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Expired European patentEurope

Method for conditional deletion of data objects within a data processing system

EP 0458720 B1 · Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION

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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 30, 1991 and granted July 16, 1997. A European patent lasts at most 20 years from filing, so its term ended April 30, 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 October 30, 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.
FiledApril 30, 1991
PublishedNovember 27, 1991
GrantedJuly 16, 1997
Term endedApril 30, 2011
Application numberEP 91480072
Classification (CPC)G06F16/93

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedApril 30, 1991PublishedNov 27, 1991Patent grantedJuly 16, 1997Term endedApril 30, 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

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