPO dates

1991199319951997199920012003200520072009Application filedApril 10, 1990PublishedNov 22, 1990Patent grantedJan 22, 1997Term endedApril 10, 2010

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.