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Expired European patentEurope

Portable, batteryless, frequency divider consisting of inductor and diode

EP 0246301 B1 · Applicant: Security Tag Systems, Inc.

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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 November 3, 1986 and granted July 3, 1991. A European patent lasts at most 20 years from filing, so its term ended November 3, 2006.
  • 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 May 3, 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.
FiledNovember 3, 1986
PublishedNovember 25, 1987
GrantedJuly 3, 1991
Term endedNovember 3, 2006
Application numberEP 86907137
Classification (CPC)G08B13/2425 +1 more

Timeline

Timeline From EPO dates

1987198919911993199519971999200120032005Application filedNov 3, 1986PublishedNov 25, 1987Patent grantedJuly 3, 1991Term endedNov 3, 2006

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.