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Expired European patentEurope

A method for clearing unlocking key codes in an electronic locking device

EP 0246903 B1 · Applicant: UNISAFE LIMITED

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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 May 21, 1987 and granted April 15, 1992. A European patent lasts at most 20 years from filing, so its term ended May 21, 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 November 21, 2012.
  • 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 21, 1987
PublishedNovember 25, 1987
GrantedApril 15, 1992
Term endedMay 21, 2007
Application numberEP 87304541
Classification (CPC)G07C9/00722

Timeline

Timeline From EPO dates

1988199019921994199619982000200220042006Application filedMay 21, 1987PublishedNov 25, 1987Patent grantedApril 15, 1992Term endedMay 21, 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

Everything on this page comes from the EPO record linked above. EPO data used under CC BY 4.0.