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Expired European patentEurope

System and method for consistent timestamping in distributed computer databases

EP 0458564 B1 · Applicant: DIGITAL EQUIPMENT 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 May 20, 1991 and granted July 1, 1998. A European patent lasts at most 20 years from filing, so its term ended May 20, 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 November 20, 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.
FiledMay 20, 1991
PublishedNovember 27, 1991
GrantedJuly 1, 1998
Term endedMay 20, 2011
Application numberEP 91304534
Classification (CPC)G06F16/219 +1 more

Timeline

Timeline From EPO dates

1992199419961998200020022004200620082010Application filedMay 20, 1991PublishedNov 27, 1991Patent grantedJuly 1, 1998Term endedMay 20, 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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